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How to install uTorrent on Ubuntu 16.04

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Install uTorrent on Ubuntu 16.04 
µTorrent, or uTorrent (see pronunciation) is a freeware, ad-supported, proprietary BitTorrent client owned and developed by BitTorrent, Inc. With over 100 million users it is the most widely used BitTorrent client outside China; globally only behind Xunlei.The "µ" (Greek letter "mu") in its name comes from the SI prefix "micro-", referring to the program's small memory footprint: the program was designed to use minimal  
 
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computer resources while offering functionality comparable to larger BitTorrent clients such as Vuze or BitComet. The program has received consistently good reviews for its feature set, performance, stability, and support for older hardware and versions of Windows. 
INSTALLATION  
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">$ sudo apt-get update
$ sudo apt-get install libssl1.0.0 libssl-dev</pre>
<a href="http://www.utorrent.com/downloads/linux" target="_blank">Download the Latest version</a> of the uTorrent server from the official website or simply enter the following command to download the current version. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">### 32 bit ###

$ wget http://download-new.utorrent.com/endpoint/utserver/os/linux-i386-ubuntu-13-04/track/beta/ -O utserver.tar.gz

### 64 bit ###

$ wget http://download-new.utorrent.com/endpoint/utserver/os/linux-x64-ubuntu-13-04/track/beta/ -O utserver.tar.gz</pre>
Once you have downloaded, extract the file into /opt directory 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; float: none !important; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">$ sudo tar -zxvf utserver.tar.gz -C /opt/</pre>
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Set an executable permission to the extracted directory for running the uTorrent Server.</div>
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<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">$ sudo chmod 777 /opt/utorrent-server-alpha-v3_3/</pre>
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Link uTorrent Server to /usr/bin/ directory. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">$ sudo ln -s /opt/utorrent-server-alpha-v3_3/utserver /usr/bin/utserver</pre>
Start uTorrent Server by executing the following command. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">$ utserver -settingspath /opt/utorrent-server-alpha-v3_3/ &</pre>
Once you run the command, navigate your web browser to the following address. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); clear: none !important; color: white; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; outline: 0px; overflow: auto; padding: 10px !important; vertical-align: baseline; width: auto !important; word-break: break-all;">http://your-ip-address:8080/gui</pre>
Username is admin and leave the password field empty. 
 
Once you have logged in, set the download directory. To do that, click on Settings (Gear Icon) –> Directories –>  Put new downloads in —> mention the directory –> Save settings. 
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How to install uTorrent on Ubuntu 16.04

Install uTorrent on Ubuntu 16.04 µTorrent, or uTorrent (see pronunciation) is a freeware, ad-supported, proprietary BitTorrent client owne...

How to install and setup Icinga Monitoring Tool on CentOS 7 / RHEL 7

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Setup Icinga Monitoring Tool on CentOS 7 / RHEL 7 
Icinga is an open source computer system and network monitoring application. It was originally created as a fork of the Nagios system monitoring application in 2009. 
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Icinga is attempting to get past perceived short-comings in Nagios' development process, as well as adding new features such as a modern Web 2.0 style user interface, additional database connectors (for MySQL, Oracle, and PostgreSQL), and a REST API that lets administrators integrate numerous extensions without complicated modification of the Icinga core. 
Before we go ahead, lets install the required packages for Icinga. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># yum -y install wget httpd mod_ssl gd gd-devel mariadb-server php-mysql php-xmlrpc gcc mariadb libdbi libdbi-devel libdbi-drivers libdbi-dbd-mysql</pre>
Disable SELinux. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config</pre>
Reboot once done. 
 
Create icinga user and icinga-cmd group (allowing the external commands to be executed through the web interface) , add  icinga and apache user to the part of icinga-cmd group. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># useradd icinga
# groupadd icinga-cmd
# usermod -a -G icinga-cmd icinga
# usermod -a -G icinga-cmd apache</pre>
Download latest Icinga source tarball. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># cd /tmp/
# wget http://downloads.sourceforge.net/project/icinga/icinga/1.10.1/icinga-1.10.1.tar.gz
# tar -zxvf /tmp/icinga-1.10.1.tar.gz
# cd /tmp/icinga-1.10.1</pre>
Compile and Install Icinga: 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># ./configure --with-command-group=icinga-cmd --enable-idoutils
# make all
# make install
# make install-init
# make install-config
# make install-commandmode
# make install-webconf
# make install-idoutils</pre>
Configure Icinga: 
 
Sample configuration files have now been installed in the /usr/local/icinga/etc/ directory. These sample files should work fine for getting started with Icinga. You’ll need to make just one change before you proceed. Edit the /usr/local/icinga/etc/objects/contacts.cfg config file with your favorite editor and change the email address associated with the nagiosadmin contact definition to the address you’d like to use for receiving alerts. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># vi /usr/local/icinga/etc/objects/contacts.cfg</pre>
Change the Email address field to receive the notification. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">email icinga@localhost</pre>
to 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">email icinga@hackthesec.co.in</pre>
Move sample idoutils configuration files to Icinga base directory. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># cd /usr/local/icinga/etc/
# mv idomod.cfg-sample idomod.cfg
# mv ido2db.cfg-sample ido2db.cfg
# cd modules/
# mv idoutils.cfg-sample idoutils.cfg</pre>
Create database for idoutils: 
 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;"># systemctl start mariadb.service
# mysql -u root -p
MariaDB [(none)]> CREATE DATABASE icinga;
MariaDB [(none)]> GRANT USAGE ON icinga.* TO 'icinga'@'localhost' IDENTIFIED BY 'icinga' WITH MAX_QUERIES_PER_HOUR 0 MAX_CONNECTIONS_PER_HOUR 0 MAX_UPDATES_PER_HOUR 0;
MariaDB [(none)]> FLUSH PRIVILEGES;
MariaDB [(none)]> quit</pre>
Import Database. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># mysql -u root -p icinga < /tmp/icinga 1.10.1/module/idoutils/db/mysql/mysql.sql</pre>
Configure Web Interface: 
 
Create a icingaadmin account for logging into the Icinga web interface. Remember the password that you assign to this user – you’ll need it later. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># htpasswd -c /usr/local/icinga/etc/htpasswd.users icingaadmin</pre>
Restart Apache to make the new settings take effect. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">systemctl restart httpd.service</pre>
Download and Install Nagios Plugins: 
 
Download Nagios Plugins to /tmp directory. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># cd /tmp
# wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz
# tar -zxvf /tmp/nagios-plugins-2.0.3.tar.gz
# cd /tmp/nagios-plugins-2.0.3/</pre>
Compile and install the plugins. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># ./configure --prefix=/usr/local/icinga --with-cgiurl=/icinga/cgi-bin --with-nagios-user=icinga --with-nagios-group=icinga
# make
# make install</pre>
Starting Icinga: 
 
Verify the sample Icinga configuration files. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># /usr/local/icinga/bin/icinga -v /usr/local/icinga/etc/icinga.cfg</pre>
If there are no errors, start Nagios and Idoutils. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># /etc/init.d/icinga start
# /etc/init.d/ido2db start</pre>
Start Icinga and Idoutils on system startup. 
 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># chkconfig ido2db on
# chkconfig icinga on
# systemctl enable httpd.service
# systemctl enable mariadb.service</pre>
Access Web Interface: 
 
Now access Icinga web interface using the following URL. You'll be prompted for the username (icingaadmin) and password you specified earlier. 
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How to install and setup Icinga Monitoring Tool on CentOS 7 / RHEL 7

Setup Icinga Monitoring Tool on CentOS 7 / RHEL 7 Icinga is an open source computer system and network monitoring application. It was orig...

How to Send Email from Node.js

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<h1 class="title single-title title20" style="-webkit-text-stroke-width: 0px; background-color: white; border: 0px; font-family: 'Roboto Slab'; font-size: 28px; font-style: normal; font-variant: normal; font-weight: 700; letter-spacing: normal; line-height: 38px; margin: 0px 0px 5px; opacity: 1; orphans: auto; outline: 0px; padding: 0px; text-align: center; text-indent: 0px; text-transform: none; transition: opacity 0.24s ease-in-out; vertical-align: baseline; visibility: visible; white-space: normal; widows: 1; word-spacing: 0px;">
Send Email from Node.js</h1>
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Node.js is an open-source, cross-platform runtime environment for developing server-side Web applications. Although <a href="http://www.hackthesec.co.in/search/label/Node.Js">Node.js</a> is not a JavaScript framework, many of its basic modules are written in JavaScript, and developers can write new modules in JavaScript. The runtime environment interprets JavaScript using Google's V8 JavaScript engine.</div>
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First you need to install nodemailer package in your application. Use following command to install this package.</div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">$ npm install nodemailer</pre>
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Now add following code in your application to send email. Make sure to update all required values in below code to send email successfully.</div>
<div>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">var nodemailer = require('nodemailer');

var mailTransport = nodemailer.createTransport('smtps://user%40gmail.com:email_password@smtp.gmail.com');

var mailOptions = {
 from: "Sender Name <sender@example.com>",
 to: "Recipient Name <recipient@example.com>",
 subject: "Hello World",
 text: "Test email with node.js"
 html: 'Test email with node.js'
};

mailTransport.sendMail(mailOptions, function(error, info){
 if(error){
 return console.log(error);
 }
 console.log('Message sent: ' + info.response);
});
</pre>
<div>
If you are still facing any issue with sending email through Gmail stmp servers make sure you are using correct login details. For 2 factor authentication enabled account required to generate application specific password and set here. Also you allow <a href="https://www.google.com/settings/security/lesssecureapps" target="_blank">less secure apps</a> in your Gmail account.</div>
<div>
 </div>
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How to Send Email from Node.js

Send Email from Node.js Node.js is an open-source, cross-platform runtime environment for developing server-side Web applications. Alth...

Allow/deny,disable or drop/block ping packets on Linux serves

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Allow/deny,disable or drop/block ping request 
Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network, and to measure the round-trip time for messages sent from the originating host to a destination computer and echoed back to the source.  
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMkvanWwL3sQ5vslmP9RJn-wN23GzG7XOupgaiHDMQJzpuqMvvq8LlJAZ6Q0fGyREUOXoCHIEyBnFXFWJFq0YlnOGnfGnZmTFBoPHoDn4etpw8Fi6u-G95vqTG-_KDlTEvCd2xtpZxzRHE/s1600/security.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMkvanWwL3sQ5vslmP9RJn-wN23GzG7XOupgaiHDMQJzpuqMvvq8LlJAZ6Q0fGyREUOXoCHIEyBnFXFWJFq0YlnOGnfGnZmTFBoPHoDn4etpw8Fi6u-G95vqTG-_KDlTEvCd2xtpZxzRHE/s1600/security.jpg" /></a></div>
 
The name comes from active sonar terminology that sends a pulse of sound and listens for the echo to detect objects under water,although it is sometimes interpreted as a backronym to packet Internet groper 
Blocking PING on server is helpful sometimes, if the server is continue to face any type of DDoS attack by using the PING feature. By using <a href="http://www.hackthesec.co.in/search/label/Iptables" target="_blank">iptables </a>we can simply stop the PING option. 
STEP : 1 
You can setup kernel variable to drop all ping packets. Type the following command at shell prompt: 
This instructs the kernel to simply ignore all ping requests. 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all</pre>
To enable ping request type the command: 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">echo "0" > /proc/sys/net/ipv4/icmp_echo_ignore_all</pre>
You can add following line to /etc/sysctl.conf file: 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># vi /etc/sysctl.conf </pre>
Append following line: 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">net.ipv4.icmp_echo_ignore_all = 1</pre>
Save and close the file. 
STEP : 2 
Also we can manage it by the help of '<a href="http://www.hackthesec.co.in/search/label/Iptables" target="_blank">iptables</a>'. The 'ping' is using ICMP to communicate. We can simply manage the 'icmp : Internet Controlled Message Protocol'from iptables. 
The below pasted switches are required for creating a rule for managing icmp. 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">-A : Add a rule
-D : Delete rule from table
-p : To specify protocol (here 'icmp')
--icmp-type : For specifying type
-J : Jump to target</pre>
Normally using icmp types and its Codes Click here for ICMP Types and Codes 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">echo-request : 8
echo-reply : 0
</pre>
<div>
How to block PING to your server with an error message?</div>
In this way you can partially block the PING with an error message 'Destination Port Unreachable'. Add the following iptables rules to block the PING with an error message. (Use REJECT as Jump to target) 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A INPUT -p icmp --icmp-type echo-request -j REJECT</pre>
Result : -  
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">[root@redhat ~]# ping hackthesec.co.in
Pinging hackthesec.co.in [216.239.34.21] with 32 bytes of data:
From 216.239.34.2 icmp_seq=1 Destination Port Unreachable
From 216.239.34.2 icmp_seq=2 Destination Port Unreachable
From 216.239.34.2 icmp_seq=3 Destination Port Unreachable</pre>
To block without any messages use DROP as Jump to target. 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A INPUT -p icmp --icmp-type echo-request -j DROP
iptables -A OUTPUT -p icmp --icmp-type echo-reply -j DROP</pre>
Allow Ping from Outside to Inside 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT</pre>
How to block PING from your server? 
In this way you can block PING option from your server to outside. Add these rules to your iptables to do the same. 
 
Block PING operation with message 'Operation not permitted' 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A OUTPUT -p icmp --icmp-type echo-request -j DROP</pre>
Result:- 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">root@test [~]# ping google.com
PING google.com (173.194.34.136) 56(84) bytes of data.
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted</pre>
To block with out any error messages 
For this, DROP the echo-reply to the INPUT chain of your iptables. 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A OUTPUT -p icmp --icmp-type echo-request -j DROP
iptables -A INPUT -p icmp --icmp-type echo-reply -j DROP</pre>
Allow Ping from Inside to Outside 
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT
iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT</pre>
You can use the icmp code instead of icmp-type name for adding rule to iptables. 
 
<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>

Allow/deny,disable or drop/block ping packets on Linux serves

Allow/deny,disable or drop/block ping request Ping is a computer network administration software utility used to test the reachability of ...

How to Install R on Ubuntu 15.10

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<h1 style="box-sizing: border-box; font-family: Raleway, Helvetica, Arial, sans-serif; line-height: 46px; margin: 0px 0px 8px;">
Installing R on Ubuntu 15.10</h1>
<div>
<div>
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiv3s0gpPWiNS8sFiRQ0ilWI4cw7L07aMuNvPNzkZ_LudF-Z8vjj8CX2Von03FAtVgIJrMn9bjN70f7g-ubG96yRnQkio1HM4ep-FsoSEJdWw_IG25yOlyxAt-lhYhho3J6fsnsyXZx6MzT/s1600/Rlogo_hackthesec.co.in.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiv3s0gpPWiNS8sFiRQ0ilWI4cw7L07aMuNvPNzkZ_LudF-Z8vjj8CX2Von03FAtVgIJrMn9bjN70f7g-ubG96yRnQkio1HM4ep-FsoSEJdWw_IG25yOlyxAt-lhYhho3J6fsnsyXZx6MzT/s1600/Rlogo_hackthesec.co.in.png" /></a>R is a programming language and software environment for statistical computing and graphics supported by the R Foundation for Statistical Computing.The R language is widely used among statisticians and data miners for developing statistical software and data analysis Polls, surveys of data miners, and studies of scholarly literature databases show that R's popularity has increased substantially in recent years.</div>
<div>
 </div>
<div>
R is an implementation of the S programming language combined with lexical scoping semantics inspired by Scheme.S was created by John Chambers while at Bell Labs. There are some important differences, but much of the code written for S runs unaltered.</div>
</div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9junrIIkb8EY0_mU_WR180LPDYuEMASRIbxl7US5fRknWKQCS7TIA4N6-4mXkC3Wbwsw3VEOF6yNJbzuL6e_KQvg_1x04PG-EgCR7qP4iPsIF3PEnbr2Ves_CNYht6L9oIXkf_nDuo6ER/s1600/why-learn-r_hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9junrIIkb8EY0_mU_WR180LPDYuEMASRIbxl7US5fRknWKQCS7TIA4N6-4mXkC3Wbwsw3VEOF6yNJbzuL6e_KQvg_1x04PG-EgCR7qP4iPsIF3PEnbr2Ves_CNYht6L9oIXkf_nDuo6ER/s1600/why-learn-r_hackthesec.co.in.jpg" /></a></div>
<div>
 </div>
<div>
Installing R Programming Language</div>
<div>
You can install R by executing:</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">apt-get -y install r-base</pre>
</div>
<div>
Try running the command 'R' (capital letter).</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">R version 3.2.2 (2015-08-14) -- "Fire Safety"
Copyright (C) 2015 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

Natural language support but running in an English locale

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.</pre>
</div>
<div>
Quit:</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"> q(save = "no")</pre>
</div>
<div>
Installing packages</div>
<div>
R packages are packages that extend the capabilities of R. Enter R:</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">R</pre>
</div>
<div>
There are two ways to install R packages. First of all, if you want to install a package only for the current user, you can execute the following in R:</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">install.packages("name")</pre>
</div>
<div>
If you want to install a package available for all users on the system, there are multiple mirrors for both R and its packages. Execute:</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">su - -c "R -e \"install.packages('name', repos = 'http://cran.rstudio.com/')\""</pre>
</div>
<div>
Replace name with the package name.</div>
<div>
<div>
Please note: that you do not want to install R with packages on a server with less than 1 GB RAM.</div>
<div>
For further learning, please visit the <a href="http://www.r-project.org/" target="_blank">R website.</a></div>
</div>
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 </div>
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 </div>
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How to Install R on Ubuntu 15.10

Installing R on Ubuntu 15.10 R is a programming language and software environment for statistical computing and graphics supported by t...

How to Delete Files Older than X Number of Days in Linux

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<h2 class="title single-title title20" style="background-color: white; border: 0px; font-family: 'Open Sans'; font-size: 24px; line-height: 30px; margin: 0px 0px 5px; opacity: 1; outline: 0px; padding: 0px; transition: opacity 0.24s ease-in-out; vertical-align: baseline; visibility: visible;">
Delete Files Older than X Number of Days in Linux</h2>
<div>
How to keep limited amount of backup files or how to delete backup files or any file than older then x number of Days.</div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1XyDsm5bthyO-_-OqpH89oK8Sw-efgEPeY_inf32JcMAXIYo2vTx-PBhzPdnMbUz0aJXJSiqDm9USNl0cM4lj24WhhGm858N8_Wl43zO7AKVMzSdgXeLDYmhRyHQraYf_12AoDqRPhk4Z/s1600/delete_x_number_files_hackthesec.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1XyDsm5bthyO-_-OqpH89oK8Sw-efgEPeY_inf32JcMAXIYo2vTx-PBhzPdnMbUz0aJXJSiqDm9USNl0cM4lj24WhhGm858N8_Wl43zO7AKVMzSdgXeLDYmhRyHQraYf_12AoDqRPhk4Z/s1600/delete_x_number_files_hackthesec.jpg" /></a></div>
<div>
 </div>
<div>
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Using find utility we can easily figure out files older than x number of days and then use the rm command to delete them.</div>
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
Here is combination of find and rm command to find and delete older files using some interesting arguments.</div>
<div style="font-family: verdana, geneva, sans-serif;">
Find All Files Inside Directory and Delete Files which is Older Than 10 Days</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">find /location/to/find/files/* -mtime +10 -exec rm {} \;</pre>
</div>
<div>
Command Explanation:</div>
<div>
 </div>
<div>
<div>
1) find /location/to/find/files/*</div>
<div>
=This command use to find files in Linux operating system. Next part of this command is /locatin/to/find/files/ which means find files inside this directory suppose I have directory on root named backup so my command will be "find /backup/*".</div>
</div>
<div>
 </div>
<div>
<div>
2) mtime +10</div>
<div style="color: #333333;">
=The next argument -mtime, is used to specify the number of days. In our example we uses -mtime +10 so it will find files older than 10 days.</div>
</div>
<div>
<div>
3) -exec rm {} \;</div>
<div>
=The last argument contains two parts, "-exec" allows you to pass an other command such as rm, and the second part "{} \; " is required to end the command.</div>
</div>
<div>
 </div>
<div>
Delete Files which is Older Than 5 Days With .tar File Extension.</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">find /backup -name "*.tar" -type f -mtime +5 -exec rm -fr {} \;</pre>
</div>
<div>
Very Important: Be VERY careful to supply an absolute path while using "rm" commands!</div>
<div>
Find and Delete Files using Find Command.</div>
<div>
Same task you can perform using find command only. See below example:</div>
<div>
<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">find /location/to/find/files/* -mtime +10 -type f -delete</pre>
</div>
<div>
Tip:- you can add this command in bash script and automate this process using <a href="http://www.hackthesec.co.in/2016/03/how-to-setup-linux-crontab.html" target="_blank">cron job utility</a>.</div>
<div>
 </div>
<div style="color: #333333; font-family: verdana, geneva, sans-serif; font-size: 15px; line-height: 26px;">
<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>
</div>
</div>

How to Delete Files Older than X Number of Days in Linux

Delete Files Older than X Number of Days in Linux How to keep limited amount of backup files or how to delete backup files or any file t...

How to Block Facebook, Twitter and YouTube HTTPS Traffic In Squid Transparent Proxy Mode

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Block Facebook, Twitter and YouTube’s HTTPS Traffic In Squid Transparent Proxy Mode 
After setting up <a href="http://www.hackthesec.co.in/2016/05/how-to-configure-squid-3x-as.html" target="_blank">Squid As Transparent Proxy Mode</a>, most of the system admins try to block famous social media websites such as Facebook, Twitter and YouTube in their network.So in this guide we will learn how to Block HTTPS Traffic while Squid is running as Transparent Proxy. 
<a href="http://www.hackthesec.co.in/2016/05/how-to-configure-squid-3x-as.html" itemprop="url" style="background-color: white; display: block; font-family: 'Open Sans', serif, sans-serif; font-size: 18.6px; font-weight: 600; text-decoration: none;"></a> 
<ul style="text-align: left;">
<li><a href="http://www.hackthesec.co.in/2016/05/how-to-configure-squid-3x-as.html" itemprop="url" style="display: inline !important; font-size: 18.6px; text-decoration: none;">How to Configure Squid 3.x as Transparent Proxy on CentOS 7 / RHEL 7</a></li>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiu5EEcgs1XrKXPdiyB1Q9PXqvHPrQfndedFITprHVBeAFc0Ob0eu6tPF6Q9cnbSsn_9PcqWs-TgRQ5VdO5HmWfRMMgzhp8Niz6GEiKzSFt5fc76UHNuThqmUgiwW1P1-451tDcx7pK59RW/s1600/access-blocked-websites-hackthesec.co.in.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiu5EEcgs1XrKXPdiyB1Q9PXqvHPrQfndedFITprHVBeAFc0Ob0eu6tPF6Q9cnbSsn_9PcqWs-TgRQ5VdO5HmWfRMMgzhp8Niz6GEiKzSFt5fc76UHNuThqmUgiwW1P1-451tDcx7pK59RW/s1600/access-blocked-websites-hackthesec.co.in.png" /></a></div>
 
We understand now that 443 port traffic is passing through iptables firewall. So with the help of iptables string matching feature we will see how to block Facebook, Twitter and YouTube HTTPS traffic. 
Iptables Rule to Block Facebook in Squid Transparent Proxy Setup 
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -I FORWARD -p tcp --dport 80 -m string --string 'facebook.com' --algo bm --to 65535 -j DROP</pre>
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iptables -I FORWARD -p tcp --dport 443 -m string --string 'facebook.com' --algo bm --to 65535 -j DROP</pre>
Iptables Rule to Block Twitter in Squid Transparent Proxy Setup 
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -I FORWARD -p tcp --dport 80 -m string --string 'twitter.com' --algo bm --to 65535 -j DROP</pre>
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iptables -I FORWARD -p tcp --dport 443 -m string --string 'twitter.com' --algo bm --to 65535 -j DROP</pre>
Iptables Rule to Block YouTube in Squid Transparent Proxy Setup 
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -I FORWARD -p tcp --dport 80 -m string --string 'youtube.com' --algo bm --to 65535 -j DROP</pre>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">
iptables -I FORWARD -p tcp --dport 443 -m string --string 'youtube.com' --algo bm --to 65535 -j DROP</pre>
Above rules will block entire traffic destine to 443 port but you can apply same rule on particular single ip, range of ips or complete network. 
To Apply Same Rule on Single IP Address 
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -I FORWARD -p tcp --dport 443 -s 192.168.2.10 -m string --string 'youtube.com' --algo bm --to 65535 -j DROP</pre>
To Apply Same Rule on Range of IP Addresses 
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -I FORWARD -p tcp --dport 443 -m iprange --src-range 192.168.2.11-192.168.2.15 -m string --string 'youtube.com' --algo bm --to 65535 -j DROP</pre>
Above rule will block YouTube.com only specified ips from 11 to 15 other all range is allowed. 
To Apply Same Rule on Whole Subnet of 192.168.2.0/24 
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">iptables -I FORWARD -p tcp --dport 443 -s 192.168.2.0/24 -m string --string 'youtube.com' --algo bm --to 65535 -j DROP</pre>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"><a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></pre>
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How to Block Facebook, Twitter and YouTube HTTPS Traffic In Squid Transparent Proxy Mode

Block Facebook, Twitter and YouTube’s HTTPS Traffic In Squid Transparent Proxy Mode After setting up Squid As Transparent Proxy Mode , mos...

How to Configure Squid 3.x as Transparent Proxy on CentOS 7 / RHEL 7

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Configure Squid 3.x as Transparent Proxy on CentOS 7 / RHEL 7</h2>
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There are several benefits of using a transparent proxy. First of all, for end users, a transparent proxy can enhance their web browsing performance by caching frequently accessed web content, while introducing minimal configuration overhead for them. For administrators, it can be used to enforce various administrative policies such as content/URL/IP filtering, rate limiting, etc.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1VrRyKPmaAN8_k1ni3Alq0RVqEPZim4tvw83TXom35GD6ZGJrboNOHhJ97rT251n4G6I7iWctMMqdO5wN9jm5mrF3yErWGe65h2lNz-DioH6G_eOWTR2IFdWRyI2pi9EiwY8B7F-8CN0J/s1600/squid-installation-hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1VrRyKPmaAN8_k1ni3Alq0RVqEPZim4tvw83TXom35GD6ZGJrboNOHhJ97rT251n4G6I7iWctMMqdO5wN9jm5mrF3yErWGe65h2lNz-DioH6G_eOWTR2IFdWRyI2pi9EiwY8B7F-8CN0J/s1600/squid-installation-hackthesec.co.in.jpg" /></a></div>
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A proxy server acts as an intermediary between a client and a destination server. The client sends requests to the proxy server which then evaluates the requests and takes necessary actions. In this tutorial, we will be setting up a web proxy server using Squid, which is a robust, customizable and stable proxy server. Personally, I had administered a Squid server with 400+ client workstations for about a year. Although I had to restart the service about once a month in average, CPU and storage utilization, throughput and client response time were all great.</div>
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Squid Installation and Configuration</div>
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<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># yum install squid –y</pre>
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Edit squid configuration file</div>
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Before you edit default configuration file it is highly recommended to keep backup.</div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># cp /etc/squid/squid.conf /etc/squid/squid.conf.bk-26-05-2016</pre>
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Open configuration file and add below mentioned parameters</div>
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<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># vi /etc/squid/squid.conf</pre>
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Add transparent proxy setting and add and allow our network</div>
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<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># vi /etc/squid/squid.conf</pre>
<pre style="background: rgb(54, 54, 54); border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># Allow LAN Network
acl our_network src 192.168.2.0/24

# Allow Network ACL Allow/Deny Section#
http_access allow our_network

# Transparent Proxy Parameters
http_port 3128 intercept

visible_hostname pxy.hackthesec.co.in</pre>
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Save & Exit</div>
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Now start squid service and make sure it is added on startup.</div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;"># systemctl start squid
# systemctl enable squid</pre>
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Add necessary iptables rules to setup squid as transparent proxy.</div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">ptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to 192.168.2.100:3128
iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j REDIRECT --to-port 3128
iptables --t nat -A POSTROUTING --out-interface eth1 -j MASQUERADE</pre>
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Now you can save your iptable rules by following command:</div>
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<pre style="background-attachment: initial; background-clip: initial; background-color: #363636; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 7px; border: 1px solid rgb(221, 221, 221); font-stretch: inherit; margin-bottom: 15px; margin-top: 15px; overflow-x: auto; overflow-y: hidden; padding: 18px 20px; vertical-align: baseline;">service iptables save</pre>
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That’s It, Now squid should work smoothly in transparent proxy mode.</div>
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<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>
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