How to Install Proxychains and Access Internet via Proxy in CentOS?

If your Linux machine is behind a proxy server, then you can install Proxychains package to access internet via the given proxy address. Proxychains is an opensource software that forces any TCP connection by a given application through proxy such as TOR (by default), SOCKS4, SOCKS5 and HTTP.

Well, here we go:

Install Proxychains:

# yum install git
 Installed:
 git.x86_64 0:1.7.1-3.el6_4.1
 Dependency Installed:
 perl-Error.noarch 1:0.17015-4.el6 perl-Git.noarch 0:1.7.1-3.el6_4.1

# git clone https://github.com/rofl0r/proxychains-ng.git

# cd proxychains-ng

# ./configure
# make && make install
make: Nothing to be done for `all'.
./tools/install.sh -D -m 644 libproxychains4.so /usr/local/lib/libproxychains4.so

# make install-config
./tools/install.sh -D -m 644 src/proxychains.conf /usr/local/etc/proxychains.conf

Configure Proxy server address and port in proxychains.conf

# vim /usr/local/etc/proxychains.conf

Add the below lines at the end of the file.

socks4  proxy-ip   proxy-port    username        password
http    proxy-ip   proxy-port    username        password

If the proxy server does not require authentication then simply remove username and password as shown below.

socks4  proxy-ip   proxy-port
http    proxy-ip   proxy-port

Note: Replace proxy-ip and proxy-port with correct proxy address and port.

How to use proxychains?

# proxychains4 telnet www.google.com 80
# proxychains4 wget http://google.com