CentOS / Red Hat Linux IP Forwarding How To

Posted on in Categories , , , last updated July 5, 2009

How do I enable IP forwarding under RHEL / Red Hat / Fedora / CentOS Linux operating systems?

You can easily turn on IP forwarding under Linux operating system by modifying Linux kernel variables (MIB).

Linux Enable IP Forwarding

Open /etc/sysctl.conf file using a text editor, enter:
# vi /etc/sysctl.conf
Set net.ipv4.ip_forward to 1, enter:

net.ipv4.ip_forward = 1

Save and close the file. Reload the changes by typing the following command:
# sysctl -p

See: How to setup Linux as a router for DSL, T1 line etc

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

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