Thursday, July 9, 2015

Delete a nat rule in iptables


First of all I list all the rules including line numbers like this;

iptables -L -t nat –line-numbers

I then look at the output that will be similar to the below

In this example lets say I want to delete rule number 2 in the PREROUTING chain, I would enter the following;

iptables -t nat -D PREROUTING 2

In English the above line means remove line number 2 from the PREOUTING chain, I would then run the first command again to check my iptables file, then save the iptables file and restart the iptables service.

iptables -L -t nat –line-numbers

service iptables save

service iptables restart

All the above is carried out running on Centos, you may have to edit slightly for your particular distribution.