hello friends, I have written the script using iptables masquerading for internet. After booting the system I have to run the script explicitly. Where should i put the script so that it can run automatically after booting. I tried to put in ifcfg-eth0 and ifcfg-eth1 but when network service gets started or restarted all my rules gets flushed. Thanks Shahzin

run the script from /etc/rc.d/rc.local

thanks john for the response. it is working But if i restart network service rules get flushed and i have to re run the script. Is this possible to avoid this so that if i run some service rules doesn't get flushed even if i restart some service Thanks Shahzin

As you want the script to be run every time your network starts as opposed to when your computer starts you don't want to put it into rc.local (which is like autoexec.bat). I am unfamiliar with Fedora but you need to find what scripts control bringing your network interface up and down. I seem to remember something about /etc/sysconfig/network when I last played with redhat (v5.2!)....