Mangle ip source with iptables

spank · 02-01-2008, 02:17 PM

Can I modify packets that leave my station using iptables to have a different source address ?

For example I have the ip X and I want the packets that leave the station having in the ip header the ip Y. I guess it has something to do with the mangle table of iptables but I`m not too good with that.

something like this maybe?

Code:

iptables -t mangle -A PREROUTING -s X -j SAME --to Y

Please help!

gilead · 02-02-2008, 12:34 AM

If you want to change the source address of packets leaving your box, you can use the POSTROUTING table. For example, with masquerading:

Code:

iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

Does the definition at http://www.netfilter.org/documentati...T-HOWTO-3.html describe what you're trying to do? If so the howto should be useful.