Hi Fabian: On Tue, Jan 27, 2009 at 08:16, Fabian Arrotin <fabian.arrotin at arrfab.net> wrote: > Question is : how can i "mangle" output packets to appear coming from > public ip and not from 192.168.X.X ? Found this that might help you (google for: linux default outgoing ip): """ > On a machine with multiple interfaces, is it possible to set the default > outgoing IP address to something other than the address for the interface > on the outgoing route? Yes. ip route add 10.1.1.0/24 via 192.168.1.1 src 172.16.1.1 ^^^ The src parameter tells the routing code to use this address when sending packets. The address only needs to be on the system. IE: ip addr add 172.16.1.1/32 dev dummy0 And send the packets out of eth0. """ From: http://lkml.indiana.edu/hypermail/linux/kernel/0112.1/0359.html Just make sure you keep a separate route for your ISP's side of the private network (maybe the one created when your interface goes up will do), otherwise your routing protocol might fail. HTH, Filipe