I have an host that has 2 NIC: one with a.b.c.d a.b.c.e and a.b.c.f another with i.j.k.l i.j.k.m i.j.n.l and i.j.n.m I wish that a number of users (that can be made member or not member of a certain group) would use always i.j.n.m address to connect to outside world, so i can set iptables on that address in a different way than for the system and the rest of users. Is there a way to accoplish this ?