exist a option of ip out_going, a sample the squid, tcp_outtcp_outgoing_address force the out trafic in interface eth0 or eth1 or eth2?
(eth1 - In) (Eth2 - Out)
PAP --> eth1 --> (ASTERISK) --> eth2 --> PAP
|
|-> eth0 (Local)
Tks.
Fox_killer.