Hi! I have the following: A RedHat 9.0 with 3 Network cards: One we use in local network (eth1) and the other (eth0 and eth2) to access the internet. I'd like to separate the traffic. In the eth0 use only with the e-mail server (pop, smtp, 1723, 1701 and protocol 47) and the eht0 with others traffis (http, https, msn....). I tried iptables -t nat -A POSTROUTING -o eth2 -s 172.17.1.8 -j MASQUERADE (--this ip addrs is pop and smtp server) iptables -t nat -A POSTROUTING -o eth0 -s 172.17.0.0/16 -j MASQUERADE But when I did this I could not access the port 1723, 1701 and protocol 47 using the eth2. I tried too use only iptables -t nat -A POSTROUTING -o eth2 -s 172.17.0.0/16 -j MASQUERADE And I got the same prob. If I use iptables -t nat -A POSTROUTING -s 172.17.0.0/16 -j MASQUERADE I will get a success access. Only when I use iptables -t nat -A POSTROUTING -s 172.17.0.0/16 -j MASQUERADE (without -o eth2 or -o eth0). Who could help me? Thanks Sebastião Antônio Campos Infojoi Computadores Ltda Joinville -SC - R. Iririú, 3587 Cml. (47) 437-0796 - Cel. (47) 9927-5349 tiao@xxxxxxxxxxxxxx http://www.lupusnet.com.br