Hi there I'm trying to set up policy routing in a simple scenario without further success. My linux router is connected to two different cable ISPs. One of these links (hereafter named A) permits traffic to SMTP servers while the other (link B) doesn't. What I am trying to set up is: all traffic should flow through link B and only SMTP traffic through link A. What I am doing: Marking all packets from my intranet with source port within the range 1024 to 65535 and with destination port 25 with mark 0x3. I am also marking packets from our internal SMTP server with source port 25 to any other port with the same mark. Marks are being made in the OUTPUT chain (using iptables) as follows: iptables -t mangle -A OUTPUT -p tcp --sport 1024:65535 --dport 25 -j MARK --set-mark 3 iptables -t mangle -A OUTPUT -p tcp -s <MY SMTP SERVER> --sport 25 -j MARK --set-mark 3 Then, I have created a new routing table named SMTP-ROUTE with default gateway being the default gateway for link A as follows: ip ro add default via <A's default GW> table SMTP-ROUTE To complete the setup, I've added a rule stating that all packets marked with 0x3 should use SMTP-ROUTE with this command: ip ru add fwmark 3 table SMTP-ROUTE Yes, I've flushed the routing cache with: ip ro flush cache Default route in main routing table is B's gateway. I don't know why, but SMTP traffic keeps going through B's gateway, instead of A's, as expected. I've sniffed the network and, in fact, the packets are trying to go out through B's gateway. Can anyone please point what I am doing wrong? Thank you in advance -- Sellaro Agente Livre - Linux Community (www.agentelivre.org) PGP Key ID: 3ADF8645 PGP Key Fingerprint: 6AB0 D60B 69B5 B3F9 4553 2242 A1D0 17C0 3ADF 8645 _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
