Hi,
I have a linux box with two dsl modems on it (connection is done via pppoe), I'm trying to route default traffic on the primary connection (ppp0) and mail traffic on another one (ppp1). This traffic will come from the localhost.
I run Slackware 9.1 (Kernel 2.4.22), recompiled with necessary options for using iproute2.
According to the advanced routing howto, I did the following :
iptables âA OUTPUT ât mangle âp tcp ââdport 25 âj MARK ââsetâmark 1
I use "-A OUTPUT" since I want to alter locally generated packets.
echo 201 mail.out >> /etc/iproute2/rt_tables
ip rule add fwmark 1 table mail.out
/sbin/ip route add default via [Second's ISP Gateway] dev ppp1 table mail.out
I get no error message, and ip rule ls and ip route show params where recorded, iptables -t mangle -lnV shows no problem too.
When I do telnet smtp.someisp.com 25, I see with tcpdump the packets going out through the interface ppp1 :
14:32:40.693429 62.212.120.196.34515 > 193.252.22.80.smtp: S 4069327741:4069327741(0) win 5808 <mss 1452,sackOK,timestamp 929359 0,nop,wscale 0> (DF) [tos 0x10]
But the problem is that there are originated from 62.212.120.196, which is the ip of ppp0, not ppp1. So packets can't take the way back.
How can I change the "from" ip of packets that are routed through ppp1 ?
Thanks for your help.
Julien
PS: I did a quite similar post in the netfilter list, and thanks to the guys there I succeeded solving the base problem (at start no packet was going out at all on ppp1) but now I know that lartc list exists, I think asking here is better.
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