From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julien Subject: routing mail on a different gateway Date: Fri, 23 Jul 2004 10:15:01 +0200 Sender: netfilter-admin@lists.netfilter.org Message-ID: <4100C905.1040001@tri-oxyde.org> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: Errors-To: netfilter-admin@lists.netfilter.org List-Help: List-Post: List-Subscribe: , List-Id: List-Unsubscribe: , List-Archive: Content-Type: text/plain; charset="utf-8"; format="flowed" To: netfilter@lists.netfilter.org Good Morning, I have a linux box with two dsl modems on it (connection is done via=20 pppoe), I'm trying to route default traffic on the primary connection=20 (ppp0) and mail traffic on another one (ppp1). This traffic should be able to come from the localhost or the lan via NAT= . I run Slackware 9.1 (Kernel 2.4.22), recompiled with necessary options=20 for using iproute2. According to the advanced routing howto, I did the following : iptables =E2=88=92A PREROUTING =E2=88=92i eth0 =E2=88=92t mangle =E2=88=92= p tcp =E2=88=92=E2=88=92dport 25 =E2=88=92j MARK=20 =E2=88=92=E2=88=92set=E2=88=92mark 1 iptables =E2=88=92A PREROUTING =E2=88=92i lo =E2=88=92t mangle =E2=88=92p= tcp =E2=88=92=E2=88=92dport 25 =E2=88=92j MARK=20 =E2=88=92=E2=88=92set=E2=88=92mark 1 I'm not sure whether "lo" is needed. 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=20 mail.out I get no error message, and ip rule ls and ip route show params where=20 recorded. But if I do telnet somemail.server.com 25, I get a timeout and no data=20 is sent via ppp1 (seen using ifconfig ppp1 or tcpdump -i ppp1). I can't figure what can be wrong nor where I should start looking for. I also looked in the ip-cref doc and found nothing that could help me. Feel free to ask me on any point I would have forgotten. Do you have an idea in order to solve this problem ? Thanks, in advance ! Julien.