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From: Diego Torres <dtorres@coral.dnsalias.org>
To: lartc@vger.kernel.org
Subject: [LARTC] port-mapping with 2 isps
Date: Wed, 23 Apr 2003 23:17:14 +0000	[thread overview]
Message-ID: <marc-lartc-105113992702879@msgid-missing> (raw)


hello... i've got an annoying problems that makes me think that i want to do something that is impossible... :) explanation:


i've two dsl lines and a linux box as a "load balancer".

some traffic goes out by eth0 and other goes out by eth1. (i mark the packets with iptables and then have 2 route tables)

i'm currently forwarding some incoming connections (to the port 80 on eth0) to another host inside the network. this works without problems as long as eth0 is the default gateway.

trying to forward connections on eth1 port 80 with eth0 as the default gateway results in the linux box loosing the answer packet from the host inside the network.


diagram:

inet | - isp1 -- eth0\
     |                - LINUX ROUTER - eth2 - swith - "server host"
     | - isp2 -- eth1/

# ip ro sh
81.33.13.128 dev eth1  scope link  src 81.33.13.174
80.25.88.192 dev eth0  scope link  src 80.25.88.228
80.25.88.192/26 dev eth0  proto kernel  scope link  src 80.25.88.228
81.33.13.128/26 dev eth1  proto kernel  scope link  src 81.33.13.174
172.16.0.0/16 dev eth2  proto kernel  scope link  src 172.16.0.2
default via 80.25.88.193 dev eth0

because eth0 is the default gw, i can forward incoming connections on eth0 to the "server host".

can anyone help me so i can forward conections happening on both interfaces (eth0 & eth1, doesn't matter who is the default gw) ?

thanks in advance....

-- 
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Diego Torres - dtorres@coral.dnsalias.org - Madrid / España
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             reply	other threads:[~2003-04-23 23:17 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-04-23 23:17 Diego Torres [this message]
2003-04-23 23:29 ` [LARTC] port-mapping with 2 isps Martin A. Brown
2003-04-24  0:26 ` Martin A. Brown

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