Two network cards - routing and iptables

Harrison, Bruce (CXO) Bruce.Harrison at
Fri Aug 26 17:24:52 CEST 2005

Hello Clemens,

    For issue 1, perhaps you are blocking ICMP traffic on eth1?
    For issue 2, ip_forward needs to be set to a 1 (not part of

Take Care!


-----Original Message-----
From: netfilter-bounces at
[mailto:netfilter-bounces at] On Behalf Of Clemens
Sent: Friday, August 26, 2005 8:56 AM
To: netfilter at
Subject: Two network cards - routing and iptables

Hi there,

I've just discovered the power of iptables and it just works well in
my selfbuilt isdn router. However now I also want to route between two
subnets and it just does not work.

I've two network cards in the pc:
eth0 -
eth1 -

when I try to ping another computer connected to
everything works fine, however I cannot ping my access-point in (which works from a stand-alone computer withought any

This are my routes:
LKLET021.highwa *      UH    0      0        0
ippp0     *        U     0      0        0
eth1     *        U     0      0        0
default         LKLET021.highwa          UG    0      0        0 ippp0

Furthermore it would be great if I could use this computer as a
gateway for all computers in and so that
each computer in this net could reach each other. I tried to configure
iptables a bit, but withought any success :-(

It would be great if anybody could help me, I know those are
newbie-questions, sorry.

Thank you in advance, lg Clemens

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