Mailinglist Archive: opensuse (2271 mails)

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RE: [SLE] Two network cards (dual-homed), two gateways? Desparate for help
  • From: "Damon Jebb" <list@xxxxxxxxxxxxx>
  • Date: Wed, 7 Apr 2004 12:11:00 +0100
The default gateway is a way of telling the system how to send packets
for networks that are not known about. The 10. and 192. networks are
both known about (on this server) and should therefore simply get the
packets sent to the right network card. By setting the default gateway
on this machine to 192.x.x.1 you are telling the machine that the
packets for any unknown network should be forwarded to this IP. Is this
what you want? Is the 192.x.x.1 really a gateway device (router or
another box setup as a router?) to which all packets for unknown
networks should be sent? Is this setting on the server or on the client
machines? The client machines on the 10.x.x.x network should use a
10.x.x.x IP as the gateway, not the 192.x.x.x unless they also have a
properly defined route to the 192 network as well.


-----Original Message-----
From: Preston Crawford [mailto:me@xxxxxxxxxxxxxxxxxxx]
Sent: 07 April 2004 07:00
To: suse-linux-e@xxxxxxxx
Subject: [SLE] Two network cards (dual-homed), two gateways? Desparate
for help

I'm having a bit of a problem. I'm managing a Linux server running SuSE
8.2. The server is dual-homed so it sits on two networks. In the network
devices application in Yast in the "routing" section you have the option
of either choosing a single default gateway or using "expert
configuration" to setup routing. Now we need to have each network card
use a different gateway. Here is the way it's currently working.

We have one network (192.....) that we need to have running SSH and
samba. We have another network (10......) that we need to have samba
access. This works out great except one hitch.

If I just put in 192.X.X.1 as the default gateway, the 10.... network
can't get to the share. I think the reason being that upon return the
traffic tries to go by way of the default gateway (192.x) and can't find
it's way back to the 192 network. If I flip it and make the default
gateway 10.X.X.1 the 10.... network can get to the share, but SSH has a
problem because it tries to return via that gateway. So it's a mess and
I know there *has* to be a way to get this to work. I just need to know
how. Somewhere in the "expert" part of the "routing" section, there has
to be settings I can put in to basically allow all traffic bound for the
192 card (eth0 in this case) return via the 192 gateway. And all traffic
bound for the 10 card (eth1 in this case) return via the 10 gateway. I
just don't know how to set this up.

Any advice would be GREATLY appreciated.


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