Mailinglist Archive: opensuse (3637 mails)

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Re: [SLE] How can I set up a basic gateway
  • From: Lenz Grimmer <grimmer@xxxxxxx>
  • Date: Thu, 3 May 2001 23:49:11 +0200 (CEST)
  • Message-id: <Pine.LNX.4.33.0105032344420.18673-100000@xxxxxxxxxxxxx>
On Thu, 3 May 2001, Matt wrote:

> Please could someone post me a very simple setup for configuring a
> gateway to connect 3 linux boxes to the internet where the modem is
> only connected to one box...
> ie internet <--->modem<--> box1 <---> box2 <--> box3
> So that all the users can connect to the internet.
> my network is setup with
> box1
> box2
> box3
> hostname box1 = linuxbox1
> hostname box2 = linuxbox2
> hostname box3 = linuxbox3
> All I need is edit this file .... type this into it etc.. etc...

So I assume box1 is your router, having the modem and one ethernet card
(, while box2 and box3 are on the same subnet. First of all:
can all boxes "talk" to each other, if you ping their IP addresses? If
yes, that's a good start. Basically, box2 and box3 should use box1' IP
address ( as their default gateway. Now box1 needs to know,
that is is supposed to forward incoming packets on eth0 to the modem.
Therefore box1 must have a default gateway, pointing to the Internet (this
is usually being set up automatically, when you dial in) and the variable
"IP_FORWARD" must be set to "yes" in /etc/rc.config. That should be it!

Or did I miss something here? I haven't done this for quite a while...

Lenz Grimmer SuSE GmbH
mailto:grimmer@xxxxxxx Schanzaeckerstr. 10 90443 Nuernberg, Germany
One who is always in a stew generally goes to pot.

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