Mailinglist Archive: opensuse-security (334 mails)

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Re: [suse-security] Unwanted routing between subnets
  • From: Guido Tschakert <guido.tschakert@xxxxxxxxxxx>
  • Date: Tue, 09 Sep 2003 08:57:38 +0200
  • Message-id: <3F5D79E2.7090402@xxxxxxxxxxx>
Holger Schletz wrote:

I'm running a router on SuSE 8.2 which connects 2 local subnets to the internet. The subnets run over the same NIC with virtual interfaces:

eth0, subnet (call it subnet A)
eth0:1, subnet (call it subnet B)

(Yes, this is a mess, but fixing up this naturally grown network topology might induce even more trouble.)

eth1 connects to the internet.

Hello this box works at internetgateway, so routing is activated.
Since both subnets (192.168.. and 172.16..) are connected directly to the box, the router "knows" how to route between these subnets and does it ;-)
(Have a look at route -n)
I think the best (and easiest) way is to use the iptables-Rules as Bruno Leonhardt has written!

mit freundlichen Grüßen,

Guido Tschakert

SRC Security Research & Consulting GmbH
Graurheindorfer Str. 149a Tel: +49-228-2806-138
53117 Bonn Mobil:+49-160-3671422 Fax: +49-228-2806-199

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