[Sderby] Suse gateway help needed!

[hemstock at tiscali.co.uk]

>-- Original Message --
>From: "Matthew Humphreys" <matthew.humphreys at emsolutions.co.uk>
>To: <sderby at mailman.lug.org.uk>
>Date: Tue, 9 Mar 2004 00:10:55 -0000
>Subject: [Sderby] Suse gateway help needed!
>Reply-To: South Derby LUG General Mailing List <sderby at mailman.lug.org.uk>
>
>
>
>Hi there!
>
>I am having difficultly connecting to my satelite broadband connection
>which I shared over a wireless link from the other side of the village.
>
>Let me explain....
>
>My local network operates on the 192.168.0.x subnet.
>
>The link to the satelite is on the 192.168.1.x subnet.
>
>My lan is mailnly xp based.
>
>I have suse box with 2 n/w cards in it - one is configured as
>192.168.0.122 (internal), the other as 192.168.1.228 (external).
>
>Into the external card is plugged a wireless router (192.168.1.227)
>which in turns talks to the box controling the satelite - 192.168.1.1.
>
>I can ping both cards from the winxp boxes, and ping them from the suse
>box.  I can ping the wireless routed from the suse box, but not from the
>winxp boxes.
>
>I have told xp to use 192.168.0.122 as its default gateway.
>
>The linux box can sorf/browse over the sat. link, but I cannot use it
>over the network.  IP forwarding is enabled on the suse box.
>
>To get me out of jail,  I can installed squid on the suse box, but this
>doesn't help with the email collection from the individual clients.
>
>Please can someone offer some help?
>
>I am in Austrey - is anyone local enough to see if they can help.
>
>I am a definite novice, so need simple instructions!  Webmin is
>installed!
>
>Many thanks for your help,
>
>
>Matthew.

Hi Matthew,

The problem is that IP forwarding simply routes packets between the two
NICs in the Linux box.  It will route packets from the 192.168.0.0 network
to their destination, however, the destination machine, whereever it may
be, will not know how to get back to your network.  You need to enable IP
masquarding (NAT) on your Linux box.  This will address the packets sent
from your network with the IP address of the external interface of your
Linux box, so that destination machines can find it.  I can't remember the
commands to enable IP masquarading, but I will have a look when I get home.

It's worth noting that your ISP is using the 192.168.1.0 network, which
isn't routable on The Internet either, so they too will be NATing at some
point.

Mike.



__________________________________________________
Broadband from an unbeatable £15.99!

http://www.tiscali.co.uk/products/broadband/home.html?code=SM-NL-11AM