Re: [Devil-Linux-discuss] Re: Routing problems - can't get out

[Alex P. <ap...@ap...>]

I'm not sure if the packets that go out eth0 originate from 192.168.2.x
or 192.168.3.x now... You might want to verify it's from a 192.168.2.x ip :)

Alex

Alan Delaney wrote:

> Alex,
>
> Thanks a lot for your info.  Here's what I tried.
>
> Initially when I set up the Slackware boxes I had them congifured to
> use  the DL box as their gateway (the internal eth1 address on the
> 192.168.3.x subnet).  I did as you suggested and ran "tcpdump -i eth0
> icmp" on the DL box and then ran a few ping commands from one of the
> internal machines.  Pinging the DL box's eth1 address ran as expected
> and tcpdump gave the output that I would expect.  Pinging its eth0
> address on the 192.168.2.x subnet also ran as expected.  However when
> I tried to ping one of the other devices on the 192.168.2.x subnet I
> gopit an error message from ping but tcpdump gives no output at all. 
> Strange, I would have expected it to register the ping as the
> Slackware box was configured to use the DL box as a gateway.  I dug
> around a bit to try and discover what was wrong and discovered the
> route command which I'd only heard about but had never studied or
> used.  After reading the man page for it I tried another idea.  Purely
> as an experiment, not knowing if it would work or not, I ran netconfig
> on the Slackware box again and changed the settings so that it would
> use the modems IP address on the 192.168.2.x subnet as the gateway and
> nameserver and then ran the command "route add -host 192.168.2.1 gw
> 192.168.3.1".  Now pinging the modem worked!  I then tried to ping
> Google - success!  As a final test I started up X and loaded Firefox -
> yes, I'm now on the Internet from my internal network via the DL
> box!!  To be honest I'm not entirely sure why this worked but it did
> so I'm not complaining.
>
> Thanks a lot for your help in pointing me in the right direction, I
> really appreciate that.
>
>
>
> Alan
>
>
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