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Posted by terrydoc@o2.ie on June 24, 2008, 2:58 pm
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> Thanks for the reply, I'm sorry as in my original post I had changed
> some of the IP addresses and it appeared that the source and
> destination are all in the same network - this is not the case - see
> the correct debug output here. I know the client (10.0.18.35) can ping
> the NATted addresses (10.0.0.130/134/135) - so NATting is working ok.
> But when the client tries to access the application I get...
> 3725_Backup#
> 17:42:35: IP: s=10.0.18.35 (Dialer4), d=10.0.0.135, len 48, rcvd 2
> 17:42:35: TCP src=2739, dst=3200, seq=3212891754, ack=0, win=32768
> SYN
>
> 17:42:35: IP: s=10.0.0.135 (local), d=10.0.18.35 (Dialer4), len 40,
> sending
> 17:42:35: TCP src=3200, dst=2739, seq=0, ack=3212891755, win=0 ACK
> RST
>
> 17:42:35: IP: s=10.0.18.35 (Dialer4), d=10.0.0.135, len 48, rcvd 2
> 17:42:35: TCP src=2739, dst=3200, seq=3212891754, ack=0, win=32768
> SYN
>
> 17:42:35: IP: s=10.0.0.135 (local), d=10.0.18.35 (Dialer4), len 40,
> sending
> 17:42:35: TCP src=3200, dst=2739, seq=0, ack=3212891755, win=0 ACK
> RST
>
***************************************************************************************
> Is it still the case that the app isn't listening on port 3200?
>
>
> > It's showing that the source IP 10.10.10.130 is attempting to connect to
> > 10.10.10.135 on port 3200 (The SYN packet). The server then responds with a
> > RST packet, which indicates that no application is listening on port 3200.
> > The source and destination are all inside networks (all on the 10.10.10.x
> > network), so no NATing is being done
>
>
>
> > > Users cannot connect to the applications but can PING the app servers
> > > (10.10.10.130/134/135) - these are NATted - users see them as
> > > 192.168.0.42/37/35. Any suggestions on what the router debug output is
> > > saying?
OK it is sorted... I had the Dialer interface on the router set up
without "ip nat outside". It is unusual though, as once the router has
the static NATs configured the router responds to the remote PING
requests even if the 3 server are plugged out of the network...
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