Re: [lwip-users] Communication between different subnets

[Kieran Mansley]

On Tue, 2010-09-14 at 05:32 -0700, hellish wrote:
> Thanks for clearing up the IP destination confusion! Sure, I'll use wireshark
> to capture some packets tomorrow.
> Then again, I remember doing this yesterday and wireshark didn't see any
> packet (from my board to FTP server), hmm....

Where were you running wireshark?  If on your PC you wouldn't expect it
to see packets as they're not going to or from it.  If you can configure
your switch to do port mirroring you might be able to get them that way.
Alternatively get the packet capture by running it on something
mid-stream (e.g. the gateway).  That probably isn't an option on your
live school network, so you might need to set up a little network of
your own to reproduce it.

If the traffic level is very low and you can get the console output from
your board you might have luck just using the debug statements in lwIP
to dump details of the packets sent and received.  This is potentially
easy to try, though much less useful than a full packet capture.

Kieran