[lug] connection path

[Kyle Moore]

If I have a system that sits on a network that two routers serve, is there
any way to tell which one a connection came through? I have two T1's from
different providers that come through two different routers. Both of the
routers internal interfaces are on the same subnet. If a connection is
made from the a machine on the net to a server is there any way I can tell
from the monitoring box which router the connection was made? The key is
using only the monitoring box to identify this info instead of info from
any other system.

I ran tcpdump -n -w logfile and I can see the arp requests but that is
about it.

            |                  |
            |                  |
        ____|___            ___|___
        |router|            |router|
        --------            --------
            |                  |
            |                  |
        ----------------------------
        |         switch           |
        ----------------------------
                  |        |
                  |        |
               -------    ---------
               |box a|    |monitor|
               -------    ---------


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Kyle Moore