bridge eth1 to eth0?

[Simon]

There are two ways to do this, and I'm not going to go into specifics,
unfortunately, cause I can't say out of memory how to do it in Ubuntu,
but you either would do some sort of routing (use your Ubuntu box as a
router, basically), or else you construct a network bridge with eth0
and eth1 included in the bridge (this is what I'd recommend).  After a
quick search, it looks like
https://help.ubuntu.com/community/NetworkMonitoringBridge has what you
need, see "Configuring the Bridge".  Don't follow the instructions
blindly, of course, you don't need ntop.
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