On Fri, May 03, 2002 at 03:29:22PM +0100, Sean Doran wrote:
> Michael Richardson <mcr@sandelman.ottawa.on.ca> writes:
> 
> >   There are lots of lines without "tcp sum ok" on them!
> >   They all are from world.22 > state-a.
> 
> Right, I expect that from tcpdump.
> You get [bad tcp cksum %x!] on inbound traffic that
> doesn't sum right.

Have you tried the userland bridge code from pkgsrc?  'net/bridged'
It may be too slow for your tests, but might provide an additional data
point.

-Andrew