2.6.9 tcp problems

[kernel]

I've run into a problem with 2.6.(8.1,9) after installing a secondary 
firewall. When I try to pull data through the original firewall (mail, 
http, ssh), it stops after approx. 260k. Running ethereal tells me "A 
segment before the frame was lost" followed by a bunch of  "This is a 
TCP duplicate ack" when using ssh. All 2.4.x machines and windows 
clients work fine. I built 2.4.28 and it works fine from my machine. I 
also fiddled with tcp_ecn and that didn't fix it either. I don't have 
any problems communicating to "local" machines. I've attached the 
tcpdump output from an scp attempt. NIC is a 3Com Corporation 3c905B.

Thanks !
walt

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