Date: Tue, 07 Aug 2001 18:09:24 -0300 From: "Daniel C. Sobral" <daniel.sobral@tcoip.com.br> To: net@freebsd.org Subject: TCP windows and vlans? Message-ID: <3B705904.90005@tcoip.com.br>
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I'm observing the following problem: in a TCP connection between host F3 and any other host, the connection will stop when the TCP window first drops below the average packet length. The only thing that sets F3 apart is the fact that any connection to it is done through a vlan interface. I have put tcpdump log on http://people.freebsd.org/~dcs/f3.log showing the problem. Host 172.31.199.19 is F3. I ssh'ed into it, cat'ed a file a couple of times, and, when it finally blocked, I ping'ed it. I then typed ^C a few times (just to send characters to the other side) from the client, ping'ed again, and then let the connection be resetted for timeout. There is one extraneous connection as I ssh'ed into it to get http://people.freebsd.org/~dcs/netstat.log, showing that the send buffer on the server side (F3) is full of stuff. Now... I cannot see how could vlans possibly interfere with the tcp stack. Any hints anyone? I can provide whatever logs and dumps you wish from the client side, but since I cannot copy any sizeably log from F3 itself... -- Daniel C. Sobral (8-DCS) Daniel.Sobral@tcoip.com.br dcs@newsguy.com dcs@freebsd.org capo@notorious.bsdconspiracy.net A little humility is arrogance. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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