Date: Tue, 2 Mar 2004 21:47:03 -0800 (PST) From: Don Lewis <truckman@FreeBSD.org> To: eugen@kuzbass.ru Cc: net@FreeBSD.org Subject: Re: Frozen connections Message-ID: <200403030547.i235l37E000190@gw.catspoiler.org> In-Reply-To: <40456D3C.773A3C29@kuzbass.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
On 3 Mar, Eugene Grosbein wrote: > H! > > I'm experiencing strange problems with HTTP connections between > two machines connected using 100Mbit ethernet switch. > Client is Windows 2000 SP4 (named kost), > server is FreeBSD 4.9/Apache 1.3.27 (named www). > --------------------------------------------------------------------------- > Packet 90 > TIME: 12:06:51.278337 (0.279509) > LINK: 00:90:27:AB:08:88 -> 00:90:27:35:05:1B type=IP > IP: www -> kost hlen=20 TOS=00 dgramlen=41 id=64CE > MF/DF=0/1 frag=0 TTL=64 proto=TCP cksum=A7ED > TCP: port http -> 2134 seq=1179931920 ack=1524903532 > hlen=20 (data=1) UAPRSF=010000 wnd=58400 cksum=FC43 urg=0 > DATA: t > --------------------------------------------------------------------------- > Packet 91 > TIME: 12:06:51.278615 (0.000278) > LINK: 00:90:27:35:05:1B -> 00:90:27:AB:08:88 type=IP > IP: kost -> www hlen=20 TOS=00 dgramlen=40 id=10E6 > MF/DF=0/1 frag=0 TTL=128 proto=TCP cksum=BBD6 > TCP: port 2134 -> http seq=1524903532 ack=1179931920 > hlen=20 (data=0) UAPRSF=010000 wnd=0 cksum=5466 urg=0 > DATA: <No data> > > As you see, last pair of packets repeats many times > and transfer is stalled here. What's wrong and who is guilty? It looks like the client is the guilty party. The server is sending 1-byte long window probes, and the client is responding with an ACK packet that is advertising a receive window of 0. I'd be suspicious of the application software on the client. Can you try a different web browser, or even fetch the same URL using something like telnet?
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200403030547.i235l37E000190>