Date: Sat, 24 Feb 2007 16:15:49 +0100 From: Jeremie Le Hen <jeremie@le-hen.org> To: freebsd-net@FreeBSD.org Subject: TCP connection stalls on LAN Message-ID: <20070224151549.GJ2479@obiwan.tataz.chchile.org>
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--d8Lz2Tf5e5STOWUP Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi, I'm running a quite recent -CURRENT. I don't understand what's happening. According to tcpdump(1) it seems the two peers both keep acknowledging the same segment for ever. (See the file attached.) The peer is a Linksys router that have worked correctly for a while. The problem arises only with it, I can successfully connect to a NetBSD and a Windows host. I've attached the dump output. Feel free to ask me for more infos. Note that automatic TCP socket buffer sizing is disabled (the same happens when enabled). I've also disabled rxcsum and txcsum on my network adapter to narrow the possible sources of the problem. Regards, -- Jeremie Le Hen < jeremie at le-hen dot org >< ttz at chchile dot org > --d8Lz2Tf5e5STOWUP Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="tcp.dump" 09:14:57.593729 IP (tos 0x0, ttl 64, id 27791, offset 0, flags [DF], proto: TCP (6), length: 64) 192.168.1.3.56556 > 192.168.1.1.80: S, cksum 0xe59c (correct), 487760288:487760288(0) win 65535 <mss 1460,nop,wscale 8,nop,nop,timestamp 54669015 0,sackOK,eol> 09:14:57.597224 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto: TCP (6), length: 60) 192.168.1.1.80 > 192.168.1.3.56556: S, cksum 0xe603 (correct), 2303804549:2303804549(0) ack 487760289 win 5792 <mss 1460,sackOK,timestamp 76829 54669015,nop,wscale 0> 09:14:57.597306 IP (tos 0x0, ttl 64, id 2460, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.3.56556 > 192.168.1.1.80: ., cksum 0x2a62 (correct), 1:1(0) ack 1 win 260 <nop,nop,timestamp 54669018 76829> 09:14:57.601590 IP (tos 0x0, ttl 64, id 48542, offset 0, flags [DF], proto: TCP (6), length: 488) 192.168.1.3.56556 > 192.168.1.1.80: P 1:437(436) ack 1 win 260 <nop,nop,timestamp 54669023 76829> 09:14:57.602390 IP (tos 0x0, ttl 64, id 26779, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.1.80 > 192.168.1.3.56556: ., cksum 0x108d (correct), 1:1(0) ack 437 win 6432 <nop,nop,timestamp 76829 54669023> 09:14:57.605968 IP (tos 0x0, ttl 64, id 26780, offset 0, flags [DF], proto: TCP (6), length: 308) 192.168.1.1.80 > 192.168.1.3.56556: P 1:257(256) ack 437 win 6432 <nop,nop,timestamp 76829 54669023> 09:14:57.613414 IP (tos 0x0, ttl 64, id 26781, offset 0, flags [DF], proto: TCP (6), length: 1500) 192.168.1.1.80 > 192.168.1.3.56556: . 257:1705(1448) ack 437 win 6432 <nop,nop,timestamp 76830 54669023> 09:14:57.613465 IP (tos 0x0, ttl 64, id 38624, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.3.56556 > 192.168.1.1.80: ., cksum 0x21fb (correct), 437:437(0) ack 1705 win 254 <nop,nop,timestamp 54669035 76829> 09:14:57.816442 IP (tos 0x0, ttl 64, id 26782, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.1.80 > 192.168.1.3.56556: ., cksum 0x09c4 (correct), 1704:1704(0) ack 437 win 6432 <nop,nop,timestamp 76851 54669035> 09:14:57.816489 IP (tos 0x0, ttl 64, id 4315, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.3.56556 > 192.168.1.1.80: ., cksum 0x212a (correct), 437:437(0) ack 1705 win 260 <nop,nop,timestamp 54669238 76829> 09:14:58.236395 IP (tos 0x0, ttl 64, id 26783, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.1.80 > 192.168.1.3.56556: ., cksum 0x08cf (correct), 1704:1704(0) ack 437 win 6432 <nop,nop,timestamp 76893 54669238> 09:14:58.236448 IP (tos 0x0, ttl 64, id 48004, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.3.56556 > 192.168.1.1.80: ., cksum 0x1f86 (correct), 437:437(0) ack 1705 win 260 <nop,nop,timestamp 54669658 76829> 09:14:59.076354 IP (tos 0x0, ttl 64, id 26784, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.1.80 > 192.168.1.3.56556: ., cksum 0x06d7 (correct), 1704:1704(0) ack 437 win 6432 <nop,nop,timestamp 76977 54669658> 09:14:59.076403 IP (tos 0x0, ttl 64, id 4302, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.3.56556 > 192.168.1.1.80: ., cksum 0x1c3e (correct), 437:437(0) ack 1705 win 260 <nop,nop,timestamp 54670498 76829> 09:15:00.756298 IP (tos 0x0, ttl 64, id 26785, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.1.80 > 192.168.1.3.56556: ., cksum 0x02e7 (correct), 1704:1704(0) ack 437 win 6432 <nop,nop,timestamp 77145 54670498> 09:15:00.756344 IP (tos 0x0, ttl 64, id 47006, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.3.56556 > 192.168.1.1.80: ., cksum 0x15ae (correct), 437:437(0) ack 1705 win 260 <nop,nop,timestamp 54672178 76829> 09:15:04.116021 IP (tos 0x0, ttl 64, id 26786, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.1.80 > 192.168.1.3.56556: ., cksum 0xfb06 (correct), 1704:1704(0) ack 437 win 6432 <nop,nop,timestamp 77481 54672178> 09:15:04.116068 IP (tos 0x0, ttl 64, id 63692, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.3.56556 > 192.168.1.1.80: ., cksum 0x088e (correct), 437:437(0) ack 1705 win 260 <nop,nop,timestamp 54675538 76829> --d8Lz2Tf5e5STOWUP--
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