Date: Fri, 18 Apr 2008 15:13:18 +0200 From: Holger Kipp <hk@alogis.com> To: stable@freebsd.org Subject: connection reset after second syn-ack was sent (FreeBSD 7.0) Message-ID: <20080418131318.GA27272@intserv.int1.b.intern>
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Hello, I have a little problem here that is driving me nuts: I occasionally experience the following: 2008-04-18 10:38:46.454495 IP 192.168.1.1.55784 > 192.168.188.188.515: S 2765551688:2765551688(0) win 32768 <mss 1460,wscale 0,nop> 2008-04-18 10:38:46.454507 IP 192.168.188.188.515 > 192.168.1.1.55784: S 3468383339:3468383339(0) ack 2765551689 win 65535 <mss 1460,nop,wscale 3> 2008-04-18 10:38:49.453868 IP 192.168.188.188.515 > 192.168.1.1.55784: S 3468383339:3468383339(0) ack 2765551689 win 65535 <mss 1460,nop,wscale 3> 2008-04-18 10:38:49.722767 IP 192.168.1.1.55784 > 192.168.188.188.515: . ack 1 win 32768 2008-04-18 10:38:49.722786 IP 192.168.188.188.515 > 192.168.1.1.55784: R 3468383340:3468383340(0) win 0 2008-04-18 10:38:49.727926 IP 192.168.1.1.55784 > 192.168.188.188.515: P 1:7(6) ack 1 win 32768 2008-04-18 10:38:49.819709 IP 192.168.188.188.515 > 192.168.1.1.55784: P 1:2(1) ack 7 win 65535 2008-04-18 10:38:50.006543 IP 192.168.1.1.55784 > 192.168.188.188.515: R 2765551695:2765551695(0) win 0 and 2008-04-18 15:30:31.256246 IP 192.168.1.1.53597 > 192.168.188.188.515: S 1236263266:1236263266(0) win 32768 <mss 1460,wscale 0,nop> 2008-04-18 15:30:31.256257 IP 192.168.188.188.515 > 192.168.1.1.53597: S 559988198:559988198(0) ack 1236263267 win 65535 <mss 1460,nop,wscale 3> 2008-04-18 15:30:34.255479 IP 192.168.188.188.515 > 192.168.1.1.53597: S 559988198:559988198(0) ack 1236263267 win 65535 <mss 1460,nop,wscale 3> 2008-04-18 15:30:34.440092 IP 192.168.1.1.53597 > 192.168.188.188.515: . ack 1 win 32768 2008-04-18 15:30:34.440112 IP 192.168.188.188.515 > 192.168.1.1.53597: R 559988199:559988199(0) win 0 2008-04-18 15:30:34.496849 IP 192.168.1.1.53597 > 192.168.188.188.515: P 1:7(6) ack 1 win 32768 2008-04-18 15:30:34.596461 IP 192.168.188.188.515 > 192.168.1.1.53597: . ack 7 win 65535 2008-04-18 15:30:34.620914 IP 192.168.188.188.515 > 192.168.1.1.53597: P 1:2(1) ack 7 win 65535 2008-04-18 15:30:34.780723 IP 192.168.1.1.53597 > 192.168.188.188.515: R 1236263273:1236263273(0) win 0 2008-04-18 15:30:34.804966 IP 192.168.1.1.53597 > 192.168.188.188.515: R 1236263273:1236263273(0) win 0 (IP addresses changed to protect the innocent ;-) Can anyone enlighten me as to why the freebsd printserver (192.168.188.188) is sending a reset after ack had been received - this only happens if no answer was received for the first syn-ack reply, so a second one is send out? System is 7.0-RELEASE out of the box on a single-processor 2.4GHz P4 Compaq with 1 GB main memory, with lpd configured. Here the usual behaviour (I would expect this to be the same even with two syn-acks send back): 2008-04-18 10:38:47.921055 IP 192.168.1.1.55786 > 192.168.188.188.515: S 2765866087:2765866087(0) win 32768 <mss 1460,wscale 0,nop> 2008-04-18 10:38:47.921081 IP 192.168.188.188.515 > 192.168.1.1.55786: S 4178311531:4178311531(0) ack 2765866088 win 65535 <mss 1460,nop,wscale 3> 2008-04-18 10:38:48.389707 IP 192.168.1.1.55786 > 192.168.188.188.515: P 1:7(6) ack 1 win 32768 2008-04-18 10:38:48.488906 IP 192.168.188.188.515 > 192.168.1.1.55786: . ack 7 win 8211 2008-04-18 10:38:49.760593 IP 192.168.188.188.515 > 192.168.1.1.55786: P 1:2(1) ack 7 win 8212 2008-04-18 10:38:49.945735 IP 192.168.1.1.55786 > 192.168.188.188.515: P 7:26(19) ack 2 win 32768 2008-04-18 10:38:49.946002 IP 192.168.188.188.515 > 192.168.1.1.55786: P 2:3(1) ack 26 win 8212 2008-04-18 10:38:50.236467 IP 192.168.1.1.55786 > 192.168.188.188.515: P 26:1050(1024) ack 3 win 32768 2008-04-18 10:38:50.244742 IP 192.168.1.1.55786 > 192.168.188.188.515: P 1050:2074(1024) ack 3 win 32768 2008-04-18 10:38:50.244762 IP 192.168.188.188.515 > 192.168.1.1.55786: . ack 2074 win 8084 2008-04-18 10:38:50.253217 IP 192.168.1.1.55786 > 192.168.188.188.515: P 2074:3098(1024) ack 3 win 32768 2008-04-18 10:38:50.261559 IP 192.168.1.1.55786 > 192.168.188.188.515: P 3098:4122(1024) ack 3 win 32768 2008-04-18 10:38:50.261571 IP 192.168.188.188.515 > 192.168.1.1.55786: . ack 4122 win 8084 [..] 2008-04-18 10:38:51.236260 IP 192.168.1.1.55786 > 192.168.188.188.515: P 26200:26201(1) ack 5 win 32768 2008-04-18 10:38:51.236271 IP 192.168.188.188.515 > 192.168.1.1.55786: . ack 26201 win 8212 2008-04-18 10:38:51.236289 IP 192.168.188.188.515 > 192.168.1.1.55786: P 5:6(1) ack 26201 win 8212 2008-04-18 10:38:51.539638 IP 192.168.1.1.55786 > 192.168.188.188.515: F 26201:26201(0) ack 6 win 32768 2008-04-18 10:38:51.539667 IP 192.168.188.188.515 > 192.168.1.1.55786: . ack 26202 win 8212 2008-04-18 10:38:51.539713 IP 192.168.188.188.515 > 192.168.1.1.55786: P 6:7(1) ack 26202 win 8212 2008-04-18 10:38:51.540199 IP 192.168.188.188.515 > 192.168.1.1.55786: F 7:7(0) ack 26202 win 8212 2008-04-18 10:38:51.751202 IP 192.168.1.1.55786 > 192.168.188.188.515: R 2765892289:2765892289(0) win 32768 2008-04-18 10:38:51.751539 IP 192.168.1.1.55786 > 192.168.188.188.515: R 2765892289:2765892289(0) win 0 Best regards, Holger Kipp
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