Date: Thu, 11 Feb 2010 10:57:16 +0100 From: n j <nino80@gmail.com> To: User Questions <freebsd-questions@freebsd.org> Subject: Superfluous ACK and RST packets after terminating connection Message-ID: <92bcbda51002110157i36bd25d7wad9a9f16df2ebaf5@mail.gmail.com>
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Hi all, I was debugging some problems with an application and noticed some strange behavior that I can only attribute to possible problems in TCP/IP stack which OTOH I consider unlikely. I'd appreciate any pointers towards why are there extra packets? - in case of successful connection: 14:52:57.866040 IP client.example.net.6524 > server.example.net.9002: S 813851098:813851098(0) win 8192 <mss 1380,nop,wscale 2,nop,nop,sackOK> 14:52:57.866057 IP server.example.net.9002 > client.example.net.6524: S 3888621507:3888621507(0) ack 813851099 win 65535 <mss 1380,nop,wscale 3,sackOK,eol> 14:52:57.867143 IP client.example.net.6524 > server.example.net.9002: . ack 3888621508 win 16560 14:52:57.868333 IP client.example.net.6524 > server.example.net.9002: P 813851099:813852180(1081) ack 3888621508 win 16560 14:52:57.967858 IP server.example.net.9002 > client.example.net.6524: . ack 813852180 win 8144 14:53:35.533165 IP server.example.net.9002 > client.example.net.6524: P 3888621508:3888621542(34) ack 813852180 win 8144 14:53:35.564542 IP server.example.net.9002 > client.example.net.6524: FP 3888621542:3888621675(133) ack 813852180 win 8280 14:53:35.566228 IP client.example.net.6524 > server.example.net.9002: . ack 3888621676 win 16518 14:53:35.566289 IP client.example.net.6524 > server.example.net.9002: F 813852180:813852180(0) ack 3888621676 win 16518 14:53:35.566318 IP server.example.net.9002 > client.example.net.6524: . ack 813852181 win 8279 [what are these???] 14:53:36.172081 IP server.example.net.9002 > client.example.net.6524: . ack 813852180 win 0 14:53:36.172101 IP server.example.net.9002 > client.example.net.6524: . ack 813852181 win 8279 - in case of unsuccessful connection: 14:53:00.411337 IP client.example.net.6547 > server.example.net.9002: S 1055031875:1055031875(0) win 8192 <mss 1380,nop,wscale 2,nop,nop,sackOK> 14:53:00.411354 IP server.example.net.9002 > client.example.net.6547: S 2849043653:2849043653(0) ack 1055031876 win 65535 <mss 1380,nop,wscale 3,sackOK,eol> 14:53:00.412242 IP client.example.net.6547 > server.example.net.9002: . ack 2849043654 win 16560 14:53:00.412251 IP server.example.net.9002 > client.example.net.6547: R 2849043654:2849043654(0) win 0 [what are these???] 14:53:01.168076 IP server.example.net.9002 > client.example.net.6547: . ack 1055031876 win 0 14:53:01.168100 IP server.example.net.9002 > client.example.net.6547: R 2849043654:2849043654(0) win 0 14:53:01.168393 IP client.example.net.6547 > server.example.net.9002: R 1055031876:1055031876(0) ack 2849043653 win 0 The server is running 7.2 GENERIC (client is WinXP). I did some googling and the only (somewhat) related thing I found is this post from July 2009: Stray RST packets on 7.2-RELEASE - http://lists.freebsd.org/pipermail/freebsd-stable/2009-July/051357.html Thanks, -- Nino
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