From owner-freebsd-hackers Thu May 29 13:18:11 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id NAA06668 for hackers-outgoing; Thu, 29 May 1997 13:18:11 -0700 (PDT) Received: from alpha.xerox.com (alpha.Xerox.COM [13.1.64.93]) by hub.freebsd.org (8.8.5/8.8.5) with SMTP id NAA06663 for ; Thu, 29 May 1997 13:18:08 -0700 (PDT) Received: from crevenia.parc.xerox.com ([13.2.116.11]) by alpha.xerox.com with SMTP id <16622(12)>; Thu, 29 May 1997 13:17:36 PDT Received: from localhost by crevenia.parc.xerox.com with SMTP id <177489>; Thu, 29 May 1997 13:17:31 -0700 To: Chris Csanady cc: hackers@freebsd.org Subject: Re: TCP/IP bug? Unnecessary fragmentation... In-reply-to: Your message of "Wed, 28 May 97 19:49:39 PDT." <199705290249.VAA01968@friley01.res.iastate.edu> Date: Thu, 29 May 1997 13:17:17 PDT From: Bill Fenner Message-Id: <97May29.131731pdt.177489@crevenia.parc.xerox.com> Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Another oddity is that if you close the connection immediately, for the same data sizes that it does this odd fragmentation (100 < S < 208), the FIN is piggybacked on the 2nd data segment. This doesn't happen with any other data size. Bill 200 bytes: 20:07:36.948660 sundae.1156 > crevenia.discard: S 3914627240:3914627240(0) win 16384 (DF) 20:07:36.950164 crevenia.discard > sundae.1156: S 703872000:703872000(0) ack 3914627241 win 4096 20:07:36.950390 sundae.1156 > crevenia.discard: . ack 1 win 17520 (DF) 20:07:36.950722 sundae.1156 > crevenia.discard: P 1:101(100) ack 1 win 17520 (DF) 20:07:36.951096 sundae.1156 > crevenia.discard: FP 101:201(100) ack 1 win 17520 (DF) 20:07:36.951753 crevenia.discard > sundae.1156: . ack 202 win 3896 20:07:36.965928 crevenia.discard > sundae.1156: F 1:1(0) ack 202 win 4096 20:07:36.966140 sundae.1156 > crevenia.discard: . ack 2 win 17520 (DF) 1024 bytes: 20:07:57.229256 sundae.1159 > crevenia.discard: S 3918727601:3918727601(0) win 16384 (DF) 20:07:57.230772 crevenia.discard > sundae.1159: S 706688000:706688000(0) ack 3918727602 win 4096 20:07:57.231011 sundae.1159 > crevenia.discard: . ack 1 win 17520 (DF) 20:07:57.231796 sundae.1159 > crevenia.discard: P 1:1025(1024) ack 1 win 17520 (DF) 20:07:57.232110 sundae.1159 > crevenia.discard: F 1025:1025(0) ack 1 win 17520 (DF) 20:07:57.233398 crevenia.discard > sundae.1159: . ack 1026 win 3072 20:07:57.242112 crevenia.discard > sundae.1159: F 1:1(0) ack 1026 win 4096 20:07:57.242355 sundae.1159 > crevenia.discard: . ack 2 win 17520 (DF) 2048 bytes: 20:08:02.212852 sundae.1160 > crevenia.discard: S 3919846017:3919846017(0) win 16384 (DF) 20:08:02.214375 crevenia.discard > sundae.1160: S 707392000:707392000(0) ack 3919846018 win 4096 20:08:02.214608 sundae.1160 > crevenia.discard: . ack 1 win 17520 (DF) 20:08:02.215719 sundae.1160 > crevenia.discard: . 1:1461(1460) ack 1 win 17520 (DF) 20:08:02.216294 sundae.1160 > crevenia.discard: P 1461:2049(588) ack 1 win 17520 (DF) 20:08:02.216629 sundae.1160 > crevenia.discard: F 2049:2049(0) ack 1 win 17520 (DF) 20:08:02.217980 crevenia.discard > sundae.1160: . ack 2050 win 2048 20:08:02.229945 crevenia.discard > sundae.1160: . ack 2050 win 4096 20:08:02.231652 crevenia.discard > sundae.1160: F 1:1(0) ack 2050 win 4096 20:08:02.231843 sundae.1160 > crevenia.discard: . ack 2 win 17520 (DF)