Date: Thu, 20 May 2004 12:40:27 -0700 From: Ulf Zimmermann <ulf@Alameda.net> To: hackers@FreeBSD.org Subject: Problem with a 5.2.1 system and downloading Message-ID: <20040520194027.GH58545@seven.alameda.net>
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I got in my office two machines. One works fine, the other doesn't. Office has a Netscreen-10 as firewall which connects then to a Cisco with a T1 Frame Relay to the Internet. One machine is 4.9-REL and it works like a charm. The other is a 5.2.1-REL (cvsup'ed to latest today). It has a single CPU, PAE kernel (6GB memory). This 5 machine hangs often at different spots during fetch for ports. Today I captured the tcp connections and here is what it shows: Initial TCP setup: 12:26:25.895246 10.1.42.42.49190 > 128.125.253.59.80: S 3565497776:3565497776(0) win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 88945 0> (DF) 12:26:25.919572 128.125.253.59.80 > 10.1.42.42.49190: S 1889662716:1889662716(0) ack 3565497777 win 5840 <mss 1460,nop,wscale 0> (DF) 12:26:25.919592 10.1.42.42.49190 > 128.125.253.59.80: . ack 1 win 32850 (DF) Now follows the HTTP request to download a file (part of linux_base-8 in this case) ... Here are the last 4 packets back and forth going correctly: 12:26:29.052678 128.125.253.59.80 > 10.1.42.42.49190: . 487518:488978(1460) ack 194 win 5840 (DF) 12:26:29.052689 10.1.42.42.49190 > 128.125.253.59.80: . ack 424738 win 32850 (DF) 12:26:29.060577 128.125.253.59.80 > 10.1.42.42.49190: . 488978:490438(1460) ack 194 win 5840 (DF) 12:26:29.060589 10.1.42.42.49190 > 128.125.253.59.80: . ack 424738 win 32850 (DF) And now the last data packet comes in: 12:26:29.069061 128.125.253.59.80 > 10.1.42.42.49190: . 424738:426198(1460) ack 194 win 5840 (DF) And now look at the ack: 12:26:29.069087 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 0 (DF) 12:26:29.069250 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 1790 (DF) 12:26:29.069342 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 3326 (DF) 12:26:29.069461 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 4862 (DF) 12:26:29.069491 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 6398 (DF) 12:26:29.069530 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 7934 (DF) 12:26:29.069559 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 9470 (DF) 12:26:29.069585 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 11006 (DF) 12:26:29.069689 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 12542 (DF) 12:26:29.069719 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 14078 (DF) 12:26:29.069748 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 15614 (DF) 12:26:29.069772 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 17150 (DF) 12:26:29.069809 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 18686 (DF) 12:26:29.069878 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 20222 (DF) 12:26:29.069907 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 21758 (DF) 12:26:29.069932 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 23294 (DF) 12:26:29.069970 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 24830 (DF) 12:26:29.069999 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 26366 (DF) 12:26:29.070064 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 27902 (DF) 12:26:29.070092 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 29438 (DF) 12:26:29.070127 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 30974 (DF) 12:26:29.070155 10.1.42.42.49190 > 128.125.253.59.80: . ack 490438 win 32510 (DF) 35 seconds later I press CTRL-C: 12:27:04.113639 10.1.42.42.49190 > 128.125.253.59.80: F 194:194(0) ack 490438 win 32850 (DF) 12:27:04.353830 10.1.42.42.49190 > 128.125.253.59.80: F 194:194(0) ack 490438 win 32850 (DF) 12:27:04.653851 10.1.42.42.49190 > 128.125.253.59.80: F 194:194(0) ack 490438 win 32850 (DF) ... So does this look normal to anyone ? -- Regards, Ulf. --------------------------------------------------------------------- Ulf Zimmermann, 1525 Pacific Ave., Alameda, CA-94501, #: 510-865-0204 You can find my resume at: http://seven.Alameda.net/~ulf/resume.html
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