[6bone] problem with ftp.netbsd.org

[Simon Leinen]

>>>>> On Fri, 14 Jun 2002 09:51:07 +0900, itojun@iijlab.net said:
> 	there seems to be some config mistake within ISI (who hosts
> 	tp.netbsd.org), regarding to link MTU setting of tunnel
> 	interface.  i heard that they have changed the config so it
> 	should be better now.  (at least, it is much better for me)

Yes, but that shouldn't matter early on in the FTP session - the first
packets are all quite small.

By the way, for me it works fine from a Solaris 8 machine, although
the problem may simply have been fixed in the meantime.  I'm appending
tcpdump output from a complete session.

> 	i myself have experienced it before - Juniper sets tunnel
> 	interface MTU to infinity, and KAME uses 1280.

-- 
Simon Leinen				       simon@babar.switch.ch
SWITCH				   http://www.switch.ch/misc/leinen/

	       Computers hate being anthropomorphized.

10:30:42.770049 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: S [tcp sum ok] 3717258812:3717258812(0) win 32805 <nop,wscale 5,nop,nop,timestamp 240376687 0,nop,nop,sackOK,mss 1440> (len 44, hlim 60)
10:30:42.967472 ftp6.netbsd.org.ftp > babar.switch.ch.41522: S [tcp sum ok] 4094757220:4094757220(0) ack 3717258813 win 32768 <mss 1440,nop,wscale 0,nop,nop,timestamp 8691918 240376687> (len 40, hlim 56)
10:30:42.967502 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 1 win 32844 <nop,nop,timestamp 240376707 8691918> (len 32, hlim 60)
10:30:43.328349 ftp6.netbsd.org.ftp > babar.switch.ch.41522: P [tcp sum ok] 1:63(62) ack 1 win 33120 <nop,nop,timestamp 8691919 0> [flowlabel 0xf4865] (len 94, hlim 56)
10:30:43.328382 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 63 win 32844 <nop,nop,timestamp 240376743 8691919> (len 32, hlim 60)
10:30:46.236393 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: P [tcp sum ok] 1:11(10) ack 63 win 32844 <nop,nop,timestamp 240377034 8691919> (len 42, hlim 60)
10:30:46.432911 ftp6.netbsd.org.ftp > babar.switch.ch.41522: P [tcp sum ok] 63:112(49) ack 11 win 33120 <nop,nop,timestamp 8691925 240377034> [flowlabel 0xf4865] (len 81, hlim 56)
10:30:46.524524 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 112 win 32844 <nop,nop,timestamp 240377063 8691925> (len 32, hlim 60)
10:30:48.130238 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: P [tcp sum ok] 11:33(22) ack 112 win 32844 <nop,nop,timestamp 240377223 8691925> (len 54, hlim 60)
10:30:48.430036 ftp6.netbsd.org.ftp > babar.switch.ch.41522: . [tcp sum ok] ack 33 win 33120 <nop,nop,timestamp 8691929 240377223> [flowlabel 0xf4865] (len 32, hlim 56)
10:30:48.471005 ftp6.netbsd.org.ftp > babar.switch.ch.41522: P [tcp sum ok] 112:118(6) ack 33 win 33120 <nop,nop,timestamp 8691929 240377223> [flowlabel 0xf4865] (len 38, hlim 56)
10:30:48.564520 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 118 win 32844 <nop,nop,timestamp 240377267 8691929> (len 32, hlim 60)
10:30:48.585777 ftp6.netbsd.org.ftp > babar.switch.ch.41522: . [tcp sum ok] 118:1326(1208) ack 33 win 33120 <nop,nop,timestamp 8691929 240377223> [flowlabel 0xf4865] (len 1240, hlim 56)
10:30:48.684532 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 1326 win 32844 <nop,nop,timestamp 240377279 8691929> (len 32, hlim 60)
10:30:48.886186 ftp6.netbsd.org.ftp > babar.switch.ch.41522: P [tcp sum ok] 1326:1762(436) ack 33 win 33120 <nop,nop,timestamp 8691930 240377223> [flowlabel 0xf4865] (len 468, hlim 56)
10:30:48.984524 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 1762 win 32844 <nop,nop,timestamp 240377309 8691930> (len 32, hlim 60)
10:30:49.184436 ftp6.netbsd.org.ftp > babar.switch.ch.41522: P [tcp sum ok] 1762:2491(729) ack 33 win 33120 <nop,nop,timestamp 8691930 240377223> [flowlabel 0xf4865] (len 761, hlim 56)
10:30:49.284539 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 2491 win 32844 <nop,nop,timestamp 240377339 8691930> (len 32, hlim 60)
10:30:50.446337 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: P [tcp sum ok] 33:39(6) ack 2491 win 32844 <nop,nop,timestamp 240377455 8691930> (len 38, hlim 60)
10:30:50.642775 ftp6.netbsd.org.ftp > babar.switch.ch.41522: P [tcp sum ok] 2491:2539(48) ack 39 win 33120 <nop,nop,timestamp 8691933 240377455> [flowlabel 0xf4865] (len 80, hlim 56)
10:30:50.643278 babar.switch.ch.41523 > ftp6.netbsd.org.49202: S [tcp sum ok] 3014599293:3014599293(0) win 32805 <nop,wscale 5,nop,nop,timestamp 240377474 0,nop,nop,sackOK,mss 1440> (len 44, hlim 60)
10:30:50.734548 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 2539 win 32844 <nop,nop,timestamp 240377484 8691933> (len 32, hlim 60)
10:30:50.838925 ftp6.netbsd.org.49202 > babar.switch.ch.41523: S [tcp sum ok] 823416627:823416627(0) ack 3014599294 win 32768 <mss 1440,nop,wscale 0,nop,nop,timestamp 8691934 240377474> (len 40, hlim 56)
10:30:50.838956 babar.switch.ch.41523 > ftp6.netbsd.org.49202: . [tcp sum ok] ack 1 win 32844 <nop,nop,timestamp 240377494 8691934> (len 32, hlim 60)
10:30:50.839146 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: P [tcp sum ok] 39:45(6) ack 2539 win 32844 <nop,nop,timestamp 240377494 8691933> (len 38, hlim 60)
10:30:51.039516 ftp6.netbsd.org.ftp > babar.switch.ch.41522: P [tcp sum ok] 2539:2594(55) ack 45 win 33120 <nop,nop,timestamp 8691934 240377494> [flowlabel 0xf4865] (len 87, hlim 56)
10:30:51.134569 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 2594 win 32844 <nop,nop,timestamp 240377524 8691934> (len 32, hlim 60)
10:30:51.385422 ftp6.netbsd.org.49202 > babar.switch.ch.41523: F [tcp sum ok] 516:516(0) ack 1 win 33120 <nop,nop,timestamp 8691935 0> [flowlabel 0xf4866] (len 32, hlim 56)
10:30:51.385451 babar.switch.ch.41523 > ftp6.netbsd.org.49202: . [tcp sum ok] ack 1 win 32844 <nop,nop,timestamp 240377549 8691934> (len 32, hlim 60)
10:30:51.386884 ftp6.netbsd.org.ftp > babar.switch.ch.41522: P [tcp sum ok] 2594:2618(24) ack 45 win 33120 <nop,nop,timestamp 8691935 240377494> [flowlabel 0xf4865] (len 56, hlim 56)
10:30:51.389623 ftp6.netbsd.org.49202 > babar.switch.ch.41523: P [tcp sum ok] 1:516(515) ack 1 win 33120 <nop,nop,timestamp 8691935 0> [flowlabel 0xf4866] (len 547, hlim 56)
10:30:51.389735 babar.switch.ch.41523 > ftp6.netbsd.org.49202: . [tcp sum ok] ack 517 win 32844 <nop,nop,timestamp 240377549 8691935> (len 32, hlim 60)
10:30:51.393974 babar.switch.ch.41523 > ftp6.netbsd.org.49202: F [tcp sum ok] 1:1(0) ack 517 win 32844 <nop,nop,timestamp 240377549 8691935> (len 32, hlim 60)
10:30:51.484554 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 2618 win 32844 <nop,nop,timestamp 240377559 8691935> (len 32, hlim 60)
10:30:51.587775 ftp6.netbsd.org.49202 > babar.switch.ch.41523: . [tcp sum ok] ack 2 win 33120 <nop,nop,timestamp 8691935 240377549> [flowlabel 0xf4866] (len 32, hlim 56)
10:30:52.120699 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: P [tcp sum ok] 45:51(6) ack 2618 win 32844 <nop,nop,timestamp 240377622 8691935> (len 38, hlim 60)
10:30:52.320393 ftp6.netbsd.org.ftp > babar.switch.ch.41522: P [tcp sum ok] 2618:2624(6) ack 51 win 33120 <nop,nop,timestamp 8691937 240377622> [flowlabel 0xf4865] (len 38, hlim 56)
10:30:52.322111 ftp6.netbsd.org.ftp > babar.switch.ch.41522: FP [tcp sum ok] 2624:2810(186) ack 51 win 33120 <nop,nop,timestamp 8691937 240377622> [flowlabel 0xf4865] (len 218, hlim 56)
10:30:52.322233 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: . [tcp sum ok] ack 2811 win 32844 <nop,nop,timestamp 240377642 8691937> (len 32, hlim 60)
10:30:52.322846 babar.switch.ch.41522 > ftp6.netbsd.org.ftp: F [tcp sum ok] 51:51(0) ack 2811 win 32844 <nop,nop,timestamp 240377642 8691937> (len 32, hlim 60)
10:30:52.518550 ftp6.netbsd.org.ftp > babar.switch.ch.41522: . [tcp sum ok] ack 52 win 33120 <nop,nop,timestamp 8691937 240377642> [flowlabel 0xf4865] (len 32, hlim 56)