[6bone] problem with ftp.netbsd.org

[Pim van Pelt]

On Thu, Jun 13, 2002 at 08:51:12PM -0700, Stephen Stuart wrote:
| If anyone is still having problems with TCP sessions to/from
| ftp.netbsd.org, please send me traceroutes.

The MTU and tunnel setttings are unrelated. A TCP handshake uses
Syn/SynAck/Ack packets without payload so these should be around 50
bytes.

Stephen, I still cannot reach the site, from various Dutch ISPs, such as
SURFnet (AS1103), Intouch (AS8954), BIT (AS12859) and Concepts
(AS12871).

A typical traceroute for AS12859 would be:
[HoG] /hog.mnt/vol2/rsync/bfib/www$ traceroute6 ftp.netbsd.org
traceroute6 to ftp.netbsd.org (3ffe:8050:201:1860:2a0:c9ff:feed:b7ea)
	from 2001:7b8:3:17:2a0:24ff:fe56:6a60, 30 hops max, 12 byte packets
1  dapje.ipv6.network.bit.nl  1.169 ms  1.117 ms  1 ms
2  c7206.sara.ams-ix.ipv6.network.bit.nl  10.336 ms  9.678 ms 10.765 ms
3  ams-ix.sara.xs4all.net  10.653 ms  13.089 ms  11.801 ms
4  Gi1-2.BR1.Amsterdam1.surf.net  13.195 ms *  10.898 ms
5  nikhef.ams-ix.ipv6.intouch.net  9.658 ms  9.855 ms  9.633 ms
6  3ffe:800::fffb:0:0:5  168.34 ms  169.399 ms *
7  3ffe:800::fff9:0:0:2  343.838 ms  278.082 ms  189.127 ms
8  3ffe:8050:ffff::fffd  181.536 ms  178.031 ms  179.648 ms
9  ftp6.netbsd.org  178.405 ms  182.943 ms  179.327 ms

And directly from AS8954 (intouch.net):
pim@tunnelserver:~$ traceroute6 ftp.netbsd.org
traceroute6 to ftp.netbsd.org (3ffe:8050:201:1860:2a0:c9ff:feed:b7ea)
	from 2001:6e0::250:4ff:fe4a:7708, 30 hops max, 16 byte packets
1  Amsterdam.core.ipv6.intouch.net (2001:6e0::2)  0.522 ms  0.423 ms  0.389 ms
2  3ffe:800::fffb:0:0:5 (3ffe:800::fffb:0:0:5)  159.983 ms * 158.36 ms
3  3ffe:800::fff9:0:0:2 (3ffe:800::fff9:0:0:2)  167.842 ms 167.723 ms  167.985 ms
4  3ffe:8050:ffff::fffd (3ffe:8050:ffff::fffd)  169.695 ms 169.222 ms  169.645 ms
5  ftp6.netbsd.org (3ffe:8050:201:1860:2a0:c9ff:feed:b7ea) 169.245 ms  169.039 ms  169.31 ms

As Ronald has also witnessed, I see Syn, then SynAck, then I send Ack
and the line goes dead (does this Ack ever reach the ftp6 server?).

It also raises another point, which I find quite odd. I will mail about
this later.

groet,
Pim
--
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Pim van Pelt                 Email: pim@ipng.nl
http://www.ipng.nl/             IPv6 Deployment
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