[6bone] problem with ftp.netbsd.org

[Ronald van der Pol]

I cannot ftp to ftp.bsd.org:

spock$ ftp ftp.netbsd.org
Connected to ftp.netbsd.org.
<no further output>

Tcpdump shows (spock is 2001:610:508:1001:260:1dff:fef6:7ff9):

00:37:02.458730 2001:610:508:1001:260:1dff:fef6:7ff9.1310 > 3ffe:8050:201:1860:2a0:c9ff:feed:b7ea.21: S [tcp sum ok] 3384697445:3384697445(0) win 57344 <mss 1440,nop,wscale 0,nop,nop,timestamp 5546340 0> (len 40, hlim 64)
00:37:02.764566 3ffe:8050:201:1860:2a0:c9ff:feed:b7ea.21 > 2001:610:508:1001:260:1dff:fef6:7ff9.1310: S [tcp sum ok] 131386982:131386982(0) ack 3384697446 win 32768 <mss 1440,nop,wscale 0,nop,nop,timestamp 8620681 5546340> (len 40, hlim 54)
00:37:02.764799 2001:610:508:1001:260:1dff:fef6:7ff9.1310 > 3ffe:8050:201:1860:2a0:c9ff:feed:b7ea.21: . [tcp sum ok] 1:1(0) ack 1 win 58548 <nop,nop,timestamp 5546370 8620681> (len 32, hlim 64)
00:37:10.547821 2001:610:508:1001:260:1dff:fef6:7ff9.1308 > 3ffe:8050:201:1860:2a0:c9ff:feed:b7ea.21: F [tcp sum ok] 1:1(0) ack 1 win 58548 <nop,nop,timestamp 5547149 8619797> (len 32, hlim 64)
00:38:14.548802 2001:610:508:1001:260:1dff:fef6:7ff9.1308 > 3ffe:8050:201:1860:2a0:c9ff:feed:b7ea.21: F [tcp sum ok] 1:1(0) ack 1 win 58548 <nop,nop,timestamp 5553549 8619797> (len 32, hlim 64)
00:39:18.549774 2001:610:508:1001:260:1dff:fef6:7ff9.1308 > 3ffe:8050:201:1860:2a0:c9ff:feed:b7ea.21: F [tcp sum ok] 1:1(0) ack 1 win 58548 <nop,nop,timestamp 5559949 8619797> (len 32, hlim 64)
00:40:22.550736 2001:610:508:1001:260:1dff:fef6:7ff9.1308 > 3ffe:8050:201:1860:2a0:c9ff:feed:b7ea.21: F [tcp sum ok] 1:1(0) ack 1 win 58548 <nop,nop,timestamp 5566349 8619797> (len 32, hlim 64)
00:41:26.551704 2001:610:508:1001:260:1dff:fef6:7ff9.1308 > 3ffe:8050:201:1860:2a0:c9ff:feed:b7ea.21: F [tcp sum ok] 1:1(0) ack 1 win 58548 <nop,nop,timestamp 5572749 8619797> (len 32, hlim 64)
00:42:30.552678 2001:610:508:1001:260:1dff:fef6:7ff9.1308 > 3ffe:8050:201:1860:2a0:c9ff:feed:b7ea.21: F [tcp sum ok] 1:1(0) ack 1 win 58548 <nop,nop,timestamp 5579149 8619797> (len 32, hlim 64)
00:43:34.553613 2001:610:508:1001:260:1dff:fef6:7ff9.1308 > 3ffe:8050:201:1860:2a0:c9ff:feed:b7ea.21: R [tcp sum ok] 2:2(0) ack 1 win 58548 (len 20, hlim 64)

Several people have informed me that they can reach ftp.netbsd.org over
IPv6.

I am thinking about a routing problem from ftp.netbsd.org towards me,
but on the other hand the tcpdump above shows I do get one packet from
ftp.netbsd.org in the handshaking phase.

I tried this on freebsd-stable, netbsd-current and netbsd 1.5.3 with the
same result.

'ftp -4 ftp.netbsd.org' is working fine. v6 ftp to other v6 ftp servers
is also working, so no firewall issues. Traceroute is also working:
spock$ traceroute6 -q 1 -l  ftp.netbsd.org
traceroute6 to ftp.netbsd.org (3ffe:8050:201:1860:2a0:c9ff:feed:b7ea) from 2001:610:508:1001:260:1dff:fef6:7ff9, 30 hops max, 12 byte packets
 1  kirk (2001:610:508:1001:220:afff:fec6:4faa)  3.201 ms
 2  surrogate.ipv6.surfnet.nl (2001:610:508:1000::1)  7.9 ms
 3  surfnet-bv.Amsterdam.ipv6.surf.net (2001:610:0:2001::1)  13.627 ms
 4  PO4-0.CR2.Amsterdam1.surf.net (2001:610:16:3048::49)  16.897 ms
 5  PO0-0.BR2.Amsterdam1.surf.net (2001:610:16:6004::6)  15.136 ms
 6  ams-ix.sara.xs4all.net (2001:7f8:1::a500:3265:1)  13.938 ms
 7  nikhef.ams-ix.ipv6.intouch.net (2001:7f8:1::a500:8954:1)  12.436 ms
 8  3ffe:1280:1001:1::1 (3ffe:1280:1001:1::1)  382.62 ms
 9  3ffe:80a::1 (3ffe:80a::1)  203.762 ms
10  3ffe:8050:ffff::fffd (3ffe:8050:ffff::fffd)  204.275 ms
11  ftp6.netbsd.org (3ffe:8050:201:1860:2a0:c9ff:feed:b7ea)  306.499 ms

Any suggestions what could be wrong here?

	rvdp

PS This is quite annoying because I have the same problem with
www.netbsd.org and I use mozilla-1.0.