[IPv6] reachability of ftp.netbsd.org

igor@nospam.invalid · *nix forums addict Joined: 17 Aug 2005 Posts: 81

Hello.

I have some challenges reaching ftp.netbsd.org; don't know where is
the problem but it looks like a routing problem. Briefly, I cannot
access not only to ftp.netbsd.org but to other servers hosted by
the Internet Systems Consortium and to the ISC itself (in general,
all unreachable servers own IP addresses starting with 2001:4f8: Smile

.

Some examples:

$ ping ftp.netbsd.org
PING ftp.netbsd.org (204.152.190.13): 56 data bytes
64 bytes from 204.152.190.13: icmp_seq=0 ttl=239 time=905.410 ms
64 bytes from 204.152.190.13: icmp_seq=1 ttl=238 time=635.418 ms
64 bytes from 204.152.190.13: icmp_seq=2 ttl=239 time=618.080 ms
64 bytes from 204.152.190.13: icmp_seq=3 ttl=240 time=309.660 ms
^C
----ftp.netbsd.org PING Statistics----
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 309.660/617.142/905.410/243.570 ms

is ok, but...

$ ping6 ftp.netbsd.org
PING6(56=40+8+8 bytes) 2001:5c0:8fff:fffe::21c7 --> 2001:4f8:4:7:2e0:81ff:fe21:6563
^C
--- ftp.netbsd.org ping6 statistics ---
5 packets transmitted, 0 packets received, 100.0% packet loss

For FreeBSD:

$ ping ftp.freebsd.org
PING ftp.freebsd.org (204.152.184.73): 56 data bytes
64 bytes from 204.152.184.73: icmp_seq=0 ttl=48 time=904.654 ms
64 bytes from 204.152.184.73: icmp_seq=1 ttl=47 time=499.286 ms
64 bytes from 204.152.184.73: icmp_seq=2 ttl=47 time=746.321 ms
^C
----ftp.freebsd.org PING Statistics----
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 499.286/716.754/904.654/204.295 ms

but, when using IPv6:

$ ping6 ftp.freebsd.org
PING6(56=40+8+8 bytes) 2001:5c0:8fff:fffe::21c7 --> 2001:4f8:0:2::e
^C
--- ftp.freebsd.org ping6 statistics ---
10 packets transmitted, 0 packets received, 100.0% packet loss

Same happens to ftp.isc.org. No need to provide more examples here.
Other places around the world can be easily reached:

$ ping6 www.ipv6.elmundo.es
PING6(56=40+8+8 bytes) 2001:5c0:8fff:fffe::21c7 --> 2001:450:9:10::71
16 bytes from 2001:450:9:10::71, icmp_seq=0 hlim=59 time=1452.06 ms
16 bytes from 2001:450:9:10::71, icmp_seq=1 hlim=59 time=769.76 ms
16 bytes from 2001:450:9:10::71, icmp_seq=2 hlim=59 time=1203.05 ms
^C
--- imasd.ipv6.elmundo.es ping6 statistics ---
4 packets transmitted, 3 packets received, 25.0% packet loss
round-trip min/avg/max/std-dev = 769.760/1141.622/1452.055/281.912 ms

$ ping6 ftp.kame.net
PING6(56=40+8+8 bytes) 2001:5c0:8fff:fffe::21c7 --> 2001:200:0:8002:203:47ff:fea5:3085
16 bytes from 2001:200:0:8002:203:47ff:fea5:3085, icmp_seq=0 hlim=47 time=1486.95 ms
16 bytes from 2001:200:0:8002:203:47ff:fea5:3085, icmp_seq=1 hlim=47 time=1366.55 ms
16 bytes from 2001:200:0:8002:203:47ff:fea5:3085, icmp_seq=2 hlim=47 time=1395.67 ms
16 bytes from 2001:200:0:8002:203:47ff:fea5:3085, icmp_seq=3 hlim=47 time=600.436 ms
^C
--- ftp.kame.net ping6 statistics ---
5 packets transmitted, 4 packets received, 20.0% packet loss
round-trip min/avg/max/std-dev = 600.436/1212.400/1486.953/356.099 ms

When using FTP, all these places not in the 2001:4f8:: address space
can be reached:

$ ftp ftp.kame.net
Trying 2001:200:0:8002:203:47ff:fea5:3085...
Connected to ftp.kame.net.
220 orange.kame.net FTP server (Version 6.00LS) ready.
Name (ftp.kame.net:sobrado): ftp
331 Guest login ok, send your email address as password.
Password:
230 Guest login ok, access restrictions apply.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp>

But we get a connection timeout for servers hosted by ISC:

$ ftp ftp.netbsd.org
Trying 2001:4f8:4:7:2e0:81ff:fe21:6563...
ftp: connect to address 2001:4f8:4:7:2e0:81ff:fe21:6563: Connection timed out
Trying 204.152.190.13...
Connected to ftp.netbsd.org.
220 ftp.NetBSD.org FTP server (NetBSD-ftpd 20040809) ready.
Name (ftp.netbsd.org:sobrado): ftp
331 Guest login ok, type your name as password.
Password:

Is it a known routing problem?

I really don't know how reliable is the output of traceroute these days,
perhaps we get a more accurate output if we avoid using UDP datagrams...

$ traceroute6 -I ftp.netbsd.org
traceroute6 to ftp.netbsd.org (2001:4f8:4:7:2e0:81ff:fe21:6563) from 2001:5c0:8fff:fffe::21c7, 64 hops max, 16 byte packets
1 2001:5c0:8fff:fffe::21c6 251.915 ms 266.66 ms 202.133 ms
2 2001:5c0:0:5::114 308.414 ms 202.644 ms 201.742 ms
3 if-5-0-1.6bb1.mtt-montreal.ipv6.teleglobe.net 288.71 ms 318.177 ms 200.775 ms
4 if-1-0.mcore3.mtt-montreal.ipv6.teleglobe.net 201.471 ms 203.874 ms 204.279 ms
5 if-1-0.core2.nto-newyork.ipv6.teleglobe.net 306.701 ms * 258.418 ms
6 if-13-0.mcore3.njy-newark.ipv6.teleglobe.net 306.676 ms 303.426 ms *
7 * * *
8 gin-aeq-6bb1.ipv6.teleglobe.net 215.917 ms 402.234 ms 216.106 ms
9 * * *
10 * * *
11 * * *
12 * * *
13 * *^C

On the other hand, other sites can be traced without problems:

$ traceroute6 -I ftp.kame.net
traceroute6 to ftp.kame.net (2001:200:0:8002:203:47ff:fea5:3085) from 2001:5c0:8fff:fffe::21c7, 64 hops max, 16 byte packets
1 2001:5c0:8fff:fffe::21c6 443.448 ms 562.576 ms 546.389 ms
2 2001:5c0:0:5::114 254.656 ms 248.993 ms *
3 if-5-0-1.6bb1.mtt-montreal.ipv6.teleglobe.net 202.762 ms 545.65 ms 506.171 ms
4 if-1-0.mcore3.mtt-montreal.ipv6.teleglobe.net 613.861 ms 489.851 ms 736.346 ms
5 if-1-0.core2.nto-newyork.ipv6.teleglobe.net 1061.18 ms 1096.02 ms *
6 * * *
7 gin-nto-6bb1.ipv6.teleglobe.net 789.558 ms 479.17 ms 447.931 ms
8 2001:458:26:2::80 713.223 ms 515.226 ms 392.729 ms
9 2001:458:26:2::280 527.775 ms 251.482 ms 261.041 ms
10 v6-laIX01.kddnet.ad.jp 602.746 ms 400.889 ms 633.246 ms
11 v6-oteCORE01.kddnet.ad.jp 805.905 ms 878.91 ms 849.678 ms
12 2001:200:0:1800::7660:1 995.279 ms 554.292 ms 487.71 ms
13 3ffe:8140:101:6::4 877.05 ms 741.508 ms 715.79 ms
14 * 2001:200:133::9c4:0 621.704 ms 458.269 ms
15 2001:200:0:1c04:230:13ff:feae:5b 610.037 ms 755.182 ms *
16 2001:200:0:4800::7800:1 691.959 ms * 491.819 ms
17 orange.kame.net 414.747 ms 529.897 ms 683.018 ms

I am using the TSP Client-based service provided by Hexago.

Thanks in advance for any help!

Igor.

Timothy Larson · *nix forums beginner Joined: 25 Apr 2005 Posts: 33

Igor Sobrado wrote:

igor@nospam.invalid · *nix forums addict Joined: 17 Aug 2005 Posts: 81

Timothy Larson <thelarsons3@cox.net> wrote:

Google