Re: 2003:: prefix?

On Tue, 2006-04-04 at 00:14 -1000, Antonio Querubin wrote:
> Anybody know whether 2003::/16 is a valid prefix?  I'm seeing traceroutes 
> to www.iptel.org terminate in an unusual address when done from a 6to4 
> host:
> 
> traceroute6 to fox.iptel.org (2001:638:806:2001:202:b3ff:fe38:c1cc) from 
> 2002:4041:4e16::1, 64 hops max, 12 byte packets
>   1  2002:c058:6301::  10.238 ms  14.324 ms  10.640 ms
>   2  akepa-e0-0-7.lava.net  9.986 ms  10.933 ms  9.766 ms

inet6num:       2003:0000::/19
netname:        DE-TELEKOM-20050113
descr:          Deutsche Telekom AG
country:        DE

[..]
> 19  2003:100:1014:3100::1  325.120 ms !P  259.674 ms !P  259.193 ms !P

If you have an up-to-date whois client (eg the one from Marco d'Itri
which is the best client ;)

inet6num:       2003:0100:1014::/48
netname:        FOKUS-V6
descr:          IPv6 area of Fraunhofer FOKUS
descr:          temporary for IPv6 show case project
country:        DE

Also see http://www.sixxs.net/tools/grh/ of course.

www.iptel.org       	CNAME	fox.iptel.org
fox.iptel.org       	AAAA	2001:638:806:2001:202:B3FF:FE38:C1CC

The weird part is that the traceroute for me ends in:

 8  t2fokus.nr-ber1.6win.dfn.de (2001:638:f:800::806:2)  41.703 ms
41.825 ms  41.685 ms
 9  2001:638:806:3100::1 (2001:638:806:3100::1)  42.434 ms  59.916 ms
42.662 ms
10  2001:638:806:3100::1 (2001:638:806:3100::1)  42.276 ms !S  42.159
ms !S  42.153 ms !S

I guess the reason you see the 2003:: addresses is because the address
selection routines pick the 2003:: interface as they are the closest to
2002::/16.

6to4 is fun to debug ;)

Greets,
 Jeroen

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