6to4 strangeness

[David Malone]

On Tue, Feb 14, 2006 at 06:22:57PM +0100, Iljitsch van Beijnum wrote:
> This means that for them, or rather, their 6to4 gateway, my  
> 2001:1af8::/32 address is unreachable, but 3ffe:2500::/32 works. WTF?

Whois shows the IPv4 address 66.235.180.107 belongs to HopOne
Internet. They have a traceroute server which I used to traceroute
to 192.88.99.1. It looks like the route currently leads to
teleport-iabg.de. Is there anyone from there on this list who could
check their route back to 2001:1af8::/32?

In case anyone is interested, I've had a quick look at the relative
levels of activity of different /16s seen by some of our servers
over varying periods that I have logs for:

    /16    DNS Server          HTTP Server     Proxy Server
          (#itterive clients) (#HTTP clients) (#HTTP/FTP servers)
    2001     673                1382               10
    2002      36                1436                1
    3ffe      32                  48                0

This is discarding stuff in our own /48 and may be biased by address
selection because we are in 2001::/16. Seems to support roughly
what you might guess: 6to4 isn't so popular for servers. It does
seem that 6bone use is declining, but I have no concrete older
stats to compare this to.

> I've written another book! http://www.runningipv6.net/

I've only written one (with help ;-) http://www.oreilly.com/catalog/ipv6na/

	David.

traceroute: Warning: Multiple interfaces found; using 207.228.225.4 @ le0
traceroute to 192.88.99.1 (192.88.99.1), 30 hops max, 40 byte packets
 1  vlan10-d2.acc.dca1.hopone.net (207.228.225.3)  4.315 ms  2.342 ms  2.207 ms
 2  ge3-0.core1.dca1.hopone.net (207.228.224.132)  2.244 ms  2.301 ms  2.227 ms
 3  ge1-0.core2.dca1.hopone.net (207.228.224.133)  2.384 ms  2.327 ms  2.200 ms
 4  pos1-2.core1.iad1.hopone.net (207.228.224.190)  4.241 ms  4.451 ms  4.066 ms
 5  206.223.115.100 (206.223.115.100)  4.797 ms  4.894 ms  4.764 ms
 6  62.214.104.222 (62.214.104.222)  1170.496 ms * *
 7  POS9-1-0.bbr2.muc.completel.de (195.167.211.1)  1250.280 ms  1224.317 ms *
 8  * Vlan11.agr3-msfc1.muc.completel.de (195.167.209.21)  1272.751 ms *
 9  vst1-gw.teleport-iabg.de (195.226.164.84)  1304.886 ms * *