6to4 routes disappeared from most of North America?

Joe Abley jabley at isc.org
Wed Jul 27 01:03:08 UTC 2005



On 26 Jul 2005, at 20:44, Todd Vierling wrote:

> Maybe I missed it, but was there some concerted effort to remove or 
> block
> access to the 2002::/16 route on the v6 backbone in North America 
> recently?
> Connectivity to/from 6to4-only hosts seems sketchy at best.  Of the US 
> hosts
> I've tried, only ISC has responded at all to a 6to4 packet -- and 
> they're
> routing 2002::/16 through WIDE in Japan from what I can tell.

Right now we're using a 6to4 relay router in Verio's network for most 
traffic, although we do see other paths, so mileage may vary depending 
on which edge router the outbound traffic from ISC happens to exit 
through.

jabley at r2.sfo2> traceroute 2002::
traceroute6 to 2002:: (2002::) from 2001:4f8:4::2, 30 hops max, 12 byte 
packets
  1  r2.r3.sfo2.isc.org (2001:4f8:0:1::6:2)  0.891 ms 
r2-2.r3.sfo2.isc.org (2001:4f8:0:1::f:2)  0.736 ms r2.r3.sfo2.isc.org 
(2001:4f8:0:1::6:2)  0.675 ms
  2  r3-sfo2.r8.pao1.isc.org (2001:4f8:0:1::5:1)  1.701 ms  1.606 ms  
1.517 ms
  3  r8.r7.pao1.isc.org (2001:4f8:0:1::4:1)  1.505 ms 
r8-2.r7.pao1.isc.org (2001:4f8:0:1::3:1)  1.855 ms  1.472 ms
  4  p4-2-0-2.r00.plalca01.us.bb.verio.net (2001:418:0:5000::1d)  1.737 
ms  9.352 ms  1.55 ms
  5  p16-0-1-0.r20.plalca01.us.bb.verio.net (2001:418:0:2000::189)  
1.486 ms  1.588 ms  1.477 ms
  6  ge-2-0.r02.plalca01.us.bb.verio.net (2001:418:0:2000::1fe)  1.574 
ms  1.547 ms  1.537 ms
^C
jabley at r2.sfo2>

We had a local 6to4 relay running for some time in the lab, but it's 
not up right now. If there's general interest in a 6to4 relay in AS 
3557 for public use, we could definitely look at making one available.


Joe




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