nanog at daork.net
Sun Oct 12 22:05:01 UTC 2008
On 13/10/2008, at 9:53 AM, Stephen Sprunk wrote:
> Mikael Abrahamsson wrote:
>> This brings up an interesting question, should we stop announcing
>> our 6to4 relays outside of Europe? Is there consensus in the
>> business how this should be done? I have heard opinions both ways.
> I can understand why some folks would say stop, but unfortunately
> Europe has the closest public 6to4 relays to the US, and our own
> providers don't seem to want to put any up. That means 6to4 will
> break for a great many folks who _are_ trying to use IPv6 (like
> developers trying to get ahead of the curve and make sure their apps
> don't break when the transition finally happens) but whose providers
> haven't clued in yet.
I'm sure I sound like a broken record to some, but whenever I see
these comments I feel the need to step up and correct them, until I
don't see them anymore.
By far the biggest end users of IPv6 are non-experimenters. Real end
users, many of whom do not know what an IP address is.
6to4 is enabled by default in Vista - any Vista machine with a non-
RFC1918 address will use 6to4. It is also available in some linksys
routers, and is enabled by default in Apple Airport Extreme.
> (My traceroutes to 188.8.131.52 have a next-to-last hop in Amsterdam,
> and I'm on one of the largest ISPs in the US, which apparently
> hasn't figured out 6to4, much less native IPv6.)
There are public 6to4 relays in the US, I guess your provider just has
a shorter ASPATH to somewhere in Europe. Unfortunately BGP had no idea
of geography :-)
Re. whether to advertise outside your continent, it really depends
whether you're trying to achieve 'good enough' connectivity for 100%
of people, or really good connectivity for 95% of people.
Perhaps a good way to do it is advertise outside Europe, but have the
providers that get your advertisement out there prepend their AS a few
times as it leaves. That way, US providers will still prefer US 6to4
relays (ie lower latency) but any who don't get a 184.108.40.206/24 route
from the US will us your relay in Europe. Kinda gets you best of both
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