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Re: implications of 6to4 for v6coex
On Sep 16, 2008, at 18:39, Joe Abley wrote:
Perhaps you're asking the wrong question. Perhaps there's no reason
for any operator not to deploy a 6to4 relay for use of their
customers; perhaps the problem instead is that there is no clear
reason in the eyes of those operators to bother.
Does it make the helpdesk phone ring less? Will it cause an average
ISP to win more customers this month? I suspect the pragmatic answer
to both is no.
Sigh. Again, here are the incentives providers have today for
deploying 6to4 and Teredo relays:
+ To prevent P2P traffic between their customers using 6to4 at
2002::/16 and Teredo at 2001::/32 from having to be forwarded out of
their networks for disinterested 3rd parties to relay on their behalf.
Even for *IPv4-only* service providers, this either A) costs money for
traffic across their borders that would otherwise not need to be
carried (when the 3rd party relays are working), or B) prevents their
IPv4 customers electing to use different IPv6-transition mechanisms on
their own from communicating with one another (when the 3rd party
relays are refusing to serve) and drives customers away to other
providers where the relay service is reliable.
+ To wrest the control over the quality of service for their native-
IPv6 customers communicating with 2002::/16 and 2001::/32 destinations
on the public Internet away from the disinterested (and potentially
hostile) 3rd parties who operate the relays advertised to them.
Despite these incentives, service providers are balking at deploying
relays, and not merely for financial and practical reasons. Some have
privately told me their technical objections to the standards
themselves, which I have tried to relate here. (Sadly, the V6OPS
minutes from the Philadelphia and Dublin meetings don't seem to be
posted where I can find them, otherwise I would link to where I
remember Alain Durand's remarks in the V6OPS session about how private
6to4 and Teredo relays cannot be deployed in a practical fashion.)
No, I don't imagine that 6to4 and Teredo traffic *currently* costs
many providers enough money, or lost business, or help desk calls to
justify the expense of deploying the relays (though, with the recent
release of uTorrent 1.8, I suspect that may change). However, some
providers certainly *do* have technical objections.
--
james woodyatt <jhw@apple.com>
member of technical staff, communications engineering