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Re: Geographic map of IPv6 availability
On 12/10/2007, at 9:43 AM, Tony Hain wrote:
Nathan Ward wrote:On 6/10/2007, at 3:18 AM, Stephen Wilcox wrote:<stuff> Given the above, I think there is no myth.. !
I have both 6to4 and Teredo relays available to all my servers, let me explain;
(sorry to those who've read me talking about this already)
The problem is "enterprise" networks that have /all/ of the following conditions as true:
- Use non-RFC1918 addressing for hosts.
- Do firewalling (and block IP proto 41) or NAT.
- Use Windows Vista and have not disabled 6to4.
Some common examples:
- Large companies.
- Educational institutions (especially ones where people bring their own laptops - Vista configs can't be dictated).
1) These networks deploy 6to4 relays.
2) These networks deploy IPv6 natively.
3) These networks deploy 'fake' 6to4 relays which return unreachable messages when someone tries to use them, so packets don't time out.
4) Everyone else figures out a standard to to test the availability of 6to4 services (not unlike Teredo's qualification procedure).
I think that (4) is probably the path of least resistance, so I intend to do some work in that area.
The entire finger-pointing fiasco between the infrastructure providers and
As both a an infrastructure and content provider (I have many different hats), I point at Microsoft Vista - I appreciate the initiative, but problems like this have (in my view) had a net negative effect.
Nice rant though :-)
What is your suggestion RE DNS there? Are you proposing using views or something, to direct 6to4 'clients' to content over 6to4? If so, I don't think that would work terribly well - it wouldn't solve the problem in situations I describe above, but it's likely that it would improve performance for networks who choose to run 6to4, and have their own recursive resolvers who live in their v6 island.
Does anyone have info on how bind (and other recursive resolvers) select whether to use v6 or v4 if an NS points at a resource with both A and AAAA records? Most OSes prefer the AAAA record, does bind behave the same?
-- Nathan Ward