Re: v4 side unmodifiable

[Rémi Denis-Courmont <rdenis@simphalempin.com>]

Le Friday 07 December 2007 06:12:55 Brian Dickson, vous avez écrit :
> If the provider adds AAAA records, it can trigger a bad user experience
> from unintended sources (e.g. toredo hosts).

I am fairly disturbed when even IETF IPv6 experts fail to recognize that this 
(a Teredo or 6to4 host trying to connect to a native dual-stack host) does 
not happen, and is hence not an issue. Why do you think Source Address 
selection was invented for?

As it happens, I am not aware of any vendor with 6to4 and/or Teredo 
on-by-default *without* proper Source Address Selection policy. As such, if 
you do put a "native" AAAA record in addition to an existing A record, only 
native IPv6 host will (try to) use IPv6 to connect to you.

Indeed, from my personal experience as a "I eat my dog food" guy, there are 
many more problems establishing native-native IPv6 connections, than when 
using automated transition mechanism. That is not to say that transition 
mechanisms are reliable (which they are not). But the fact is that there are 
still a awful lot of (native) IPv6 routing issues, and that's one thing 
Source Address Selection cannot and does not protect against.

-- 
Rémi Denis-Courmont