RE: v6-v4 transition scenarios, take 2

["Templin, Fred L" <Fred.L.Templin@boeing.com>]

>The problem here of course is that Vista and some XP service pack 2  
>machines, should they be given one of these addresses will attempt to  
>bring up 6to4 as it is a non-RFC1918 address.
>There are two work-arounds for this that I can see, and I think it is  
>a good idea to do both.
>1) Enable IPv6 on the access. If windows has a native IPv6 address it  
>won't attempt to bring up 6to4.
>      - If you don't have an IPv6 transit service, still do this, but  
>simply return ICMPv6 destination unreachable messages.
>2) Direct all IPv4 protocol 41 (IPv6 over IPv4, 6to4) messages to a  
>6to4 relay, which returns ICMPv6 destination unreachable messages,  
>encapsulated in IPv4 as per 6to4. Windows will bring up 6to4, 
>but will  
>get error messages back so will fall back to IPv4 without waiting for  
>a time out.

Another possibility is to configure the NAT as an ISATAP
router and have the end systems use ISATAP.

Fred
fred.l.templin@boeing.com