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Re: ocean: do not boil
On Fri, 27 Sep 2002 firstname.lastname@example.org wrote:
> >Now the dual-stack problem: with NAT-PT, dual-stack will always be forced
> >to use a IPv6-mapped address (translation path) that the DNS-ALG
> >synthesized for a v4 destination. dual-stack could very well use IPv4 to
> >talk to the destination, but is forced to use IPv6+NAT-PT because of
> >DNS-ALG's current behavior. this is assuming dual-stack is sending AAAA
> >first, and then A; but not true for other cases.
> site -> outside:
> - if the site uses private IPv4 addrss and IPv4 NAT, it doesn't really
> matter if we use NAT-PT or IPv4 NAT.
The ALG support on NAT vs NAT-PT would be the difference.
> within site
> - DNS-ALG needs to be clever when returning synthesized AAAA address
> for NAT-PT. for instance, DNS-ALG could do the following when asked
> for AAAA of foo.example.com:
> query AAAA for foo.example.com - it's not there
> query A for foo.example.com - it should be there (X)
> if X is within the site, return empty answer section with
> NOERROR (indicate that foo.example.com does not have
> AAAA, and invite client to use IPv4)
How do you determine if X is within the site or outside?
> if X is outside the site, return synthesized AAAA record
> for NAT-PT translation.