Re: [opensuse] Ipv6 and dns

Carl Hartung wrote:

On Tue, 29 May 2012 19:33:59 +0200
Per Jessen <per@xxxxxxxxxxxx> wrote:

[snip]

We're not talking about responses going over IPv6, but about
responses with AAAA DNS records (which happen to be IPv6 addresses).
The actual communication might happen over IPv4, -5 or -6 or even
carrier pigeon (RFC1149). :-)


I get this part, Per. I really do - at least I /thought/ I did. This
explains why, when I run a query via cli from my IPv4 network, I get
back a listing containing both addresses (if the IPv6 address exists.)

Exactly.

But that's a diagnostic procedure, right?

Nope.

It isn't an exact replacement for the 'live' transaction that occurs
between, say, a browser on an IPv4 network and a DNS server configured
for, and residing on, an IPv6 network, right? IOW, in everyday
operation, if a request arrives at an IPv6 enabled server on IPv4 port
53, the fact that it arrives at the IPv4 address results in the IPv4
address, alone, being returned - the rational being it is presumed
that the client is unable to use the IPv6 address.

Am I way out past left field here today? :-)

Yeah ...
how a DNS query arrives will at most determine how the response will be
sent back. Whether a DNS query arrives via IPv4 or IPv6 does not in
any way determine what the response contains.


--
Per Jessen, Zürich (19.6°C)

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