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Groups > comp.os.linux.networking > #451

Re: IPv4 host behind NAT talking to IPv6 host

Cross-posted to 2 groups.

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>>>>> Noob  <root@127.0.0.1> writes:
>>>>> Ivan Shmakov wrote:

[…]

 >> So, there's nothing to confuse the device in question.

 > Thus the IPv4-only device is unable to talk to the IPv6-only server,
 > right?

	Not directly, at the least.

 >> (Of course, it's unlikely that an IPv4-only device will ever request
 >> AAAA records from the DNS server.  Neither should it request ANY.)

 > I mistakenly believed gethostbyname would issue a request for "ANY"
 > record.

 > But in the scenario where the modem is trying to provide
 > "transparent" compatibility with IPv6-only nodes, does that mean that
 > some DNS-ALG is supposed to rewrite outgoing DNS requests?

	I know of NAT64, which is a proposed solution for the inverse
	problem.  I. e., NAT64 is designed to allow IPv6-only hosts to
	connect to IPv4-only ones.  Indeed, it requires some DNS
	rewriting.  So I guess it would also be necessary to allow
	IPv4-only hosts to connect to IPv6-only ones.

	I should note, however, that while NAT64 relies on a mapping of
	the whole IPv4 address space into a part of the IPv6 one, I
	cannot imagine a way to map it the other way around.

	For the simpler cases, I'd rely on dual stack application-level
	gateways (like HTTP proxies), which were already mentioned in
	this thread.

-- 
FSF associate member #7257

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Thread

IPv4 host behind NAT talking to IPv6 host Noob <root@127.0.0.1> - 2011-07-28 12:14 +0200
  Re: IPv4 host behind NAT talking to IPv6 host Ivan Shmakov <ivan@gray.siamics.net> - 2011-07-28 21:05 +0700
    Re: IPv4 host behind NAT talking to IPv6 host Noob <root@127.0.0.1> - 2011-07-28 17:44 +0200
      Re: IPv4 host behind NAT talking to IPv6 host Ivan Shmakov <ivan@gray.siamics.net> - 2011-07-28 23:16 +0700
      Re: IPv4 host behind NAT talking to IPv6 host Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-07-28 17:23 +0000
      Re: IPv4 host behind NAT talking to IPv6 host Barry Margolin <barmar@alum.mit.edu> - 2011-07-28 18:34 -0400
  Re: IPv4 host behind NAT talking to IPv6 host Richard Kettlewell <rjk@greenend.org.uk> - 2011-07-28 15:22 +0100
  Re: IPv4 host behind NAT talking to IPv6 host Barry Margolin <barmar@alum.mit.edu> - 2011-07-28 11:02 -0400
    Re: IPv4 host behind NAT talking to IPv6 host Noob <root@127.0.0.1> - 2011-07-28 17:58 +0200

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