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Groups > comp.os.linux.networking > #446

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:

[…]

 > Obviously, the STB is not able to talk directly to ipv6.google.com
 > since it does not support IPv6.

 > I see several work-arounds.  The server could be dual stack, and
 > provide ALSO an IPv4 address, but 1) IPv4 address space is running
 > out and 2) the STB might be confused by the IPv6 addresses in the DNS
 > reply, even if it should just ignore them.

	Let's check it out:

$ dig ipv6.google.com A 

; <<>> DiG 9.7.2-P3 <<>> a ipv6.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51576
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;ipv6.google.com.		IN	A

;; ANSWER SECTION:
ipv6.google.com.	0	IN	CNAME	ipv6.l.google.com.

;; AUTHORITY SECTION:
l.google.com.		60	IN	SOA	ns2.google.com. dns-admin.google.com. 1457624 900 900 1800 60

;; Query time: 252 msec
;; SERVER: ::1#53(::1)
;; WHEN: Thu Jul 28 21:01:10 2011
;; MSG SIZE  rcvd: 104

$ 

	As could be seen from the above, no AAAA (IPv6 address) resource
	records were returned by the server.  So, there's nothing to
	confuse the device in question.

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

[…]

-- 
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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