nanog mailing list archives
Re: Yahoo and IPv6
From: Iljitsch van Beijnum <iljitsch () muada com>
Date: Sun, 15 May 2011 21:33:31 +0200
On 15 mei 2011, at 6:29, Matthew Kaufman wrote:
And that would be the fault of NAT64, which for all of the applications I mentioned (and more) made the seriously wrong assumption that every IPv4 address is looked up in a DNS server.
This brings to mind the story of the physicist (but it could easily have be an IETF protocol engineer) who was scrambling around under a lamp post at night. A passer by asked what he was doing: looking for my keys. Are you sure you lost them here? No, but under the light is the only place I have a chance at finding them.
It's not that the people involved with NAT64 (full disclosure, I'm one of them) thought that every IPv4 address would have a working DNS name, but rather that using the DNS made it possible to have a transition mechanism that lets unmodified IPv6 hosts talk to unmodified IPv4 hosts.
However, all is not lost: you can easily set up sessions through a NAT64 if the application (or the system, but that will take longer to materialize) learns the other 96 bits and stuffs them in front of the IPv4 bits. If the NAT64 uses the well known prefix the 96 bits are easy to learn, if it does not you'll need another mechanism, which are now being discussed. But an application could easily roll its own by looking up a known IPv6-only A record and then taking the 96 bits from the resulting AAAA record.
Current thread:
- Re: Yahoo and IPv6, (continued)
- Re: Yahoo and IPv6 Matthew Kaufman (May 15)
- RE: Yahoo and IPv6 George Bonser (May 15)
- Re: Yahoo and IPv6 Owen DeLong (May 16)
- Re: Yahoo and IPv6 Iljitsch van Beijnum (May 16)
- RE: Yahoo and IPv6 George Bonser (May 16)
- Re: Yahoo and IPv6 Owen DeLong (May 16)
- RE: Yahoo and IPv6 Dan Wing (May 16)
- Re: Yahoo and IPv6 Owen DeLong (May 16)
- Re: Yahoo and IPv6 Arturo Servin (May 16)
- Re: Yahoo and IPv6 Owen DeLong (May 15)
- Re: Yahoo and IPv6 Iljitsch van Beijnum (May 15)
- Re: Yahoo and IPv6 Iljitsch van Beijnum (May 10)
- Banks and IPv6 (was Re: Yahoo and IPv6) Jared Mauch (May 10)
- Re: Yahoo and IPv6 Igor Gashinsky (May 10)
- Re: Yahoo and IPv6 Warren Kumari (May 10)
- Re: Yahoo and IPv6 Iljitsch van Beijnum (May 10)
- Re: Yahoo and IPv6 Scott Whyte (May 10)
- Re: Yahoo and IPv6 Jason Fesler (May 10)
- Re: Yahoo and IPv6 Mark Andrews (May 10)
- Re: Yahoo and IPv6 Karl Auer (May 10)
- Re: Yahoo and IPv6 Mark Andrews (May 10)