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RE: NAT64 in RA, draft-ietf-6man-ra-pref64

"Mudric, Dusan (Dusan)" <dmudric@avaya.com> Mon, 08 July 2019 15:49 UTC

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From: "Mudric, Dusan (Dusan)" <dmudric@avaya.com>
To: "Manfredi (US), Albert E" <albert.e.manfredi@boeing.com>
CC: IPv6 Operations <v6ops@ietf.org>, 6man <6man@ietf.org>
Subject: RE: NAT64 in RA, draft-ietf-6man-ra-pref64
Thread-Topic: NAT64 in RA, draft-ietf-6man-ra-pref64
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Date: Mon, 08 Jul 2019 15:49:21 +0000
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> -----Original Message-----
> From: Manfredi (US), Albert E <albert.e.manfredi@boeing.com>
> 
> -----Original Message-----
> From: ipv6 <ipv6-bounces@ietf.org> On Behalf Of Mudric, Dusan (Dusan)
> 
> > - How can DNS64 tell IPv6 only client the IP of IPv4 only client, and vice
> versa?
> 
> IPv6 to IPv4 should be straightforward, because it's a one-to-one
> relationship. The other way around would normally not work, 
[Dusan] There is no solution for IPv4only client to reach IPv6only client? 

> but everyone
> has been accustomed to that with IPv4 NAPT already. 
[Dusan] How IPv4 only users (e.g. Avaya IPv4 only phones) can be accustomed not to be able to call IPv6only users (like Apple IPv6 only phones)?

>The client behind the
> NAPT initiates.
> 
> > Is DNS64 server returning IPv4ony client address to IPv6only client, using
> the A RR?
> 
> The DNS synthesizes the IPv6 address, which has the IPv4 address
> embedded in it.
> 
> > - How can IPv4only client get the address of IPv6only client (or, it is
> impossible for IPv4only client to get IPv6 address of IPv6only client)?
> 
> That's clearly more difficult, which is why the normal course of action is for
> the IPv6 client to initiate the session.
[Dusan] What if IPv4only client needs to initiate the session to IPv6only client? What is the solution for that use case?

> 
> > - Do these IPv4 and IPv6 client addresses need to be pre-configured on the
> translator and/or DNS64?
> 
> For IPv4 to IPv6, if you must allow the IPv4 client to initiate the session, you'd
> have to have preconfigure something.
[Dusan] Where and how is this configuration done?

> 
> Bert

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