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Re: comments on draft-durand-v6ops-assisted-tunneling-requirements-00 .txt

I guess I'll have to take exception to the text of section 7.3 in the
current document version. The sentence:

 "However, as ISATAP cannot work accross NAT, it is of much
  less interest in the framework of this document."

seems more a statement of opinion rather than a statement of fact
born out through analysis.

My suggestion is to simply remove this sentence, since doing so
would remove any opinions/presumptions w/o altering the overall
technical content of the section.

Fred
ftemplin@iprg.nokia.com

Pekka Savola wrote:

On Wed, 14 Apr 2004, Karim El-Malki (HF/EAB) wrote:


  Althought the main focus of this document is the ISP scenario,
  assisted tunneling is applicable in all the other scenarios:
  unmanaged, enterprise and 3GPP.
  ...
  In 3GPP networks, assisted tunneling can be used in the context of
  dual stack UE connecting to IPv6 nodes through a 3GPP network that
  only supports IPv4 PDP contexts [3GPP, 3.1].

There seems to be a contradiction when considering 3GPP networks,
since the customer does not have a NAT in the customer equipment
(i.e. mobile terminal). Therefore the tunneling can be terminated
within the mobile operator's network and never goes through a NAT.
That's a good thing since we wouldn't have to pass even more traffic
(v6 tunnelled traffic) through NATs in this scenario. For the same
reason the following consideration on ISATAP does not apply to 3GPP
networks (also described in the draft reference [3GPP]):

7.3 ISATAP

  Similar considerations as Teredo, section 7.2, applies to Isatap.
  However, as Isatap can not work accross NAT, it is of much less
  interest in the framework of this document.

I think that to make this draft applicable to 3GPP networks some
substantial changes would be needed such as the removal of the NAT
assumption.



I do not see the contradiction.

The document just basically says, "we want to support all the scenarios, whether it goes through a NAT or not".

In the case of 3GPP, it doesn't go through NAT, but the requirements are equally applicable.

On the other hand, as I read it, section 7.3 basically says "ISATAP could be supported, but as it is not applicable through a NAT, it would only be usable in the scenarios where there is no NAT, so it might not be worth the effort plug ISATAP support in the tunnel server clients/servers."