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>> 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. The same holds true for 3GPP2 networks as well. Original Message: ----------------- From: Karim El-Malki
(HF/EAB) karim.el-malki@ericsson.com Date: To: Alain.Durand@Sun.COM, Subject: comments on draft-durand-v6ops-assisted-tunneling-requirements-00.txt Hi I have some comments on the draft. Section 2 says: - The customer
configuration may be diverse, and not necessarily predictable by the ISP. The following cases must be
supported:
- a single node,
- a leaf network,
- using a globally routable IPv4 address,
- behind a NAT, However it also says (later in section 2): 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. /Karim |