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List: ipng
Subject: Re: [v6ops] How do you solve 3GPP issue if neither operator nor handset supports PD?
From: Alexandre Petrescu <alexandre.petrescu () gmail ! com>
Date: 2020-12-07 17:57:09
Message-ID: 957e108e-1899-6706-22ed-b40ac5175b05 () gmail ! com
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Le 24/11/2020 à 23:28, David Allan I a écrit :
> FWIW for a 5G UE, the SMF assigns the interface ID used for LLA etc.
> as part of the PDU session setup. See TS24.501 clause 9.11.4.10.
I will add a reference to this document to the DANIR draft in the V6OPS WG.
I would like to ask whether typing 'what is my IP address' in the google
search bar of a 5G-connected smartphone displays an IPv6 address?
Alex
>
> Cheers D
>
> -----Original Message----- From: ipv6 <ipv6-bounces@ietf.org> On
> Behalf Of Templin (US), Fred L Sent: Tuesday, November 24, 2020 1:52
> PM To: Alexandre Petrescu <alexandre.petrescu@gmail.com>;
> ipv6@ietf.org Subject: Re: [v6ops] How do you solve 3GPP issue if
> neither operator nor handset supports PD?
>
> Alex, see below:
>
>> -----Original Message----- From: ipv6
>> [mailto:ipv6-bounces@ietf.org] On Behalf Of Alexandre Petrescu
>> Sent: Tuesday, November 24, 2020 1:33 PM To: ipv6@ietf.org Subject:
>> Re: [v6ops] How do you solve 3GPP issue if neither operator nor
>> handset supports PD?
>>
>>
>> Le 24/11/2020 à 17:44, Templin (US), Fred L a écrit :
>>> Getting what I said earlier onto this thread, I think we should
>>> be discussing the LLA-based PD scheme specified in:
>>>
>>> https://datatracker.ietf.org/doc/draft-templin-6man-lla-type/
>>>
>>> What is unique and compelling about this scheme is that it
>>> brings down two birds with one stone; in a single RS/RA exchange,
>>> the mobile node receives both 1) an IPv6 PD, and 2) an LLA that
>>> is guaranteed to be unique on the link without having to apply
>>> DAD.
>>
>> YEs for 1), but for 2) one would also consider the IPv6CP part of
>> ppp and the PDP protocols. These two protocols are also involved
>> in the negotiation of an IID, LLA or even a GUA some times, on that
>> link.
>
> I assume this exchange happens even before the first IPv6 ND message
> exchange over the link? If so, then if the PDP protocols convey an
> OMNI LLA even before any IPv6 ND message exchange then the "PD"
> operation will already be complete since the OMNI LLA already
> contains the delegated prefix. Would that be a useful
> simplification?
>
> Thanks - Fred
>
>> Delegating a prefix is typically associated by an operation of
>> insertion of an entry in a routing table. That entry should have
>> a next hop address. That address could be an LL address or a GUA.
>> These are negotiated by these IPv6CP or PDP protocols.
>>
>> If it is too complicated to make IPv6-PD option to use the
>> addresses created by IPv6CP or by PDP as nexthop, then one could
>> delegate a prefix without pointing to a nexthop, but using that old
>> p2p trick.
>>
>> Also, the suggestion of this draft of using another LL address
>> comes down to associating several LL addresses to an interface;
>> because the LL address made by PDP or IPv6CP is always there. If
>> such a 2nd LL address is associated to an interface, but is not
>> used in the Gateway as a nexthop field, then one wonders why
>> bothering forming it at all. An interface must always have one LL
>> address, and that is given by IPv6CP or PDP, I think.
>>
>> I am not saying it is not a good idea, though.
>>
>> Alex
>>
>>>
>>> The idea for this LLA-based PD scheme is as follows:
>>>
>>> 1) The requesting router creates a temporary LLA using
>>> RFC4941(bis) and sets a prefix length indication inside the LLA
>>> itself. The RR then uses the LLA as the IPv6 source address of an
>>> RS message to send to the delegating router.
>>>
>>> 2) When the delegating router receives the RS, it sees that the
>>> IPv6 source is an RFC4941(bis) address with a non-zero prefix
>>> length indication. The DR then coordinates with the DHCPv6 server
>>> to request a PD of the length indicated by the RR.
>>>
>>> 3) When the DR receives the PD from the DHCPv6 server, it creates
>>> an OMNI LLA by embedding the delegated prefix in the IID of
>>> fe80::/64, e.g., as fe80::2001:db8:1:2. The DR then sets a prefix
>>> length indication in the OMNI LLA, and sets the LLA as the
>>> destination address of an RA message to send back to the RR.
>>>
>>> 4) When the RR receives the RA message, it sees that the
>>> destination is an OMNI LLA with a non-zero prefix length. The RR
>>> then uses the embedded prefix within the OMNI LLA as its
>>> delegated prefix, and regards the Router Lifetime as the time at
>>> which the delegated prefix needs to be renewed.
>>>
>>> Questions?
>>>
>>> Fred
>>>
>>> --------------------------------------------------------------------
>>>
>>>
IETF IPv6 working group mailing list ipv6@ietf.org Administrative
>>> Requests: https://www.ietf.org/mailman/listinfo/ipv6
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>>>
>>
>>
>>>
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