RE: [v6ops] How do you solve 3GPP issue if neither operator nor handset supports PD?

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Tue, 24 November 2020 14:24 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "Eric Vyncke (evyncke)" <evyncke=40cisco.com@dmarc.ietf.org>, "otroan@employees.org" <otroan@employees.org>, Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>
CC: 6man WG <ipv6@ietf.org>
Subject: RE: [v6ops] How do you solve 3GPP issue if neither operator nor handset supports PD?
Thread-Topic: [v6ops] How do you solve 3GPP issue if neither operator nor handset supports PD?
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Hello Eric:

Maybe as a keep alive; RFFC 6550 expects that there's such a thing and suggests to use ND. The peers use NS/NA exchange their Link Local addresses and no or empty SLLAO. 
Then they use the link locals to do their protocol exchange, e.g., IGP.

https://tools.ietf.org/html/rfc8505#section-5.6 formalizes the use of link local addresses with a scope of uniqueness which is the pair of nodes, regardless of whether the radio reaches some other nodes at this particular moment. I've seen people oppose RFC 8505 with P2P designs and that's not an indication that they read the spec.

Because the scope of the 2 Link local addresses is the pair of nodes, DAD is instantaneous for link locals, and link local operations can start immediately.

Also note that the classical NS/NA, just like the classical ARP, are not ideally suited. The desire being to form P2P L3 links and find out who's on the other side (which addresses). You'd like to ask a question like what's your LLA, what's your complete set of addresses on this link, an IPv6 adaptation of inverse ARP. This is what we tried to do with https://tools.ietf.org/html/draft-thubert-3122bis, from which RFC 8505 takes its most ancient roots. 

Keep safe;

Pascal

> -----Original Message-----
> From: ipv6 <ipv6-bounces@ietf.org> On Behalf Of Eric Vyncke (evyncke)
> Sent: mardi 24 novembre 2020 15:00
> To: otroan@employees.org; Philip Homburg <pch-ipv6-ietf-6@u-
> 1.phicoh.com>
> Cc: 6man WG <ipv6@ietf.org>
> Subject: Re: [v6ops] How do you solve 3GPP issue if neither operator nor
> handset supports PD?
> 
> 
> 
> -----Original Message-----
> From: ipv6 <ipv6-bounces@ietf.org> on behalf of "otroan@employees.org"
> <otroan@employees.org>
> Date: Tuesday, 24 November 2020 at 14:39
> 
> 
> >    To be clear. If a link-type has no L2 address / is point to point, then no
> implementation I've touched does ND address resolution.
> 
> Indeed, what would be the purpose of NA if there is no L2 address to advertise ?
> 
> -éric
> 
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