Re: [v6ops] I-D Action: draft-colitti-v6ops-host-addr-availability-01.txt
Alexandru Petrescu <alexandru.petrescu@gmail.com> Fri, 31 July 2015 13:10 UTC
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From: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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Date: Fri, 31 Jul 2015 15:09:52 +0200
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Subject: Re: [v6ops] I-D Action: draft-colitti-v6ops-host-addr-availability-01.txt
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Le 30/07/2015 19:16, Tore Anderson a écrit : > * Templin, Fred L > >> You can't give a device a /64 using SLAAC; SLAAC only allows for >> autoconfiguration of singleton addresses taken from an on-link /64 >> prefix. > > Hi Fred, > > Actually, SLAAC works equally well with off-link prefixes. There is > no inherent requirement in SLAAC that prefixes from which the > addresses are auto-configured must be on-link; the L and A bits in an > RA's PIO are completely orthogonal. I can agree. >> If you want to give a device a /64, the only choices I am aware of >> are administrative configuration or DHCPv6 PD. > > True, although 3GPP networks is an exception. There a /64 prefix > advertised to the UE via standard RA/PIO with SLAAC can be treated > as if it was a delegated prefix. RFC7278 depends on this. IMHO it is wrong to treat it as a delegated prefix. RFC7278 states clearly that the right way to get a delegated prefix is DHCPv6-PD. The treatment 'as if' is what makes operators think that one /64 in RA is enough space for enough devices behind the UE. A /64 on a cellular link can only accommodate one device. Something may make think that the /64 is a delegated prefix that _could_ accommodate more than one device: - the cellular link is a ptp link. As such the first-hop router in the cellular network has a specific routing table entry containing the IP address of the UE as next-hop (instead of a '*' if it were a shared link) for that /64. This makes that any address in that /64 is reachable through UE's IP address. However, cellular links continue to advance away from being ptp links and more be 'shared' links. Recently 4G ptp links have got 48bit MAC addresses. In the future there will be true Neighbor Discovery on these links, with '*' routes instead of next-hop routes. At that point, the assumption that a /64 can accommodate 2^64 devices will no longer hold, because the first-hop router will issue NSs for the dst address, instead of issuing RSs for the IP address of the UE. Alex > Tore > > _______________________________________________ v6ops mailing list > v6ops@ietf.org https://www.ietf.org/mailman/listinfo/v6ops >
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Brian E Carpenter
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Philip Homburg
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Mark Smith
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Philip Homburg
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Gert Doering
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Philip Homburg
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Ted Lemon
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Ted Lemon
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Andrew 👽 Yourtchenko
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Gert Doering
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Gert Doering
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Philip Homburg
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Gert Doering
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Gert Doering
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Philip Homburg
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Gert Doering
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Philip Homburg
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Andrew 👽 Yourtchenko
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Ted Lemon
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Templin, Fred L
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Gert Doering
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Templin, Fred L
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Ted Lemon
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Andrew 👽 Yourtchenko
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Templin, Fred L
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Ted Lemon
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Philip Homburg
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Ted Lemon
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Brian E Carpenter
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Ted Lemon
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Mark Smith
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Mark Smith
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Mark Smith
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Ted Lemon
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Tore Anderson
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Brian E Carpenter
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Ted Lemon
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Ted Lemon
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Philip Homburg
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Templin, Fred L
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Philip Homburg
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Templin, Fred L
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Tore Anderson
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Alexandru Petrescu
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Alexandru Petrescu
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Templin, Fred L
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Templin, Fred L
- Re: [v6ops] I-D Action: draft-colitti-v6ops-host-… Alexandru Petrescu