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Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-05.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 28 June 2017 00:44 UTC

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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Wed, 28 Jun 2017 12:44:13 +1200
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Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-05.txt
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On 28/06/2017 07:53, Simon Hobson wrote:
> Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> 
>>>   o  A-flag = 1 (The UE/subscriber can configure itself using SLAAC)
>>>
>>>   o  L-flag = 0 (the prefix is not an on-link prefix, which means that
>>>      the UE/subscriber will NEVER assume destination addresses that
>>>      match the prefix are on-link and will ALWAYS send packets to those
>>>      addresses to its default gateway.)
>>
>> Hmm. Please check this assertion for a host that implements RFC8028
>> if the LAN is multihomed. At the very least, such a host has more
>> than one "default" gateway - it has one per prefix.
> 
> In a multi-homed host, all this is done per-link. An address may well be on-link for one link, and off-link for another.

Yes. But the RFC8028 case is where the *LAN* is multihomed, so the host has
a choice of first-hop routers on the same link. It does not have a unique
default router.

   Brian

> So a host may well have the option of sending a packet to another host either directly via one link, or via a default router on another link. I don't think that invalidates any of the previous discussions - provided you consider each link in it's own right.
> 
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