Re: 64bit MAC addresses and SLAAC

["Pascal Thubert (pthubert)" <[e-mail]>]

> 
> Philip,
> 
>>> - the router still needs the resolution. There's stuff in
>>> draft-ietf-6man-grand and/or RFC 8505 for that.  - handling mobility
>>> vs. anycast. There's stuff in draft-ietf-rift-rift-12#section-4.3.3.3
>>> for that.  - all NBMAs are not hub and spoke so there's a routing
>>> game to trigger. There's stuff in draft-ietf-roll-unaware-leaves
>>> for that.  - still need to feed the mapping server for the overlay.
>>> There's stuff in draft-thubert-6man-unicast-lookup for that.  -
>>> zerotrust / SAVI is also missing and SEND did not cut it. There's
>>> stuff in draft-ietf-6lo-ap-nd for that.
>>> 
>>> For more detaiuls, there's draft-thubert-6man-ipv6-over-wireless,
>>> just let you go over it and comment if you really care.
>> 
>> Link address resolution can be solved to colocating a DHPCv6 relay with the
>> router. The relay can maintain IPv6 address to link layer address mappings
>> and inject those into the router's neighbor cache.
>> 
>> It seems to me that letting a host generate an address using SLAAC and then
>> forcing the host to register the address somewhere is just all of the work that
>> DHCPv6 does with none of the benefits.
> 
> Indeed.

Indeed not, 

though it could be done that way as well... basically the dhcp server provisioning the ND cache of the routers in the back end as opposed to any of the routers telling the server - which is how we did it.

Bottom line is that it’s a game of one host multiple routers and one server. If DHCP is your hammer feel free to use it. Intuitively it’s simpler to me For the host to tell the router and then the router does what’s needed, e.g. ask dhcp if present, inject in evpn if present etc.. going through dhcp to do that job imposes dhcp everywhere,  or my inclination. 

Note that dhcp does not save DAD in the first place so the loop is complete.

:)

Pascal

> 
>> Of course, if DHCPv6 would be allowed to have a default router option, then the
>> use of multicast could be reduced even further.
> 
> If there is interest I suppose I could ask for adoption of:
> https://datatracker.ietf.org/doc/draft-troan-6man-universal-ra-option/
> 
> Cheers,
> Ole