Re: I-D Action: draft-mishra-6man-variable-slaac-01.txt

[Mikael Abrahamsson <[e-mail]>]

On Mon, 9 Nov 2020, Mikael Abrahamsson wrote:

> If you already know what /56 the customer has (because you assign it the 
> same way as the default bearer /64 is assigned today), you don't need a 
> full-on stateful dhcpv6 server in the PDN gateway. You can do it 
> statelessly and just respond with the same /56 regardless. You don't 
> need a full DHCPv6-PD server, you just need a bare-bones DHCPv6 
> responder that takes information from the local pool database that it 
> already uses to keep track of what prefix goes to what bearer.

https://www.etsi.org/deliver/etsi_ts/123400_123499/123401/11.03.00_60/ts_123401v110300p.pdf 
talks about /56 instead of /64, and then it uses PD-exclude for the 
RA-announced "classic" /64 on the bearer.

This seems to me like it was designed *exactly* to avoid more state in the 
PDN gateway. You just assign a /56 to each bearer, send the /64 RA as you 
always do, then if someone happens to ask for DHCPv6-PD you respond with 
that /56. There is no additional "DHCP-servers" etc, you just need a bare 
minimum DHCPv6-PD "announcer/responder".

I can't believe this standard was done in 2011 and now 9 years later we're 
still not any further into deployment. Why?

-- 
Mikael Abrahamsson    email: [e-mail]