Re: Q: is RFC3531 still applicable?

[Adam Thompson <athompson () merlin mb ca>]

Understood, yes, but I should have been more clear: I'm talking about statically allocating my own internal /64s out of 
the /56 I've reserved for my org's own use.  Is there any point in using a more complex scheme than just "next!" ?
-Adam

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________________________________
From: Nicolas VUILLERMET <nicolas () vuillermet bzh>
Sent: Wednesday, May 15, 2024 7:31:31 AM
To: Mel Beckman <mel () beckman org>; Adam Thompson <athompson () merlin mb ca>
Cc: nanog <nanog () nanog org>
Subject: Re: Q: is RFC3531 still applicable?


Hello,

The minimum addressable on a LAN is a /64. So you have to provide the customer with a larger subnet.

Public operators in France generally deliver a /60.

The RFC gives /56, however, as customers are mobile and there is a risk of disaggregating into PAs (or rather allowing 
the customer to keep his IPs, such as DID portability), we, as operators, supply /48s directly.

Talking about the number of IPs that can be assigned in IPv6 shows a lack of understanding of IPv6. It's time to get 
trained!

My 2 cents,

Nicolas VUILLERMET
Network Engineer... and IPv6 ready.

On 14/05/2024 22:12, Mel Beckman wrote:
I never could understand the motivation behind RFC3531. Just assign /64s. A single /64 subnet has 
18,446,744,073,709,551,616  host addresses.  It is enough. Period.


 -mel

On May 14, 2024, at 12:54 PM, Adam Thompson <athompson () merlin mb ca><mailto:athompson () merlin mb ca> wrote:



Not an IPv6 newbie by any stretch, but we still aren’t doing it “at scale” and some of you are, so…



For a very small & dense (on 128-bit scales, anyway) network, is RFC3531 still the last word in IPv6 allocation 
strategies?



Right now, we’re just approaching it as “pick the next /64 in the range”, as it all gets aggregated at the BGP border 
anyway, and internally if I really try hard, I might get to 200 subnets someday.



Is there any justification for the labour in doing something more complex like center-allocation in my situation?  
Worrying about allocation strategies seems appropriate to me if you have 100,000 subnets, not 100.



Opinions wanted, please.

-Adam



Adam Thompson

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