Re: Q: is RFC3531 still applicable?

[William Herrin <bill () herrin us>]

On Wed, May 15, 2024 at 10:20 AM Randy Bush <randy () psg com> wrote:
> > The minimum addressable on a LAN is a /64.
>
> not really

The minimum (and maximum) subnet mask for a LAN in which -all- of
IPv6's technologies work right is /64. If you don't require stateless
autoconfiguration or automatic link-local addresses, you can pick any
subnet mask you want. In most cases it's desirable to have a size of
/64. In a few cases it's not.

Short version: use /64 as your IPv6 LAN subnet mask unless you clearly
understand the consequences of not doing so and intentionally want
them.

Regards,
Bill Herrin

-- 
William Herrin
bill () herrin us
https://bill.herrin.us/