[manet] Re: BABEL question

Even a /64 network is large enough that you should not worry about
collisions that much... or you just take one of the MACs of your local
interfaces for the host part.

Henning Rogge

On Thu, Jul 24, 2025 at 6:25 PM Juliusz Chroboczek <[email protected]> wrote:
>
> > The point is that RFC4193, Section 3.1 defines a format for ULAs that
> > includes a 40-bit "Global ID" followed by a 16-bit "Subnet ID" field in
> > the /64 prefix.
>
> Sure.
>
> > These values are to be assigned by infrastructure reference points, and
> > not randomly assigned by some isolated MANET router seeking to configure
> > a unique /128.  If MANET routers did that, then there would be
> > opportunity for conflict with a properly-administered ULA prefix if the
> > MANET ever came in contact with the Internet.
>
> I don't see how that follows.  If you draw a random address in fc00::/7,
> the probability of it conflicting with another node's address is
> infinitesimal, no matter how the other node's address was assigned.
>
> > while there would be a well-known IPv6 prefix value to differentiate
> > these topology independent "MANET Local Addresses" from
> > topology-dependent ULAs.
>
> Sure, if the prefix assigned to MANETs is short enough so that collisions
> are vanishingly unlikely.
>
> -- Juliusz

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