[Babel-users] AHCP and IPv4 support

[Mitar]

Hi!

On Tue, Jun 8, 2010 at 9:17 PM, Henning Rogge <hrogge at googlemail.com> wrote:
> Because there are not enough of them to generate them from MAC. With only 2^16
> IPs it's a lot easier to get a collision.

Why? You need only two? All nodes which already have a real IP could
use the same link-local IP to listen for requests (it is not important
which node respond) and all connecting nodes would have another
link-local IP. OK, because multiple new nodes could try to connect to
the mesh at the same time it would be useful to spread that IP over
some broader range, like 2^16. But chance that a good hash function
based on MAC which would produce this temporary IP address would have
a collision in this short time-span (while two nodes are trying to get
their IP) is slim, isn't it? Once it gets a real IP it would just
start using the same link-local IP address as others.


Mitar