[ipv6hackers] DAD and Link-Local

Owen DeLong owend at he.net
Fri Jul 13 20:35:04 CEST 2012

DAD can be disabled if you are sure that there is no chance of collision.

With randomly chosen IID, you're not sure, but it's highly unlikely.

With MAC-based IID, you can check once and be sure until the hardware changes.

On a point-to-point link disabling DAD is probably harmless even if there is a collision.


On Jul 13, 2012, at 6:49 AM, <daniel.bartram at bt.com> <daniel.bartram at bt.com> wrote:

> All,
> After some advice...
> Aware that DAD is performed on link-local as well as global addresses to ensure uniqueness, but if the link-local is a randomly generated value, or even the IID for that matter, on a P2P link using only link-local addresses, what are the chances of those addresses ever matching? In which case, can DAD be disabled?
> Dan.
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