[support] Why does HA do ndisc_do_dad action?

[tony chen]

Thank you ,
so the HA perform the DAD action is in order to check the HoA is not
already used on the link again.

I see.

2009/7/31 Romain KUNTZ <kuntz at lsiit.u-strasbg.fr>

> Hi,
>
>
> On 2009/07/30, at 20:48, Arnaud Ebalard wrote:
>
>> tony chen <aoc90058 at gmail.com> writes:
>>
>>  Hi everybody, I have a problem about DAD at HA.
>>> When I go to the foreign network from home network,
>>> I can find the DAD success message from the HA debug message.
>>>
>>> I feel confusing, why does the ha do the DAD action,
>>> for what ??
>>>
>>
>> I would have to check the code but I think this is the default behavior
>> of the ND proxy code being activated for the MN that just registered
>> with its HA from a foreign network.
>>
>
> Yes, upon the first registration of the MN, the HA sends a multicast NS on
> the Home Link to check if the MN's HoA is not already used on the link. If
> it does not get any NA reply after 1 sec (IIRC), it replies with a BA to the
> MN. This is what the "DAD succeeded" message means on the HA.
>
> Cheers,
> romain
>
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