RFC 4068 - Multicast NA

Hi Raghav,

The multicast NA is just to announce to everyone about the MN’s attachment. You’re right it has nothing to with the HoA.

UNA does not have to be sent to a multicast address. We could make it to unicast to NAR’s address.

-Rajeev



On 3/21/07 8:27 AM, "ext K Raghav-A21492" <raghavkmotorola.com> wrote:

Section 4 of RFC 4068 states

"Once the MN has confirmed its NCoA, it SHOULD send a Neighbor  Advertisement message.  This message allows MN's neighbors to update their neighbor cache entries with the MN's addresses&quot;

Could you please clarify as to what purpose this message aims to serve. The MN whilst present in the NARs link will correspond only with the AR over its NCOA. Besides the other nodes on a the NAR's link are unlikely to correspond with this MN over NCOA.

The applications on the MN will be over its Home Address. That leaves us with DAD alone. So updating the Neighbor Caches might be a futile exercise.

With regard to 4068bis; Clarification on this will aid in understanding the reasoning behind UNA being a multicast message, over FNA, an unicast message.

Thanks and Regards,
Raghav