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Re: [MEXT] Comments on draft-ietf-monami6-multiplecoa-13



Hi Romain,

On 2009/05/12, at 14:08, Romain KUNTZ wrote:

Hi Ryuji,

On 2009/05/11, at 22:59, Ryuji Wakikawa wrote:
First, I'd like to express that I support Arnaud's opinion about section 5.6 (Simultaneous Home and Visited Link Operation). I also don't see what is the motivation to re-route and tunnel traffic from the HA to one of the MN's CoA, while the MN is only one hop from the HA. Even if there is a specific use-case, at the time this topology was suggested, a simple solution that came out was to configure a CoA on the Home link and use a tunnel via the home link. I don't think the little overhead of this solution justifies the complexity of the one proposed in the draft.

This was discussed at WG. We agreed to have this feature at the end.
I understand the complexity, but this is how WG agreed.

It is not possible to change the consensus at this moment. We passed all last call.

Ok, this has also been extensively discussed in another thread - I'll follow the WG agreement then.

Two other minor comments on the draft below:

- Section 6.2 (Processing Binding Update)

   *  If the 'O' flag is set in the Binding Update, the home agent
      removes all the existing bindings and registers the received
      binding(s).

It is not explicitly said that the MN can use the O flag with a CN. I think nothing prevents the MN to use it, so we should replace "home agent" with "receiving node".

You didn't ack the above comment, did you skip it by mistake?

I've already replaced it :-)

thanks!
ryuji





If all the above operations are successfully completed, a Binding
Acknowledgement containing the Binding Identifier mobility options
MUST be sent to the mobile node.

The BAck must be sent only if the 'A' flag was set in the BU, right? or does the MCoA spec mandates sending BAck in all cases?

BA is sent only A flag is set.
I will update this to

If all the above operations are successfully completed, a Binding
Acknowledgement containing the Binding Identifier mobility options
MUST be sent to the mobile node if 'A' flag is set in the received Binding Update.

Please let me know if you have further comments on this.

Looks fine with me!

Thanks,
romain