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Re: [MEXT] using MR-HA tunnel vs. combining BU // Re: WGLC for draft-ietf-mext-nemo-pd-01.txt

Hi Behcet,

On 2008/12/12, at 19:34, Behcet Sarikaya wrote:
We have an implementation of NEMO+DHCPv6PD, and here the "mechanism to determine the Mobile Network Prefix(es) owned by the Mobile Router" is a simple message from the DHCPv6 server to the HA that advertises the MNP/HoA pair to the HA.

[behcet] I am curious what is this message? Can you please give more details?

The DHCPv6 server is co-located with the HA on the same computer. I use a UNIX socket for inter-processus communication with a simple TLV message. 

In our implementation, at home registration the HA checks with the DHCP server if a prefix is available for this HoA. If so, registration is done (but not forwarding). Once the DHCPv6 server has delegated a prefix to the MR, it informs the HA that it can setup forwarding for the delegated MNP.

[behcet] I have a question: If HA were a requesting router (not a delegating router as in Nemo-pd draft), how would you change your implementation architecture? 
I have a feeling that you are using HA as a requesting router .

In our testbed, the HA is a delegating router, and the client & relay are located at the HA. DHCP messages are exchanged through the MR-HA tunnel.

If the HA were a requesting router, I guess the testbed, implementation and interaction with the mobility daemon would be completely different, so I can't really tell how I would change the current one.


If HA is a requesting router, all you need at the HA is DHCP Client (and possibly colocated with relay if the delegating router is not on-link) 

I guess you refer to the solution exposed in draft-sarikaya-mext-prefix-delegation? This one suppose that the prefix delegation at the MR happens with BU/BAck messages, which is not the case in our implementation.

Note that I do not discuss here which solution is the best, but only present feedback from implementation of one of the solution. If I had chosen the delegation through the BU/BAck, I would certainly have coupled it with a DHCP server as you describe in your draft.


So I believe, in fact you are agreeing with Ryuji.

Agreeing on what point ? 


Regards,
-- 
Romain KUNTZ
LSIIT - Networks and Protocols Team
 

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