[no subject]

Right, it's a typo. It should say CARD Reply. I'll fix it.

> Well, obviously keeping the protocol simple is a design goal. For that
> it's fine to
> retransmit the full sequence. However, this does not solve the issue to
> allow MN's
> detecting a particluar lost message in a reply sequence. Hence, what
> about the following:
> Allow ARs, which reply a sequence of CARD Reply messages to a CARD
> Request, to
> increase Sequence Numbers of CARD Replies, but starting the with the
> same sequence number
> as in the request. With the help of the L-flag this allows detection of
> the sequences' end
> AND of a missing segment in between. Further, this still allows
> correlation of Requests with
> Replies on the MN, since the first Reply matches the Request's sequence
> number.
>
> Only remaining issue is in case the first CARD Reply message of a
> sequence gets lost, but the second is
> received, having the sequence number incremented. This should be ignored
> then by the MN and
> the CARD Request should be retransmitted according to the procedure
> described in section 4.2.1.
>
> Did I miss something?
> What do you think?
>

I don't think you can use incrementing the sequence number. Suppose the
messages are delivered out of sequence. The MN can't determine if the
message matches an outstanding request, so it drops the packet. One could
suppose a more complex processing mechanism, but it't not really necessary.
Most CARD Replies are likely to be small, with the exception of the Router
Certificate option. The latest version (draft-08) has support for "X of N"
(ex.: 2nd of 5) so that a MN can ask for individual certs in a certification
path, if one is dropped.


            jak



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