Re: [DNA] Comments on Combined DNA Solution draft

[Brett Pentland <brett.pentland@eng.monash.edu.au>]

>>>2. Consider the following case.
>>>Router R1 (of Link1) is sending Prefix P1 whose life time is 15 seconds.
>>>A host H came to Link1 and included P1 in DNAHostPrefixList.
>>>P1 expired gracefully and assigned to Link2. If H moves to Link2 and
>>>receives complete RA, it will find the match in DNAHostPrefixList and
>>>will assume same link. Host will not delete P1 since expiry time for
> 
> entries
> 
>>>in DNAHostPrefixList is 1.5 hours.
>>
>>No, the host will expire P1 at its expiry time as indicated by the
>>liftime it learned in the RA it received on Link1.  (see 6.2.1, para 3)
> 
> 
> If the prefix P1 is learned prefix for R1, then it will advertise P1 in LPO.
> Host (H) will not be receiving life time in the RA sent by R1. If H has not
> received
> any RA with P1 in PIO within 15 seconds, it will not delete P1 from
> DNAHostPrefixList for the next 1.5 hours.

Ah, ok in that case that case you have a point.  Usually, the host
would receive an RA from each of the routers on the link within 3
seconds but I guess one or more of those could be lost.  I'm not
sure how realistic such a short prefix lifetime is, but if folks think
this is an issue, we could recommend that if hosts have an entry
in their DNAHostPrefixList for which there has been no PIO received
after X seconds, that they send another RS.

My gut feeling is that this isn't worth worrying about.
Brett.