Re: [Mip6] draft-dupont-mip6-dhaadharmful-00.txt

[Alexandru Petrescu <[e-mail]>]

Francis Dupont wrote:
>  In your previous mail you wrote:
> 
>    >    If yes, that
>    >    draft alone does not help for bootstrapping IMHO.  If DHAAD can be made
>    >    to work with non-anycast addresses then DHAAD+MPD is a good idea to do
>    >    bootstrapping simple (MPD is Mobile Prefix Discovery).
>    >    
>    > => I don't understand why MPD is for when you have HA discovery/assignment
>    > (the mobile prefix is simply the prefix of the HA address)... I should
>    > have missed something, for instance there is more than one MP?
>    
> => I mean Mobile Prefix for MP.
> 
>    "MP" could be misinterpreted as "Mobile Prefix" which isn't.
>    
> => it is.

Well, the Prefix is the prefix of a fixed home link, advertised in fixed
RAs sent by its routers.  A "Mobile Prefix" would be more like the
prefix of the Mobile Network Prefix which moves together with the moving
network, I think.

But ok, it's also like a "Mobile Network" moves or is fixed depending
who one talks to.

>    DHAAD doesn't provide a prefix length field in DHAAD Reply, so the MN
>    can't know it.  MPD is the equivalent of local RS/RA for a MN that is
>    away from home.
>    
> => but in fact the prefix length is 64 bits so this is not enough
> to explain the necessity of MPD.

Well, ok.  When plens are shorter than 64bits please pad with 0s between
prefix and IID, and don't use these zeros as network identifier.

>    HA-Switch and DHAAD+MPD could also be used when the home link is
>    re-numbered.
> 
> => this is a very unlikely event.

Well, ok, a discussion could be held about what are the minimal parts of
MIP6 which are really necessary and in what contexts.

Alex

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