RE: Comments on draft-ietf-mip6-bootstrapping-split-01.txt

> >>>HoA as for all other addresses configured based on [ADDRCONF].
> >>
> >>we dont have to send everything thats there in a router
> >>advertisement through IKEv2 attributes. the mobile node
> >>can always run Mobile Prefix Discovery later on to find
> >>out the complete information about the home prefix.
> >>FWIW, Mobile Prefix Discovery was designed so that it
> >>can be a substitute for router advertisements when the
> >>mobile node is not at home.
> >>
> > 
> > 
> > But why the MN should run MPD to know the valid lifetime of 
> a prefix it
> > has already configured?
> > I was thinking that MPD would be used to discover new 
> prefixes, not the
> > prefix discovered via IKEv2.
> 
> because we dont to replicate everything that is there in
> the router advertisements through IKEv2 messages. :)
> 
> instead lets use MPD to get complete prefix information
> once you have setup security associations with the HA.
> this includes prefixes that you already know about. for
> example MPD even replicates the various flags (M, O flags).
>

OK, it seems that also Francis agrees with you. So let's keep only the
preferred lifetime.
I'll update the draft with the new format of the attribute. I'll also go
through the draft again to understand if we need to clarify in a better
way the usage of MPD.

--Gerardo 
 
> Vijay
> 
> > 
> > --Gerardo
> > 
> > 
> > 
> >>Vijay
> >>
> >>
> >>>--Gerardo
> >>>
> >>>
> >>>
> >>>>RFC 2461 says
> >>>>
> >>>> Preferred Lifetime
> >>>>                     32-bit unsigned integer.  The length 
> >>
> >>of time in
> >>
> >>>>                     seconds (relative to the time the 
> >>>>packet is sent)
> >>>>                     that addresses generated from the prefix via
> >>>>                     stateless address autoconfiguration remain
> >>>>                     preferred [ADDRCONF].  A value of 
> all one bits
> >>>>                     (0xffffffff) represents infinity.  See 
> >>>>[ADDRCONF].
> >>>>
> >>>>it might be sufficient to just send the preferred
> >>>>lifetime.
> >>>>
> >>>>Vijay
> >>>>
> >>>>
> >>>>
> >>>>>      0                   1                   2           
> >>
> >>        3
> >>
> >>>>>      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 
> >>>>
> >>>>6 7 8 9 0 1
> >>>>
> >>>>
> >>>>>     
> >>>>
> >>>>+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >>>>
> >>>>
> >>>>>     |     Type      |    Length     | Prefix Length |L|A| 
> >>>>
> >>>>Reserved1 |
> >>>>
> >>>>
> >>>>>     
> >>>>
> >>>>+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >>>>
> >>>>
> >>>>>     |                         Valid Lifetime              
> >>>>
> >>>>         |
> >>>>
> >>>>
> >>>>>     
> >>>>
> >>>>+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >>>>
> >>>>
> >>>>>     |                       Preferred Lifetime            
> >>>>
> >>>>         |
> >>>>
> >>>>
> >>>>>     
> >>>>
> >>>>+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >>>>
> >>>>
> >>>>>     |                           Reserved2                 
> >>>>
> >>>>         |
> >>>>
> >>>>
> >>>>>     
> >>>>
> >>>>+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >>>>
> >>>>
> >>>>>     |                                                     
> >>>>
> >>>>         |
> >>>>
> >>>>
> >>>>>     +                                                     
> >>>>
> >>>>         +
> >>>>
> >>>>
> >>>>>     |                                                     
> >>>>
> >>>>         |
> >>>>
> >>>>
> >>>>>     +                            Prefix                   
> >>>>
> >>>>         +
> >>>>
> >>>>
> >>>>>     |                                                     
> >>>>
> >>>>         |
> >>>>
> >>>>
> >>>>>     +                                                     
> >>>>
> >>>>         +
> >>>>
> >>>>
> >>>>>     |                                                     
> >>>>
> >>>>         |
> >>>>
> >>>>
> >>>>>     
> >>>>
> >>>>+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >>>>
> >>>>
> >>>>>--Gerardo
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>>>- Regarding DDNS updates, I share some of Francis concerns, 
> >>>>>>
> >>>>>>but I also
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>share the concerns of the DT stated in section 9.5.
> >>>>>>>(authentication/authorization of updates and 
> >>>>>>
> >>>>>>redirection-based flooding
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>issue, if MN updates DNS). IMHO some more 
> >>>>>>
> >>>>>>thoughts/discussions should be
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>spent on this issue. For instance, something like a 
> cookie-based
> >>>>>>>reachability test (done by DNS server) of the address 
> >>>>>>
> >>>>>>claimed by MN in
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>the DNS update could be considered to address the 
> >>
> >>redirection-based
> >>
> >>>>>>>flooding attack concern. 
> >>>>>>
> >>>>>>agree. but I think modifications to DNS are beyond
> >>>>>>the scope of MIP6 bootstrapping work.
> >>>>>>
> >>>>>>Vijay
> >>>>>>
> >>>>>>
> >>>>>>_______________________________________________
> >>>>>>Mip6 mailing list
> >>>>>>Mip6@xxxxxxxx
> >>>>>>https://www1.ietf.org/mailman/listinfo/mip6
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
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