Re: [Seamoby] Candidate 2 for Draft 8 for CARD

[Marco Liebsch <marco.liebsch at ccrle.nec.de>]

Hi Rajeev,

Rajeev Koodli wrote:

> Hi Jim,
>
> I was going over the CARD protocol, mainly with the piggybacking of
> CARD Options using the FMIPv6 proxy messages. For piggybacking
> to work, the Type value for CARD Request and CARD Reply Must Not
> collide with the "Option-Type" assignments in FMIPv6. Currently, there
> are only 3 values assigned in FMIPv6.
> The "Seamoby IANA Allocations" draft leaves CARD Request and Reply
> with TBD9 and TBD10. I think we should request them to assign
> 9, 10 or some higher number like that. We do not need to co-ordinate the
> Sub-options assignments.
>  
I agree. We had this requirement in an earlier version of the CARD draft 
as part of the
IANA considerations section. Since these have been shortened for CTP and 
CARD and
incorporated into the consolidated Seamoby IANA allocations document, we 
should of
course keep mentioning this to avoid conflicts.

> Also, why not send a RtSolPr with the CARD Request Option and
> Sub-options and see if the router replies, instead of using a probing
> mechanism to discover "piggybacking". I know this is too late, but
> a thought nevertheless.
>
>  
The initial discovery of piggybacking capability is required at the very 
beginning without
utilizing piggybacking. It could be done by means of try and error, as 
you proposed.
But subsequent indication about handover candidates' piggybacking 
capability is part of
the CARD procedure, utilizing the P-flag. Hence, we need the flag anyway 
and can
use it during the initial CARD handshake for "piggybacking capability 
discovery".

If there is a way to have a CARD protocol operation smoothly integrated
with FMIPv6 in the future, other means (protocol version?) could 
indicate whether or
not the full CARD operation is supported. This assumes CARD support to 
be mandatory
for future FMIPv6 versions.

Thanks and regards,
marco

> Regards,
>
> -Rajeev
>
>
>
>
>
> James Kempf wrote:
>
>  
>
> > I've edited draft-08 for CARD inserting a few suggested changes by Marco and
> > Ajoy. Candidate 2 is available at:
> >
> > http://www.geocities.com/kempf42/draft-ietf-seamoby-card-protocol-08-cand2.txt
> >
> > Please take a look. If I don't hear anything from anyone by next Fri., Sept.
> > 10, I will send the draft to the IESG.
> >
> >            jak
> >
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>
>
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