Re: [MEXT] comments todraft-bernardos-mext-aero-nemo-ro-sol-analysis-01.txt

[Carlos Jesús Bernardos Cano <[e-mail]>]

Hi Ryuji,

El lun, 17-11-2008 a las 11:05 -0600, Ryuji Wakikawa escribió:
> Hi Carlos and Marcelo,
> 
> Thanks for writing this document.
> It summarizes the list of right questions to aviation industry.
> Unfortunately, I don't have answers to any of them :-)

Thanks for reading the draft and for your comments.

Some in line comments below...

> 
> Some comments
> 
> In section 3.1,
>     o  if a craft attached to an ANSP access network is communicating
>        with a CN attached to the same ANSP, is it required for the NEMO
>        RO solution to survive when the link of the ANSP to its gACSP  
> goes
>        down? or put in a different way, would it be OK for such a
>        communication to be broken?  It should be noted that the default
>        MRHA path used by the NEMO Basic Support protocol would likely
>        fail in this scenario.
> 
> Are you sure we need to consider the scenario of gACSP failure?
> gACSP failure seems very critical errors and MUST NOT be happened...

The point is that we don't know if this should be considered or not, we
just pointed out that this is a possible situation (we don't know if
this is likely to happen). This is something that the aviation people
should let us know...

> 
> 
> In section 3.2,
>     entities belong to the same administrative domain.  However, this
>     does not mean that this scenario is excluded from having trust
>     issues, since a particular solution might require to inject routes  
> in
>     some parts of the network (e.g., RO entities owned by an airline and
>     placed in networks not managed by the airline, anycast routing,
>     etc.), and this could require additional trust relationships.
> 
> This additional trust relationships are not always required to be  
> dynamic one.
> It might be just business agreements, isn't it?

They might be, yes, but they are required, right?. The point is that we
don't know whether these trust relationships/business agreements can be
assumed in the aviation scenario or not.

> 
> I think we need more information from aviation industry such as
> - How many CNs does each MR communicates with?
> - How many ANSPs does each MR communicate with?
> - The least HOPs path is not always the shortest latency path.
>    It depends on the topology (L1-L3) of gACSP and ANSPs.
>    Since the aviation network is somehow closed network and designed  
> by themselves,
>    we need more detailed information of topology information.
> 

	I agree this information would be also useful for the solution design.

	Thanks,

	Carlos

> regards,
> ryuji
> 
> 
> 
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-- 
 Carlos Jesús Bernardos Cano     http://www.netcoms.net
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