Re: security considerations wrt/ draft-ietf-ipdvb-arch-01.txt

[Gorry Fairhurst <gorry@erg.abdn.ac.uk>]

On clarification of the AR work scope:

Rod.Walsh@nokia.com wrote:

<snip>

> * I get the impression that it is an intentional limitation of the AR that it 
> applies only to the current TS (as you would expect cf ARP). This is 
a sensible
> limitation but it's worth stating explicitly.
> (i.e. that address resolution for other TSes, e.g. for moving TS and 
mobility
>  optimisation, is not in scope).

<snip>

> Cheers, Rod.

My understanding was that the scope of any new work will be to resolve 
*within* a transport multiplex (i.e. a single physical bearer). The 
proposals to date do not allow the possibility of a TS logical channel 
(i.e. PID value) to be changed during (re)multiplexing - there are 
scenarios in which this can happen - and there are specific solutions 
already in this space (guidance on how to use these is within scope).

Providing AR services that span multiple physical bearers is 
significantly more complex and typically requires processing of SI table 
information - solutions also already exist in this space e.g. proposed 
by ATSC and DVB (guidance on how to use these is within scope).

I'd encourage an approach which is simple.

Rod is that any help? Do other people have thoughts?

Gorry