Re: [BEHAVE] draft-ietf-behave-nat64-discovery-heuristic in PCP-enabled networks?

[Simon Perreault <[e-mail]>]

On 09/07/2012 03:11 AM, [e-mail] wrote:
> IMHO PCP proposal for Pref64::/n falls to similar category as DHCPv6 in
> the draft-ietf-behave-nat64-learn-analysis-03.txt. I.e. it may not be
> deployed alongside NAT64, it requires PCP client implementation on a
> node, and so forth.

Yes they are similar, but there are differences:

>    The PROs of the proposal are listed below:
>
>    +  Can be used to solve Issue #1, Issue #2, Issue #3 and Issue #4 via
>       DHCPv6 information lifetime.

Same for PCP.

>    +  Does not involve DNS system.  Therefore, applications that would
>       not normally initiate any DNS queries can still learn the NAT64
>       prefix.

Same for PCP.

>    +  DHCPv6 is designed to provide various kinds of configuration
>       information in a centrally managed fashion.

Not really the same, but this is fuzzy...

>    The CONs of the proposal are listed below:
>
>    -  Change of NSP requires change to DHCPv6 configuration.

Here PCP is different: since the PCP server presumably has direct access 
to CGN configuration, there is no need to change the PCP server 
configuration.

>    -  Requires at least Stateless DHCPv6 client on hosts.

PCP requires a PCP client on hosts.

>    -  Requires support on DHCPv6 clients, which is not trivial in all
>       operating systems.

PCP requires support on PCP clients.

>    -  The DHCPv6-based solution involves changes and management on
>       network side nodes that are not really part of the NAT64/DNS64
>       deployment (or issues caused by their existence).

This does not apply to PCP.

>    -  A new DHCPv6 option is required and the corresponding changes to
>       both DHCPv6 clients and servers.

And a new PCP option/opcode is required.

Simon
-- 
DTN made easy, lean, and smart --> http://postellation.viagenie.ca
NAT64/DNS64 open-source        --> http://ecdysis.viagenie.ca
STUN/TURN server               --> http://numb.viagenie.ca