Re: [pcp] PCP proxying / relaying

["Dan Wing" <[e-mail]>]

> -----Original Message-----
> From: [e-mail] [mailto:[e-mail]]
> Sent: Wednesday, March 16, 2011 9:50 AM
> To: Dan Wing
> Cc: 'Alain Durand'; [e-mail]
> Subject: Re: [pcp] PCP proxying / relaying
> 
> 
>  In your previous mail you wrote:
> 
>    > => If you do that you'll be in trouble to send packets to this
> address.
> 
>    If we were to standardize on 1.1.1.1, it should be a single command
>    during startup:
> 
> => this is not the problem: if you use *one* address you can't at
> the same time assign this address at one of your interfaces *and*
> be able to forward packets further to the *same* address.
> 
>    which the daemon would then listen on.
> 
> => but the daemon won't be able to send request to the *next*
> PCP server at 1.1.1.1.

This seems quite similar to how today's ALGs function.  Can this be modeled
in the CPE router like an ALG?

A difference from a normal ALG is that sometimes a PCP response needs to be
generated by the CPE router itself (rather than forwarding the request to
the upstream PCP server).  But perhaps that is why the earlier PCP Proxy
paper (draft-bpw-pcp-proxy-00) mentioned 'faking' a response.

-d

> Regards
> 
> [e-mail]