[rrg] RANGER-06

[Templin, Fred L]

Robin,

Thank you for your consideration of RANGER. Please see
below for my responses: 

> -----Original Message-----
> From: Robin Whittle [mailto:rw at firstpr.com.au] 
> Sent: Sunday, February 01, 2009 3:51 AM
> To: RRG
> Cc: Templin, Fred L
> Subject: RANGER-06
> 
> Short version:    I read the RANGER I-D and came away without
>                   any substantial understanding of what RANGER
>                   is supposed to achieve, in terms of scalable
>                   routing and addressing,

Scalable routing and addressing in RANGER has exactly the
same considerations as LISP, APT, and the other map/encaps
variants. It uses IP-in-IP encapsulation, with the outer
IP addresses taken from prefixes already published in BGP
routing tables in the global DFZ, and with inner IP
addresses taken from prefixes taken from a mapping table
kept separate from the global routing table. You have
heard me say it before, but IMHO to get to true scalable
routing and addressing we will need to eventually transition
to using IPv6 as the inner IP protocol for the long term.
But, nothing in the RANGER architecture depends on this.