[ppml] PIv6 for legacy holders (/w RSA + efficient use)

[michael.dillon at bt.com]

> > With IPv6, ULA addressing defined in RFC 4193 
> > http://www.ietf.org/rfc/rfc4193.txt allows one to isolate 
> most of the 
> > internal network using non-routable addresses. Combine that 
> with the 
> > typical enterprise configuration of firewall, web proxy, 
> and internal 
> > email service. You don't even need NAT in this scenario.
> 
> And you don't need IPv6 in this scenario. How is this any 
> better than using RFC 1918 IPv4?

It is better because you are using IPv6, gaining experience with IPv6,
and enabling your internal network to grow (add devices) without using
any more IPv4 addresses. Many companies are facing exhaustion of the RFC
1918 space as well so transitioning to IPv6 is motivated by more than
one exhaustion event.

--Michael Dillon