Re: Comment on draft-iab-ipv6-nat-00

Sat, 21 Mar 2009 10:14:03 -0700

Brian E Carpenter  -  le (m/j/a) 3/20/09 2:40 PM: 
NAT does not offer ANY multihoming benefits whatsoever, in fact, NAT
breaks multihoming because after a rehoming event, the addresses are
translated differently.
    

It's correct that NAT changeovers break existing sessions. But your blanket
statement isn't true. NAT-based multihoming has the major benefit that
the number of extra BGP4 routes caused by a multihomed site is exactly
zero. That feature may have low value today, but will have very high value
if we collectively succeed in exceeding BGP4's scaling limits.
Full agreement.
And it's possible to do even better than NATs for multihoming in IPv6.
(That's a feature of SAM.)
 
Also, NAT-based multihoming has value for large international corporate
networks with dozens or hundreds of interconnection points to
the public network. It basically solves their address management
problem when dealing with multiple ISPs in multiple locations. That's
running code today.
I don't understand the configuration of this case.
Any reference to clarify it (or an explanation)?

RD

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