Iljitsch,
On 2009-03-21 05:18, Iljitsch van Beijnum wrote:
...
> 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.
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.
Sad but true.
Brian
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