North American Network Operators Group
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: who gets a /32 [Re: IPV6 renumbering painless?]

  • From: Stephen Sprunk
  • Date: Fri Nov 19 15:56:39 2004 
Thus spake "Iljitsch van Beijnum" <[email protected]>

On 19-nov-04, at 5:38, Stephen Sprunk wrote:
According to multi6, you will get PA space from each of your ISPs and overlay a prefix from each on every subnet. I'll save y'all another rant on the workability of that model...


Some fear that you would more likely just generate a ULA, use that
internally, and NAT at the borders.



It isn't contrary to multi6 gospel to have the address swapping be done by
boxes somewhere in the middle rather than have all hosts do it for
themselves.


Isn't "address swapping ... by boxes somewhere in the middle" called NAT?




Note that at this time the main focus of the IETF multi6 working group is
taking regular communication (such as a TCP session between PA addresses
at both ends) and then repair outages using additional PA addresses.



That's interesting, but how long until we see it in Windows (the most
ubiquitous host OS on the planet)? It took nearly ten years for MS to
implement IPv6 as it is; will it take another decade for multi6 to have a
solution that works and is _deployed_?




Another way to do this is to use non-routable addresses (such as unique
site locals) as the addresses that transport protocols such as TCP and
applications see, and start remapping those to/from PA addresses from the
start. However, this isn't backward compatible and it's more complex so
we're not focussing on this approach at this time. I'm pretty confident
that we can add this as an additional option later, though.



I'm confident you could add it, but I'm not confident that (a) it'll end up
implemented by vendors or (b) it won't have the same disadvantages of NAT.



S



Stephen Sprunk "God does not play dice." --Albert Einstein

CCIE #3723 "God is an inveterate gambler, and He throws the

K5SSS dice at every possible opportunity." --Stephen Hawking