Re: [BEHAVE] Handwaving? [Re: where to have the NAT66 discussion (was Re: Please move this thread to BEHAVE mailing list ... )]

[Ralph Droms <rdroms at cisco.com>]

Iljitsch - I understand the theory behind what you're describing...in  
practice, it's a hard problem to know where all the prefixes are that  
should be changed; worse yet, it's hard to know which prefixes in  
which parts of the configuration should be replaced with new prefixes,  
and which shouldn't be changed.

In theory (where theory == reductio ad absurdum), renumbering is just  
a network and host management problem.  In practice, while SLAAC and  
prefix delegation address some (I'll wager a fairly small percentage;  
for that matter, DHCPv4 addressed the host renumbering problem years  
ago) renumbering problems, most of the places where IP addresses are  
configured were never designed with renumbering or any sort of  
"signaling" in mind, and will be very difficult to automate.

- Ralph

On Dec 2, 2008, at Dec 2, 2008,2:11 PM, Iljitsch van Beijnum wrote:

> On 2 dec 2008, at 20:02, Scott Brim wrote:
>
> > > One way to fix that would be multipath transport protocols. Rather  
> > > than
> > > try to guess what works best, just use all of them (or at least  
> > > several)
> > > and get better performance without having to make difficult choices.
>
> > This doesn't help with site renumbering problems, just endpoint
> > renumbering.
>
> NAT also helps very little with renumbering. The only thing that it  
> buys you is that you don't have to renumber routers and other  
> devices that have their addresses configured staticially sitting  
> behind the NAT. But routers can receive prefixes over DHCPv6 and  
> then use those prefixes to number their stuff rather than have this  
> done by hand, so there is _very_ little need for static address  
> configuration.
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