Re: [v6ops] draft-moreiras-v6ops-rfc3849bis-00

Mark Andrews <marka@isc.org> Wed, 14 August 2013 01:15 UTC

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To: Owen DeLong <owen@delong.com>
From: Mark Andrews <marka@isc.org>
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In-reply-to: Your message of "Tue, 13 Aug 2013 11:05:22 -0700." <4B2E191C-B8BE-4B71-91D9-CD0995296F32@delong.com>
Date: Wed, 14 Aug 2013 11:14:33 +1000
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Cc: Alejandro Acosta <aacosta@rocketmail.com>, v6ops@ietf.org
Subject: Re: [v6ops] draft-moreiras-v6ops-rfc3849bis-00
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In message <4B2E191C-B8BE-4B71-91D9-CD0995296F32@delong.com>om>, Owen DeLong write
s:
> > 
> > With ULA you end up with:
> > 
> > 	site1: P1, P2 announce P2 to site2
> > 	site2: P1, P3 announce P3 to site1
> > 
> > When you have two sites colliding on P1.  (P1, P2 and P3 are different
> > ULA prefixes).
> 
> No, with ULA, the average IT group is going to start with:
> 
> site 1: P1
> site 2: P1
> 
> They're going to not want to roll out a whole new addressing plan to both
> sites, so, instead, they will do what they did in IPv4.
> 
> P1<->NAT<->P2<->NAT<->P1
> 
> You need to come down out of whatever ivory tower you live in and look
> at how things happen in the real world.

Really how is what I am saying different to moving providers with
PA addresses?  We expect renumbering event to occur then.  We expect
ipv6 vendors to support this sort of renumbering.

You bring up the new prefix along side the old prefix.  You
decommission the old prefix.  The only difference is delaying
decommissioning the old prefix longer if not forever.

> > You have IP stacks that are designed to deal with multiple prefixes
> > and to choose particular source addresses for particular destination
> > addresses.
> > 
> > You have applications that are designed to deal with multiple
> > addresses.
> > 
> > IPv4 only stacks don't have all of these features which forces one
> > to use NAT.
> 
> None of that overcomes the realities if modern corporate IT staffing.
>
> > With IPv6 they are there so you can depend on them and take advantage
> > of them.  If P2 and P3 differ only in the 48th bit longest match
> > will select the right source address.
> 
> If you know about them.
> If you're willing to put in the effort to use them.
> If you completely understand them.
> IF and only IF all of your applications are actually that savvy.
> etc.

If you are using ULA along side GUA then yes the applications and
stacks will do the right thing already which is almost certainly
what you will be doing if you are using ULA in the first place.

> For most enterprises, the answer to at least one of those IFs will fail.
> 
> Owen
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org