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Re: [v6ops] ULA draft revision #2 Regarding isolated networks

Mark Andrews <marka@isc.org> Tue, 27 May 2014 06:54 UTC

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To: Mikael Abrahamsson <swmike@swm.pp.se>
From: Mark Andrews <marka@isc.org>
References: <8AE0F17B87264D4CAC7DE0AA6C406F453D8B6B9A@nkgeml506-mbx.china.huawei.com> <m261ks7xww.wl%randy@psg.com> <53840070.90801@gmail.com> <m2y4xn7wep.wl%randy@psg.com> <53840723.8010606@gmail.com> <CAKD1Yr1O_poMR200sjU=ttRvGaeQRkC1ZfXC0Ok4uQxdq3K=NQ@mail.gmail.com> <m2mwe37tbn.wl%randy@psg.com> <CAKD1Yr2t3-vxuG=iDi4biBNFpJwuzuHgfpB74i_uydWWRV7qZg@mail.gmail.com> <8AE0F17B87264D4CAC7DE0AA6C406F453D8B6E02@nkgeml506-mbx.china.huawei.com> <m2fvjv7q4h.wl%randy@psg.com> <20140527060418.0157A16B6C6E@rock.dv.isc.org> <alpine.DEB.2.02.1405270846491.29282@uplift.swm.pp.se>
In-reply-to: Your message of "Tue, 27 May 2014 08:49:37 +0200." <alpine.DEB.2.02.1405270846491.29282@uplift.swm.pp.se>
Date: Tue, 27 May 2014 16:54:41 +1000
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Archived-At: http://mailarchive.ietf.org/arch/msg/v6ops/JK2l84I4stEYwS0ZDUmecn97lpM
Cc: v6ops WG <v6ops@ietf.org>
Subject: Re: [v6ops] ULA draft revision #2 Regarding isolated networks
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In message <alpine.DEB.2.02.1405270846491.29282@uplift.swm.pp.se>, Mikael Abrah
amsson writes:
> On Tue, 27 May 2014, Mark Andrews wrote:
> 
> > You seem to assume that you will need renumber/remove the existing ULA 
> > addresses.  For all practical senarios you will never need to do this. 
> > Even if two or more sites using the same ULA prefix connect you just add 
> > additional ULA prefixes to communicate.  The old ULA addresses are not 
> > used for inter site communication.
> 
> That means that all resources that needs to be accessed from one 
> organizaton to the next uses this new common ULA in order for source 
> address selection to work properly. Only way to solve this that I can see 
> it to use split horizon DNS, which is yet another mess operationally, in 
> addition that all the new services addresses will need to be configured in 
> firewalls etc.

You need split horizon if you use ULA regardless of whether you
connect to another ULA site or not.  ULA + GUA requires split
horizon.

> -- 
> Mikael Abrahamsson    email: swmike@swm.pp.se
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

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