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Today's Topics:
1. Re: chicken egg problem (richard lucassen)
----------------------------------------------------------------------
Message: 1
Date: Thu, 2 Jun 2016 14:22:41 +0200
From: richard lucassen <mailingli...@lucassen.org>
To: dhcp-users@lists.isc.org
Subject: Re: chicken egg problem
Message-ID: <20160602142241.588cd324136565d4cc9a7...@lucassen.org>
Content-Type: text/plain; charset=US-ASCII
On Thu, 2 Jun 2016 12:04:42 +0100
Simon Hobson <dh...@thehobsons.co.uk> wrote:
[random assignment of DNS servers]
> You'll find it's more subtle than that !
> Assuming a preponderance of Windows clients, try assigning "10.0.0.1,
> 10.0.0.2" and then take 10.0.0.1 offline for a while. When you turn
> it back on, you'll probably find that few clients will use it again -
> until 10.0.0.2 goes offline.
>
> I know of people who've empirically found that if they specify a
> local server before external resolvers, they can get a form of split
> DNS - where the Windows clients check with the local server first and
> then go to an external resolver if the first one doesn't have the
> answer. They then found that this breaks if the internal server ever
> goes offline - because then the clients put it to the end of the list
> "permanently" and it only gets promoted if others above it fail.
Sounds like a particular interpretation of an RFC. I've seen that
before :)
> IIRC there's also reports of Windows machines not changing settings
> (I suspect DNS servers was included) when the values change in the
> offers. Only if they lose their connection (lease expired, moved
> network, old lease no longer valid and NACKed) will they get a new
> lease and the new settings.
I think I'll stick to the simple idea to inverse DNS settings to some
ranges. Thnx for your time anyway!
R.
--
richard lucassen
http://contact.xaq.nl/
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