Title: DNS and site coverage behaviour
Assuming you haven't disabled Auto Site Coverage, the DCs in the site nearest the DC-less site (as defined by site link cost) will cover the DC-less site. AD does this by publishing additional SRV records in the appropriate site "containers " in  DNS.
 
You didn't indicate what your domain situation was... make sure that the clients in the DC-less site authenticate to domains that have DCs located in the covering site. Otherwise the clients will start authenticating over the WAN.
 
-gil
 
Gil Kirkpatrick
CTO, NetPro
"To fly, flip away backhanded. Flat flip flies straight. Tilted flip curves. Experiment!"


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ruston, Neil
Sent: Thursday, March 03, 2005 5:04 AM
To: '[email protected]'
Subject: [ActiveDir] DNS and site coverage behaviour

I am about to investigate and test DNS site coverage and would like to seek the views and opinions of others.

Scenario:
W2k DCs (SP3)
Multiple domains - all w2k native
Location1 has 2 buildings, currently each building being represented by a separate site. Let's call them siteA and siteB.

Currently, each of these 2 sites has a DC installed locally.
SiteB has a site link with siteA (cost 10)
SiteB has a site link to siteC [at some other location] (cost 100)

Proposal and requirements:
Decomm the DC in siteB and ensure that the DC in siteA provides DNS coverage to users in siteB [I won't explain my reasoning for the decomm - that would detract from my main point :) ]

Questions:
Will the DC in siteA need to be configured such that it auto covers DNS wrt siteB (registry change)?
Or
Will that DC in siteA automatically cover for siteB in DNS, given that siteA has the lowest cost link to siteB?

I had always assumed the latter to be true, but this view has been challenged and the former was suggested as necessary, instead :)

Any offers?

Thanks,
neil

Neil Ruston - MVP dir services

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