Re: Same computer names allowed?
From: Goatman (Goatman_at_discussions.microsoft.com)
Date: 03/11/05
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Date: Fri, 11 Mar 2005 10:53:07 -0800
Mr. Smith,
Thanks for your reply.
I'd have to agree from a netbios point of view that what you say would be
possible. One of my troubleshooting steps on one occassion was to check the
WINS server registrations and there were indeed entries for the machine name
with the 2 active IP addresses.
But what surprises me is that AD allowed the operation in the first place.
There should have been a name conflict detected.
One thing that we have come to realize is that it's always a machine with a
DHCP address stepping on an existing machine that has a hard coded IP address.
"Mr. Smith" wrote:
> run nbtstat -n on both machines and see what you get.
> I know that in NetBIOS you could have two computers with the same name
> because when the computer is registered its given an ID that is unique and
> also a group id that is unique.
>
> As long as both MAC Addresses are unique, and the IP address of each machine
> is also unique they can live in the same network.
>
> "Goatman" <Goatman@discussions.microsoft.com> wrote in message
> news:54A59742-95D9-40E3-B73A-7C38B0AB35AE@microsoft.com...
> > We've run into something lately that I didn't think was possible.
> >
> > We're running a Win2K AD and things are largely OK but recently we've run
> > into the situation a few times where somebody accidently tries to rename a
> > computer to a name of a computer account that already exists or join a
> > computer to the domain with a name that matches an account that is
> > likewise
> > already in use. There is no warning during the operation, it's just
> > allowed
> > to proceed. As expected we then see Netlogon errors on the machines that
> > are
> > already on the domain with the same name.
> >
> > There is no OS commonality that I can see. I've seen a Win2K3 server
> > knock
> > off another Win2K3 server, a WinXP Pro machine take out a Win2K Pro
> > machine
> > and a WinXP Pro machine take out another WinXP Pro machine.
> >
> > It seems that the two computers are now sharing the same account. If I
> > then
> > rename the older computer it will be reflected in AD but it still has the
> > netlogon errors in its system log. The new computer will then start to
> > have
> > Netlogon errors.
> >
> > In the past I've always seen warnings that the name already exists and the
> > operation was disallowed. I'd always thought what I've seen recently was
> > not
> > possible.
> >
> > Any help would be much appreciated.
>
>
>
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