Windows Clients Dynamic Update

[jules]

Hi

I'm not sure if this is the right group to post to.  However, I hope
some of the subscribers to the list have had dealings with Windows
clients dynamic updates.

Our primary DNS server is receiving dynamic update requests from a bunch
of Windows Server 2000 clients behind a company firewall (which I don't
manage or control).  The primary DNS server does not service any of
these clients and is a separate internet only service - it does not use
dynamic updates.  The general question - and what I'm confused about -
is WHY these clients are attempting to contact a server that they
shouldn't even know about.  Any ideas?

>From the log....

        Feb 20 17:36:15 ns named[418]: denied update from [195.171.200.22].8062 for "barnet.gov.uk" IN
        Feb 20 17:46:20 ns named[418]: denied update from [195.171.200.22].8079 for "barnet.gov.uk" IN
        Feb 20 17:50:44 ns named[418]: denied update from [195.171.200.235].29001 for "barnet.gov.uk" IN
        Feb 20 17:51:12 ns named[418]: denied update from [195.171.200.21].3731 for "barnet.gov.uk" IN


Many thanks

Jules