Vista DDNS issue

I don't know if this will repro on other systems. Here's what I saw:

Vista Business Edition is a member of a small AD (DC's are W2003 R2).
Vista's networking setup for the (hardwired) NIC; DHCP, all defaults. The
DHCP servers only have three options set for the scope: 003 router (the
gateway), 006 DNS servers (2, both AD DCs), and 015 DNS domain name (the AD
domain name). At an earlier date, the system had a DHCP address of 10.x.x.59;
later it ended up with 10.x.x.57 address. There was no DHCP reservation; both
are dynamic addresses from the pool.

The problem: even though an IPCONFIG /ALL would show only the 10.x.x.57 IP,
I'd do an NSLOOKUP on the system's name; it would return both the .57 and .59
addresses and if a roundrobin setup. If I were to go into DNS server and
manually delete either the .59 or BOTH the .57 and .59 addresses, they would
come back if I ran IPCONFIG /REGISTERDNS on the Vista client. DHCP would
still have no lease or registration for the .59 address. Essentially the .59
address was 'phantom' existing only as a DDNS registration.

What finally solved this, for me:

1) wmic nicconfig where ipenabled=true get settingid, Ipaddress
(to list the current ip address and GUID for the NIC)

2) navigate to the following key in regedit
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\Tcpip\Parameters\DNSRegisteredAdapters

3) Remove all GUID's not listed in the revious WMIC output (step 1).

Viola! Vista no longer registers a 'phantom' IP in DDNS. I do not know if
the failure to delete the DNSRegisteredAdapter key when the old DHCP address
stopped bing used is a BUG, or a FEATURE, or just an odd and random
occurrence for my system, but I thought I'd report this anyway.

Cheers,

-quux




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