Issue:
All addresses in the local domain (DNS suffix) fail. Look-ups across the Internet work okay after a very brief pause.
NSLookup defaults to internal DNS server. Look-ups work just fine, but pinging or opening in browsers don't work.
Solution:
As nslookup utility shows that internal DNS is functioning fine. In addition, the gateway is fine as seems the network.
It's only if you set up your switch to sniff packets on the Windows PCs do you see that all requests locally are going out the IP6 setup instead of the IP4 in the network adapter.
(The DHCP / local DNS server does also have IP6 running, but we don't really use it.) The solution is simply to uncheck the IP6 protocol and leave the IP4 one running.
(Macs, Linux (Ubuntu), and XP don't seem to have this problem when if IP6 is enabled, which they still have enabled.)
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