DNS oddity...HELP!

[Mike Towan]

I am in the process of replacing a DC on our domain. It is of dissimilar
hardware and disk configuration, so I demoted the DC to be replaced so that
I could add the new one later to the domain. The DC that was demoted housed
Active Directory Integrated DNS Zones. A total of 3 DC's exist and all have
DNS running on them. When I demoted DC1 and shut down it's DNS services,
external DNS resolution stopped. Looking at that particular machine, it had
a "Cached Lookups" folder in addition to the Forward Lookups and Reverse
Lookups. The other 2 DC's, however, don't have the Cached Lookup folder,
which seems to be causing them to fail external resolution.

Anyone have any idea why the Cached Lookups didn't replicate to the other
DC's, and more importantly, anyone know how I can quickly fix this?

Mike

 

[Steve Duff [MVP]]

Cached lookups are the entries in the local DNS server's cache that
have not yet expired. Each DNS has its own, but it is only shown if
you select View...Advanced. It does not replicate.

If outside resolution is stopped it is likely because the alternate DNSen
do not permit recursive resolution of queries, and/or have no access to
an outside DNS via forwarders or root hints.

Steve Duff, MCSE, MVP
Ergodic Systems, Inc.

 

[Mike Towan]

Thanks Steve... you had it correct, ended up being an ACL entry on the
firewall....

Thanks for the promot answer!

Mike