External resolve / internal don't

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From: Geraint (anonymous_at_discussions.microsoft.com)
Date: 07/29/04 

Date: Thu, 29 Jul 2004 13:26:37 -0700

We have a domain running over a WAN with each subnet
containing it's own DC and DNS server. All on Win 2k SP3.
Just recently one of the subnets is experiencing
following problem:
Clients can resolve external names and FQDN for internal
computers but not the short internal names, (they used to
resolve OK).
The DNS server itself can resolve short internal names.

Nothing has changed on this server that I know of and no
errors are reported in the event logs. I have re-
installed DNS on this server but still the same.
The server is multi-homed with one card to the DSL router
and one to internal LAN. Both are set up as per MS
recommendations for multi-homed.
Other info:
DHCP is set up for clients, supplying internal and
external DNS servers. DHCP working OK (ipconfig/all OK).
All required records are present in DNS forward/reverse
lookup zones.
DNS has forwarding set up for 2 external DNS's.
DNS listening on both cards (I know not recommended but
we have this set on all our DNS's as they don't work
unless we do!).

It looks like DNS is just not reading the records in the
forward lookup zone (out of date/not valid???).

Any ideas.

Geraint

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