Forwarding Requests to an External Name Server
Merton Campbell Crockett
m.c.crockett at adelphia.net
Tue Jun 6 02:52:28 UTC 2006
I have several internal name servers are that still running BIND
8.3.7-REL running under BSD/OS 4.3.1. Normally, this version of BIND
behaves the same as BIND 9.3.x that is running on various Linux
systems and appears to be a little more robust.
The BIND 8.3.7-REL systems are internal master name servers that
function as name servers of last resort for all internal name
servers. If they cannot answer the DNS query locally, they are
configured to forward all DNS queries to an external name server.
The global section of named.conf has both forwarders {...}; and
forward only; statements.
Over the weekend, one of the internal servers began forwarding
queries for an internal-only zone to the external name server
although it had a valid copy of the internal zone. What can cause
this to happen?
To clear the problem, I had to stop the name server and then restart
it. This is unusual as we, typically, only stop and restart BIND is
when we change versions of BIND or apply a patch to the operating
system.
Merton Campbell Crockett
m.c.crockett at adelphia.net
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