OK, I need your knowledge once again.

I've just set up a BIND 9.1.3 server as our primary NS, and it's working.  (Our NT box that was doing that stopped working.  The rest of the box is OK, but DNS service will say it's started but never respond to queries.)  

Well, when I say it's working, I'm only slightly lying.  It's a master for 3 zones that we have, and acts as a cacheing NS for the rest.  (I've been all through the crisket book.)  Every so often... anywhere from 4 to 48 to sometimes more hours it will give host unknown answers to all queries that it is not a master for.  ie. it'll get voyager.sumitomoelectric.com which it is authoratative for, but www.google.com will return an unknown host.  restarting named will correct this problem.

What do I need to look for in the logs?  I've currently got it on logging level 1 with querylog.  Or, if you have an idea, what do I do to fix it.

Things I think it might be from my research in the NT problems... (the NT server had this problem as well... though it would only lose the ability to look up names that weren't already in the cache.)  does the phrase "cache-poisoning" mean anything?  and if so, how do I fix it?  

As usual, I'm tearing my hair out, and would love to hear that this is a really easy problem to fix.

Thanks for all your help.

CJK



