bind9 hang

[Mark_Andrews at isc.org]

> 
> bind9 seems to hang after a prolong/frequent network outage.
> you can still use it to resolve for the zone that it authorizes,
> but NOT for the names for elsewhere.
> today, my named (bind-9.2.1rc1, solaris 7, chrooted) hang after
> one hour Internet uplink down. When the link is back online, I
> can "nslookup" for local names, but a query for "www.google.com"
> or "www.yahoo.com" just hang. I did a truss of the "named" process
> to see what it is doing. not much info (see attached). maybe
> it got to an infinite loop?
> 
> btw, I've seen similiar hang problem with bind9 that comes with
> redhat linux 7.2. I run it as a cache only nameserver on the local
> host (laptop). After a long power save mode, named will usually
> quit responding. I have to restart named everything I am back
> from a standby power-save mode.
> 
> Any thoughts?
> Thanks!
> Frank

	I would be looking at network congestion.  The truss shows
	named making 558 queries (fd=7) and only receiving 29 answers.

	Mark
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org