router/gateway limit problems

[Chris Ross <cross%distal.com@localhost>]

  I have a netbsd-5 host running as my local router.  i386.  For  
quite a while, during heavy traffic times, I'm seeing the following on  
the console:

Dec 30 00:14:04 router named[19459]: socket: too many open file  
descriptors

  Now, I'm sure there is some configurable parameter to either the  
kernel, or named's environment that could alleviate this problem, but  
I've been unable to figure it out so far.  This router is, as you'd  
guess, running a caching nameserver and is the primary nameserver for  
all connected networks.

  Could anyone advise me?  Thanks.

                   - Chris