Migrating DNS servers, need advice on hardware

John Wobus jw354 at cornell.edu
Fri Sep 25 15:15:27 UTC 2009

>> How can observer the query count? Is there a command or table or
>> something or is it just how many hits the systems gets on port 53
>> identified from some form of logging software?
> BIND logs hit statistics periodically to syslog, and you can use "rndc
> stats" to append statistics immediately to a file.  See the BIND  
> manual
> for details.

Other means:

The BIND manual tells how to turn on bind's query log, which is  
normally turned off for performance/resource reasons.
On a very lightly loaded DNS server, it can be left on, and on a  
medium-loaded server, it may be practical to
turn it on for a short while to collect some usage data.

On a Solaris system, snoop can help (as can tcpdump on other *nix  
systems), e.g. to get a frame of reference
regarding your load, inspect 1000 packets to port 53, measuring how  
many seconds it takes to collect them.

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