Caching-only Name server does Zone Updates

Barry Margolin barmar at
Tue Feb 3 06:05:06 UTC 2009

In article <gm8m0j$1u13$1 at>, "Ashish" <ashish.rao at> 

> Hello All,
> Thank you for your replies.
> Our configuration file is fairly simple (I have changed the domain name for
> security). 
> domain                                         
> cache           .                            /etc/dnscache  
> We use BIND 4.

BIND 4 is at least 15 years out of date, why are you still using it?  
You're not likely to get any sympathy here.

> Actually our DNS was doing lot of CPU utilization and when we
> started it in Debug mode we found that there was a reverse lookup for some
> IP address which was in the dnscache file. (dnscache is the root hint file)

The only things that should be in the dnscache file are NS and A records 
for the root servers.  I have no idea if it uses any of the other 

Barry Margolin, barmar at
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***

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