TIPS for small ISP DNS

Hello

I have been using my web server for DNS and the transit providers DNS for secondary.
But I see that when there is load on the server, DNS requests take more time that it should.

This DNS will be serving 1000-1500 ADSL and Wireless broadband coustomers.

I need as high performance as possible on this.

So I would like tips on
-Hardware
-Software
-Setup

 

What other services are running on that server? Which one is consuming the most resources (see top)?

 

It`s mostly spamassasin and clam that is putting load on the server.
I use these through ISPConfig.

So I think the best ting would be to use a separate DNS server, as from time to time load would be high om web/mail server. And the DNS response for ADSL customers would be slow.

 

You can try to use spamd and clamd (there are some forum threads about this), this should decrease the load.

That would be the best solution.

 

Thank you Falko.

Any good setup guides for a DNS server for ADSL ISP use?
Superfast for best surfing experience

 

Take a look at the DNS category: http://www.howtoforge.com/howtos/dns