Hi,
How to setup DNS services on FreeBSD4.3?
I need particular steps.
What are they which Updated some files?
thanks a lot.
Or setup only forward DNS service.

Please start here -> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/dns.html

Your message should be posted to DNS forum. It fits better there.

I know my answers aren't so helpful, neither is your question. Don't get me wrong, I am willing to help, but you are asking something that's too broad and too basic, so please get yourself a little familiar with DNS, then come back and show us what you've got.