Configure DNS to access internal Web Server
 

I have a DNS server running on linux. It has a 2 NIC (private and public IP).

I have a Web Server also running on Apache (separate machine) which has 2 NICS also (private and public IP).

Whenever we browse our website www.abc.com inside our LAN, the access is very slow, it looks like it still going outside our LAN then going back again just to access our web server. What I want is whenever an internal user is accessing our website, it will just access directly our internal web server and would no longer go outside the LAN.

How do I configure the DNS?