Active directory DNS setup for an intranet web site

HOW DO WE HAVE TO SETUP OUR DNS SERVER TO ACCESS OUR INTRANET WITHOUT USING AN HOST FILE.

I have a domain with 3 sites, and 4 DCs. 2 DCs in the main site and 1 DC in each remote site.
DNS is "public.world.org".
 I have 2 DNS server (DCs) with static IP.

We have an intranet server in the main office.
"intranet.local"

We are on a LAN and we don't use an ISP.

I created 2 forward lookup zones and 1 reverse lookup zone

1. public.world.org for our domain
      NS record for DC servers and web server
      Host (A) for each local clients
2. intranet.local for the webserver
     NS record for DC servers and web server
     1 Host (A)  pointing to the web server IP (same as parent)
     1 Host (A)  pointing to the web server IP  (named *)
3. reverse zone
     subnet
Some of our workstations don't connect to the intranet.
They have to Ipconfig /flushDNS and ipconfig /registerDNS
Sometimes they can't connect at all

To resolve the situation we created an host file with the Web Server IP that we dumped on each workstations.

Now we are adding pages to our intranet and we have to update the host file on each workstation to let them access the different submenu on our intranet

So, my question is HOW DO WE HAVE TO SETUP OUR DNS SERVER TO ACCESS OUR INTRANET WITHOUT USING AN HOST FILE.
icaraincAsked:
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smeekConnect With a Mentor Commented:
Are each of your sites and PCs configured so DNS resolution points back to main site DNS server.  Name resolution has to work at each site but must also query main office DNS server.  I am assuming all sites are members of same domain and resolve to main site using VPN or direct WAN connection.  Use command line tool NSLOOKUP to see which servers are queried and responding.  Here is a guide.
http://www.windowsnetworking.com/articles_tutorials/Using-NSLOOKUP-DNS-Server-diagnosis.html

Also, are all sites on different private IP ranges like.
Main        192.168.2.x/24
Branch1  192.168.3.x/24
Branch2  192.168.4.x/24

I am not sure I understand your naming.  Are sites supposed to connect to server over Internet by pointing browser to public.world.org or do they connect over private side at intranet.domain.local?

Steve
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ryansotoCommented:
On your DNS server you need to create a new zone with the sam ename you're trying to connect to

I had the same question but in reference to OWA and terminal server but it applies the same to your situation

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/Q_23048333.html
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