networking -> some computer can go internet some can't ?

i can't figure out why some of my computer on the network with ad can't go online and surf. i can however see all computer on network. what the cause?
jasonpham80Asked:
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hehewithbracketsConnect With a Mentor Commented:
I'm not sure how you have your DNS configured, but this is how you should set it up.

1.  DNS server should have only 1 DNS entry pointing to itself.
2.  Enable forwarders on your DNS server and enter the ISP's DNS servers here
3.  Internal clients should have the local DNS server assigned as the primary DNS server
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ngravattCommented:
ad = active directory ?

do they have IP address, open a command prompt and type ipconfig.  

Ping the gateway.  Ping cisco.com.  

What are the results?
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jasonpham80Author Commented:
only one server with ad , the rest is client and some of client can't go online.
ping gateway ok
ping cisco.com not ok ( unknow host)
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ngravattCommented:
what do yo get when you open a command prompt and type

ipconfig /all

sounds like your DNS settings are not setup properly.  Go to the connection properties and make sure it is set to automatically obtain IP address and DNS info.

what happens if you open a command prompt and type

nslookup cisco.com

?
let me know
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jasonpham80Author Commented:
i think i know the problem but don't know how to fix it

1) computer can't go online
i ping local dns -> result ok
i ping isp dns -> result not ok


2) computer can go online
i ping local dns -> result ok
i ping isp dns -> result also ok


it look for all three dns i config on network call. 1 local and two isp dns
cant find cisco, non-exist domain.
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jasonpham80Author Commented:
i can't enable forwarder,
it say forwarder are not available because this is the root server
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hehewithbracketsCommented:
You do not want your DNS server to be the root server.

Here are the instructions for doing this as well as an explanation of why you need to do it:

http://www.petri.co.il/no_forwarding_or_root_hints_on_dns_server.htm
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