Cant get to internet DNS issue Upgrading to server 2008 R2 DC

Hello,
    I have an office that is running a server 2003 environment and I wanted to go to 2008. I did all the usual forest upgrades, adprep /forestprep and so on, I ran DC promo on server 2008 and it says it was all successful. I made the new server the operations master and all the other things you do for an upgrade and promo.

Prior to running to demoting the 2003 server I wanted to just power it down. To be sure the environment would run Ok. All seems to be ok except, no internet. Seems to be DNS related.  I can get into firewall form outside and can remote into server form outside so I know ISP is good. Checked firewalls and internal DNS are not point to old DC. But when I power old 2003 DC back on internet is back.

Help
tkthelpdeskAsked:
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Mike RoeCommented:
Are you running DHCP that is giving out old IP address for DNS
tkthelpdeskAuthor Commented:
running DHCP from firewall, but those look right. Even hardcoding static IP and DNS for internal either to the firewall or to the new DC did not work.
achaldaveCommented:
Did you install DNS services on new server?
Check if windows firewall is blocking anything on new server.
Can you see DNS related errors on event logs on new server?
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tkthelpdeskAuthor Commented:
yes put DNS on new DC. I can get everywhere else on network with new server just not out to internet.

I will see what logs have
Mike RoeCommented:
can you ping  by IP address

Try 8.8.4.4 that is google public DNS server
tkthelpdeskAuthor Commented:
Yes I can ping it and 4.2.2.2 and I do not see any firewall errors
tkthelpdeskAuthor Commented:
any more ideas? so to recap, I made two server 2008 R2 domain controllers and still have the one 2003 DC (the original) running. DNS does not work if I turn it off on 2003 server? Not sure why other two new DC not picking it up?
Mike RoeCommented:
I would remove DNS from new machine.  Remove the 2003 server and then add the DNS back to the new server without the 2003 server running.

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tkthelpdeskAuthor Commented:
So if I understand, remove DNS form the Server 2008 DC, then demote the 2003 DC and remove dns and then add back to Server 2008?
Mike RoeCommented:
achaldaveCommented:
Make sure your new servers are allowed to query DNS server outside of your network also try setting forwarding DNS queries to ISPs DNS server
Check this link
http://support.microsoft.com/kb/2508835
tkthelpdeskAuthor Commented:
I ended up doing this.
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