Question : Internet DNS in Domain

I currently have a T1 connection and a MS Server 2003 domain.  The DNS or Active Directory server has DNS for itselt primary, then 8.8.8.8 (google dns) as secondary.  The DHCP scope has the domain controller for primary DNS and a backup domain controller for secondary DNS.

We are sparatically having trouble browsing to a few sites.  It's odd because one day the site will work, the next it won't.  Or a few hours passes and it works again.  Sites with trouble have included: southwest.com, grainger.com (major tool/part supply site), facebook.com.  People will browse from their cell phones and the sites will come up with no problem.  These major sites can't be going down everytime we have a problem.  The browser will bring you up to a failed page

What might cause this DNS issue?  Any advice on how to correct the problem or point in the right direction for where the problem is?  Thanks.

Answer : Internet DNS in Domain

The primary/secondary server only controls what servers the DC will query when it needs to resolve a name.

If you're wanting it to be able to resolve internet names on behalf of client DNS requests you need to set up a forwarder within the DNS configuration of the domain controllers.
(Set the forwarder for "all other DNS domains" to google's servers)