I'm dealing with a particularly stubborn network admin that has both the internal DNS and external DNS in the DHCP Settings for the clients. His stance is that if the internal ones don't work then they can at least get to the internet if they have the external ones also.
I've found some things on technet that explain how clients can cache negative results and also how clients avoid unresponsive DNS servers. However I've been looking for more proof/reasons why you don't want to do this (he doesn't value Microsoft much). This seems such an obvious thing not do do but I'm having trouble finding specific information as to why you don't do it this way. I've found lots of whitepapers and documentation but not with the details specific to this situation. Any help is greatly appreciated.
I've found some things on technet that explain how clients can cache negative results and also how clients avoid unresponsive DNS servers. However I've been looking for more proof/reasons why you don't want to do this (he doesn't value Microsoft much). This seems such an obvious thing not do do but I'm having trouble finding specific information as to why you don't do it this way. I've found lots of whitepapers and documentation but not with the details specific to this situation. Any help is greatly appreciated.