We are switching to new T1 provider. We were testing the new T1 by changing the F/W WAN IP. All of the Windows XP/Vista and Windows 2003 32 bit machines are able to ping the new gateway address, except Windows 2008 and Win2K3 "R2" 64Bit machines. Since Win2K8 is also a DNS server, it brings the entire network down when we connect it to the new T1. Windows clients can't connect to Internet with internal DNS address(es), but when changed to public DNS addresses, they do...
All these machines are on the same IP subnet, yet only these two "R2" and 64Bit machines can't ping the new Internet Gateway address. It can however ping IP on the LAN side of the F/W, but not beyond that.
Am I missing steps here? Since this is urgent I need some expert help desperately!!!