ISA FIREWALL FACT:
Never put an external DNS server address on any of the ISA firewalls NICs.
Never put an external DNS server address on the internal NIC
Never put an external DNS server address on the external NIC
Never put an external DNS server address on the DMZ NIC
Never put an external DNS server address on any ISA firewall NIC.
EOL.
HTH,
Tom
Thomas W Shinder, M.D.
Site: www.isaserver.org
Blog: http://blogs.isaserver.org/shinder/
Book: http://tinyurl.com/3xqb7
MVP — ISA Firewalls