Thanks for that info Tom. It eases my mind to know that I have done nothing wrong! I will install a Caching only DNS Server on my ISA Server as you advise. I will read up more on Caching DNS Servers. I think I understand how it can help with security. First though, I have got to solve my slow downloads problem. Maybe you can help? I am lodging another question titled SLOW DOWNLOADS explaining the problem. Regards, Barry