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I started out on a mission to block instant messaging- (AIM, Yahoo, MSN) To avoid an endless list of IP's, I was planning on blocking the login servers by DNS name. I soon discovered that our PIX cannot resolve any hostnames. It can ping to the...
I see. So what is the best way to deal with restricting access to DNS names that resolve to multiple and/or dynamic IP's? Are there any alternatives to manually maintaining a host file/access list? Thanks for your help!-P
