Security established through the use of a set of filter rules that operates by examining IP packets to allow them to pass or not. A router that implements packet filtering is known as a screening router or firewall router.
A method of controlling the flow of IP packets to and from ISA Server. When packet filtering is enabled, all packets are dropped unless explicitly allowed by ISA Server.
Filtering that either allows or blocks packets destined to specific services on or behind the Proxy Server computer.