建议看英文版本,中文这翻译 真没法看。
Introduction
This document describes how to configure the Cisco Security Appliances PIX/ASA using Modular Policy Framework (MPF) in order to block the Peer-to-Peer (P2P) and Instant Messaging (IM), such as MSN Messenger and Yahoo Messenger, traffic from the inside network to the Internet. Also, this document provides information on how to configure the PIX/ASA in order to allow the two hosts to use IM applications while the rest of the hosts remain blocked.
Note: The ASA can block P2P type applications only if P2P traffic is being tunneled through HTTP. Also, ASA can drop P2P traffic if it is tunneled through HTTP.