Access control for networks
作者： Steve Truong , Serene Fan
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摘要: An access control system (a firewall) controls traffic to and from a local network. The is implemented on dedicated network device such as router positioned between an external network, usually the Internet, or one more networks. In this procedure, items are dynamically generated removed based upon context of application conversation. Specifically, allocates channels through firewall its knowledge type applications protocol (context) employed in conversation involving node Further, may selectively examine packet payloads determine when new about be opened. example, employs different rules for handling SMTP (e-mail using single channel having well-known port number) sessions, FTP sessions (file transfer well known number data arbitrary numbers), H.323 (video conferencing multiple channels, which use numbers) sessions.
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