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Extra info for Secure PIX Firewall Advanced Student Guide Version 2.1
Sample text
1 Copyright 2002, Cisco Systems, Inc. Stateful Packet Filtering Limits information into a network based not only on destination and source address, but also on packet data content © 2002, Cisco Systems, Inc. 1—3-8 Stateful packet filtering is the method used by the Cisco PIX Firewall. This technology maintains complete session state. Each time a TCP/UDP connection is established for inbound or outbound connections, the information is logged in a stateful session flow table. The stateful session flow table contains the source and destination addresses, port numbers, TCP sequencing information, and additional flags for each TCP/UDP connection associated with that particular session.
Stateful packet filtering—Combines the best of packet filtering and proxy server technologies. 1 Copyright 2002, Cisco Systems, Inc. Packet Filtering Limits information into a network based on destination and source address ACL © 2002, Cisco Systems, Inc. 1—3-6 A firewall can use packet filtering to limit information entering a network, or information moving from one segment of a network to another. Packet filtering uses access control lists (ACLs), which allow a firewall to accept or deny access based on packet types and other variables.
Packet filtering uses access control lists (ACLs), which allow a firewall to accept or deny access based on packet types and other variables. This method is effective when a protected network receives a packet from an unprotected network. Any packet that is sent to the protected network and does not fit the criteria defined by the ACLs is dropped. But there are problems with packet filtering: ■ Arbitrary packets can be sent that fit the ACL criteria and, therefore, pass through the filter. ■ Packets can pass through the filter by being fragmented.
Secure PIX Firewall Advanced Student Guide Version 2.1
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