TAILIEUCHUNG - Packet Filtering

A border router configured to pass or reject packets based on information in the header of each individual packet can theoretically be configured to pass/reject based on any field but usually done based on: protocol type IP addres TCP/UDP port Fragment number Source routing information | Packet Filtering CS-480b Dick Steflik Stateless Packet Filters A border router configured to pass or reject packets based on information in the header of each individual packet can theoretically be configured to pass/reject based on any field but usually done based on: protocol type IP address TCP/UDP port Fragment number Source routing information Protocol Filtering Filtering based on the IP protocol field allows rejecting of entire protocol suites UDP TCP ICMP IGMP This is almost too general ex suppose you block UDP then any TCP based application won’t be able to convert host/domain to IP address so it is seldom used. IP Address Filtering Pass/reject packets based on membership in a set of acceptable IP addresses Usually not used to block specific hosts oscar is frequently blocked so corporate users can use AIM same for some disk backup services Usually block source routed packets big security hole (explained later) If a hacker knows an address that the filter will pass they can .

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