PPT Slide

Notes

Packet Filtering Firewall

• Uses protocol specific criteria at DLC, network,  and transport layers

• Implemented in routers - called screening router  or packet filtering routers

• Filtering parameters:
  • Source and/or destination IP address
  • Source and/or destination TCP/UDP port  address, such as ftp port 21

• Multistage screening - address and protocol

• Works best when rules are simple

Network Management: Principles and Practice

© Mani Subramanian 2000

13-48

Chapter 13

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