How Packet Filtering Works

• Determine packet characteristics
  • address
  • protocol
  • port
• Associate with a network interface (in/outbound)
• Associate with other packets
  • reply
  • fragmentation
  • duplication
  • count
• Action:
  • Send
  • Drop
  • Reject (return an error)
  • Log
  • Raise an alarm

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 Last change: Monday, June 21, 2004 3:47 pm
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