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Application Gateways
A Very Brief Introduction


Prof. David Bernstein
James Madison University

Computer Science Department
bernstdh@jmu.edu

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Filters
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  • Traditional:
    • Each datagram is examined in isolation; some are allowed to pass and others aren't
  • Stateful:
    • Track TCP connections and use state information to determine which datagrams can and can't pass
Filters (cont.)
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  • An Observation:
    • Filtering is done based on IP addresses and ports
  • Shortcomings:
    • We sometimes want to restrict access based on identity (e.g., username)
Application Gateways
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  • Defined:
    • An application-specific server through which inbound and outbound data must pass
  • Problems:
    • Reduced performance
    • One gateway per application
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