IP Address as Identity

• IP address can not be used as an identity token

  identifies computer not user
  
  also dynamic assignment (dial-up & LAN-based)

• network address translator

  translate private internal to public external addresses
  
  can translate multiple machines to same IP address

• privacy issue with IPv6 addresses

  fixed MAC address in lower part
  
  now random number supported

• application-level authentication more definite

  but might be encrypted
  

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