draft-iab-service-id-considerations

1
draft-iab-service-id-considerations

• M StJohns, G Huston, Eds.

2
Impetus

• Panama blocking of IP Telephony Ports
• Circa Nov 2002
• Both in country and transit
• SPECIFICALLY not mentioned in the ID
• Some ISPs restricting SMTP traffic
• Continuing

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Definition

• Service Identifier
• Any of, all of, or combinations of
• IP Version
• ULP Identifier (E.g. TCP or UDP)
• Source and destination address
• Source and destination ports
• Application specific service identifiers

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Intent

• Identify questionable third-party or intermediate
  system practices
• Note ease of bypass of intermediate system
  filtering
• Note possible secondary impacts from intermediate
  system actions
• May diminish usefulness of well-known identifiers
  as default technique
• Causing replacement by more complex dynamic
  negotiation
• May reduce current abilities to characterize
  traffic by flow inspection

5
Feedback

• Two emails commenting on the ID
• Points
• What exactly are you trying to achieve?
• Didnt you just mean port numbers?
• What do firewalls have to do with this?