MIDCOM Protocol Semantics 56th IETF

1
MIDCOM Protocol Semantics56th IETF

• Martin Stiemerling, Jürgen Quittek, Tom Taylor
• stiemerlingquittek_at_ccrle.nec.de
• taylor_at_nortelnetwork.com

20030318
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Changes in 01 Draft

• Address tuple section
• Moved from PER/PRR sections into new section
• Structured wildcarding text
• IP addresses and port numbers
• Currently no IP wildcarding supported
• Adapted example section
• Changed group transactions
• Now imlplicit handling
• See next slide
• Conformance statements

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Group Transactions

• Groups are created implicit by PER/PRR
• No explicit group lifetime anymore
• Group is deleted when last member Policy Rule is
  deleted
• Removed transactions
• Group Establishment (GE)
• Asynchronous Group Deletetion (AGD)

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Conformance Statements

• Session Control Transactions All Mandatory
• Session Establishment (SE) mandatory
• Session Termination (ST) mandatory
• Asynchronous Session Termination (AST) mandatory
• Policy Rule Group Transactions All Optional
• Group Lifetime Change (GLC) optional
• Group List (GL) optional
• Group Status (GS) optional
• Policy Rule Transactions
• Policy Reserve Rule (PRR)
  mandatory
• Policy Enable Rule (PER)
  mandatory
• Policy Rule Lifetime Change (RLC) mandatory
• Policy Rule Status (PRS)
  optional
• Asynchronous Policy Rule Deletion (ARD)
  mandatory

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Open Issues(1)

• Is IP wildcarding required?
• What would be application scenarios for IP
  wildcarding?
• Further elaborate the capability information sent
  from the middlebox to the agent at session setup.
• What further capability information should be
  sent?
• Is there a need to support enabling ICMP, IGMP,
  RSVP, ...?
• Should the middlebox reply with a list of
  supported encryption methods in SE failure reply?

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Open Issues(2)

• Further elaborate section on security
  considerations.
• Shall the agent be able to specify parameters for
  protection against denial of service attacks,
  like
• maximum total number of TCP connection setups
  allowed
• maximum number of TCP connection setups per
  minute
• maximum number of UDP packets per minute
• maximum bit rate
• etc.

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Enabling SIP Calls orWhy do we need PRR?
I wanna call User E
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Thank you!