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MIDCOM Protocol Semantics 56 th IETF

MIDCOM Protocol Semantics 56 th IETF. Martin Stiemerling, Jürgen Quittek, Tom Taylor {stiemerling|quittek}@ccrle.nec.de taylor@nortelnetwork.com. 20030318. Changes in –01 Draft. Address tuple section Moved from PER/PRR sections into new section Structured wildcarding text

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MIDCOM Protocol Semantics 56 th IETF

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  1. MIDCOM Protocol Semantics56th IETF Martin Stiemerling, Jürgen Quittek, Tom Taylor {stiemerling|quittek}@ccrle.nec.de taylor@nortelnetwork.com 20030318

  2. 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

  3. 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)

  4. 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

  5. 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?

  6. 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.

  7. INVITE(listen on port X*) INVITE(listen on Port x) 200 OK (listen on Port E) 200 OK (listen on Port E) User I Internal SIP Telephone User E External SIP Telephone Private Network NAPT Reserve External Address and Port X Enable All OK, NAT mapped address and port X* Enabling SIP Calls orWhy do we need PRR? I wanna call User E

  8. Thank you!

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