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TURN- Lite : A Lightweight TURN Architecture and Specification ( draft-wang-tram-turnlite-02 )

TURN- Lite : A Lightweight TURN Architecture and Specification ( draft-wang-tram-turnlite-02 ). Aijun Wang (China Telecom) Bing Liu (Speaker) (Huawei) IETF 92@Dallas, March 25 2015. Why we proposed a new architecture. We’ve been exploring:

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TURN- Lite : A Lightweight TURN Architecture and Specification ( draft-wang-tram-turnlite-02 )

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  1. TURN-Lite: A Lightweight TURN Architecture and Specification(draft-wang-tram-turnlite-02) Aijun Wang (China Telecom) Bing Liu (Speaker) (Huawei) IETF 92@Dallas, March 25 2015

  2. Why we proposed a new architecture • We’ve been exploring: • Service Providers might provide TURN relay service to their customers (mostly ICPs, Application Providers) • Utilize the already deployed CGN/CDN devices as TURN servers • But we found it was complex • Every CGN (TURN server) needs reserve and plan Address/Port, which is a big burden for SPs, especially there are many CGN devices deployed in a distributed manner • Signaling is complex: ICE-based interaction; different processing for UDP, TCP and v4-v6 communication • So many CGN devices can hardly directly open to customers (interface issue)

  3. TURN-Lite Architecture (Updated since last meeting) • Architecture • RS—Relay Selection • CGN—Data Relay • Client---Connection Initial • Reduce the complexity • each relay needs only one transport address/port • signaling procedures are significantly simplified • a single RS interface is much easier for opening to customers • So that • SPs can easily integrate the relay functions into distributed devices such as CGNs. • SPs can easily provides data relay service to ICP/App Provider via RESTful Interfaces App Provider 1 App Provider 1 App Provider 1 SP’s Domain RS(Relay Selector) CGN-1(TURN-Lite Server1) CGN-2(TURN-Lite Server1) CGN-3(TURN-Lite Server1) NAT-1 NAT-2 Host-1(V4/v6)TURN-Lite Client Host-1(V4/v6)TURN-Lite Client

  4. Communication Procedures Clients register to their App server, and gets the RS address, get their reflective addresses to RS(REFLX_RS) and report them to App server App server sends REFLX_RS pair to RS, let RS select one optimal relay device to relay data. Clients get their reflective addresses to Relay (REFLX_Relay) and report them to RS, RS form COUPLE packet and send it to the selected CGN devices. Clients send TCP/UDP packet via the selected CGN device, CGN device relay the data based on the table built by COUPLE command. App Provider 1 App Provider 1 App Provider 1 ② SP’s Domain ① RS(Relay Selector) ③ CGN-1(TURN-Lite Server1) CGN-2(TURN-Lite Server1) CGN-3(TURN-Lite Server1) ④ NAT-1 NAT-2 Host-1(V4/v6)TURN-Lite Client Host-1(V4/v6)TURN-Lite Client

  5. Relationship with TURN • TURN-Lite is NOT intended to be a full alternative of TURN • We consider it as a complementary solution for SP-Public-Relay-Service (e.g. for network operators or CDN providers .etc)

  6. Next Steps • Feedbacks are welcomed • Especially from ICP perspective • Also from ISP/CDN provider perspective • A useful work? Possibly added to the charter?

  7. Comments?Thank you!wangaj@ctbri.com.cnleo.liubing@huawei.comIETF92@Dallas

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