1. TURN extension to convey flow characteristics draft-wing-tsvwg-turn-flowdata-00 July 2014, IETF 90 Meeting Authors: Dan Wing, Tiru Reddy, Brandon Williams, Ram Ravindranath TURN Flowdata 1

2. TURN relays data – Sort of like SOCKS or an application proxy Applications like WebRTC may use TURN – Privacy – NAT/Firewall traversal – Mobility – IPv6/IPv4 interworking – Enterprise auditing / policy control 2 Background TURN Flowdata

3. TURN server could be deployed by a third party provider or application service provider 3 Background TURN Flowdata

4. TURN server and its network are impacted by traffic using the TURN server During high traffic, it is desirable to shed less- important traffic 4 Problem Statement TURN Flowdata

5. DPI by TURN service provider  Encrypted traffic  Cost DSCP  DSCP values not preserved  OS might not allow setting DSCP 5 Existing Solutions TURN Flowdata

6. TURN Flowdata message flow TURN Client Peer 6 TURN Server TURN Flowdata Allocate Request/Response Channel Bind request with FLOWDATA attribute Channel Bind response with FLOWDATA attribute flow is prioritized Channel Data Data

7. Flowdata format Flowdata does not communicate Diffserv code points Flowdata conveys: – Jitter/loss/delay tolerance (high/med/low) PCP Authentication Requirements 7

8. Proposed Solution Define STUN FLOWDATA attribute Client sends requested flow characteristics Server responds with what can be provided PCP Authentication Requirements 8

9. Questions? 9 draft-wing-tsvwg-turn-flowdata-00 TURN Flowdata

10. Backup Slides 10 TURN Flowdata

11. FLOWDATA format: Request uLTRSVD1 Attribute Type (TBD)Length (4) uDTuJTdLTdDTdJT 11 RSVD2 TURN Flowdata Upstream Delay Tolerance Downstream Delay Tolerance 0 = No information available. 1 = very low 2 = low 3 = medium 4 = high

12. FLOWDATA format: Response AuLTRSVD1 Attribute Type (TBD)Length (4) AuDTuAJTAdLTAdDTAdJT 12 RSVD2 TURN Flowdata Accommodated Upstream Delay Tolerance Accommodated Downstream Delay Tolerance 0 = No information available. 1 = very low 2 = low 3 = medium 4 = high