1 DCCP User Guide draft-ietf-dccp-user-guide-01.txt Tom Phelan – Sonus Networks

2 User Guide Overview Focus on app strategies for using DCCP, not on DCCP API Intro – candidate apps, choosing a CCID App stories – streaming media and interactive games Stupid DCCP tricks – useful features of DCCP Security Considerations – useful security features

3 User Guide Issues My take on potential controversies in guide: Fast restart Guide assumes 8 packets/RTT after idle This didnt make it into CCID3 rev Training period in strategy 3 Post-dial delay problems? Just doesnt work?

4 User Guide Issues (2) Stream switching Not acceptable to users? Variable rate media 10x frame-to-frame variations just cant be supported Stream padding Dont transmit more than maximum encoding rate When at lower encoding, pad to TFRC rate

5 User Guide Issues (3) TFRC with self-limiting sources Boy, do we need some simulations Restart after idle for games Not going to work? More apps Detail for media and games – do we need more apps?

6 User Guide Issues (4) Stupid DCCP tricks: PMTUD with DCCP-Sync packets App-level partial reliability App-level sequencing with DCCP sequence numbers App-level flow control with Slow Receiver Option Detecting lost data with NDP