DCCP User Guide

1
DCCP User Guide

• draft-ietf-dccp-user-guide-01.txt
• Tom Phelan Sonus Networks
• tphelan_at_sonusnet.com
• 4-March-2004
• http//www.phelan-4.com/dccp/DCCP-UG-Seoul.ppt

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