1. Tall Stacks Henning Schulzrinne Columbia University

2. ACM Sigcomm – Applications, Technologies, Architectures and Protocols 1980s1990s – we’re losing Political Application Presentation Session Transport Network Link Physical Startup Web TCP IP Optical

3. Grand Challenge: Taller Stacks If we continue, we’ll run start-ups directly on optical No protocols = no measurements, composable OS kernels, protocol verification, no conferences Thus, we need taller stacks Also defeats NATs, firewalls, British customs officers, Moore’s law, …

4. Tall Stacks Contest (aka Multiple Protocol Layer Stacking) Cannot use the same protocol twice (except IP) Bonus points for use of MPLS Evaluation:  = payload / packet length Smallest number wins Hints: base64! OTP coding! RFC 2733!

5. SONET ATM AAL5 IPv4 IPv6 UDP RTP V.21-in-RTP(1 bit per packet!) PPP IPv4 L2TP Ethernet IP TCP SMTP IP-in-SMTP MPLS The margins are too small to contain the whole solution. IP SCTP RTP SONET IETF Pittsburgh