Adding ECN Capability to TCP’s SYN/ACK Packets

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Presentation transcript:

Adding ECN Capability to TCP’s SYN/ACK Packets A. Kuzmanovic, S. Floyd, and K.K. Ramakrishnan draft-kuzmanovic-ecn-syn-00.txt TSVWG November 2005

Purpose: Specifies a modification to RFC 3168 to allow TCP SYN/ACK packets to be ECN-Capable. Based on the SIGCOMM 2005 paper by A. Kuzmanovic. Avoids the retransmit timeout when a SYN/ACK packet is dropped. If the SYN/ACK packet is ECN-marked, the sender of that packet responds by reducing the initial window to one segment, instead of two to four segments.

More: The SYN/ACK packet can be sent as ECN-Capable only in response to an ECN-setup SYN packet. The SYN packet still MUST NOT be sent as ECN-Capable. The benefit of adding ECN-capability to SYN/ACK packets can be high, particularly for small web transfers.

Security Concerns: “Bad” middleboxes that drop ECN-Capable SYN/ACK packets? We don’t know of any. If the first SYN/ACK packet is dropped, the second one should be sent as not ECN-Capable. There is no danger on congestion collapse: Routers are free to drop rather than mark ECN-Capable packets. If the SYN/ACK packet is marked, the sender sends at most one data packet; if that packet is dropped or marked, the sender waits for a retransmit timeout.

Testbed Experiment: From Alexsandar’s SIGCOMM 2005 paper on “The Power of Explicit Congestion Notification”.

Testbed Experiments

ECN and Flash Crowds Reasonable performance despite huge congestion

Details of testbed experiment: 15 Mbps arrival rate, 10 Mbps service rate. Very short transfers.