Window Control of TCP Tahoe (Review)

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Presentation transcript:

Variety of TCP2－ Reno Internet Engineering

Window Control of TCP Tahoe (Review) Window Size Maximum Window Size Packet loss Packet loss Packet loss ssthresh (slow start threshold) Times Retransmission Retransmission

TCP Reno : Fast Recovery Problem of Tahoe: Window size fall extremely when packet loss (Window size fall into 1) Determine packet loss by duplicate ACKs: Replied ACKs are able to arrive  traffic congestion isn’t serious Determine packet loss by time out Replied ACKs are unable to arrive  traffic congestion is serious Decrease Window size by a half  Congestion Avoidance phase fast recovery Window size is decreased to 1Slow start phase (Similar to Tahoe)

Window Size of Tahoe and Reno Determine packet loss by duplicate ACKs: Tahoe Window Size 1 Reno Window Size divided by 2 Determine packet loss by time out: Tahoe Window Size 1 Reno Reno Reno Tahoe Tahoe

TCP Window Control Summarize (Reno) Window Size Maximum Window Size Packet loss Packet loss Packet loss ssthresh (slow start threshold) Time Retransmission Retransmission

Inefficient case of TCP Reno WS: Window Size WS=8 WS=4 WS=5 Retransmission 1 18 Sender 1 2 3 4 5 6 7 8 1 9 10 11 11 12 13 14 15 16 17 19 Data Packet 1 is dropped ACK Receiver 9 10 11 12 13 14 15 16 17 18 19 21 Next is 1 Retransmission 1 Retransmission 3 Sender 1 2 3 4 5 6 7 8 1 9 10 Time out 3 Data Packet 1, 3, 4 are dropped ACK Receiver 10 Next is 1 Next is 3 Lack of duplicate ACKs number  Time out  Retransmission

Wireless (Including satellite) Variety of TCP Trade-off the reliability and efficiency, which is efficiently retransmission? Which is the best algorithm to define the window control according to network state What is the approach to solve problem for each typical network Wired Wireless (Including satellite) Ad Hoc TCP Tahoe TCP Reno TCP Newreno TCP SACK TCP Vegas ECN HighSpeed TCP FAST TCP Hamilton-TCP Scalable TCP BIC-TCP CUBIC-TCP TCP Aflica MulTCP Adaptive-TCP LTCP Hybla TCP-Peach TCP-Westwood Freeze-TCP ILC-TCP JTCP TCP Veno TCP-Casablanca TCP-DCR TCP-Jersey TCP-Probing TCP-Santa Cruz Delayed Duplicate ACK I-TCP M-TCP METP Snoop ELN EBSN BA-TCP Ad hoc TCP DelAck ELFN TCP-ADA TCP-DOOR TCP-Feedback TCP-Bus Fixed RTO Split TCP DDA

Experiment 8 4 FTP/TCP 2 3 1 5 25Mbps 5ms 25Mbps 5ms FTP Download 4 FTP/TCP 25Mbps 5ms 25Mbps 5ms 2 3 Bandwidth: Bw Delay: d 1 5 FTP Download TCP Agent TCPSink Agent Network Router Network