I TCP 1/2. Internet TA: Connection-oriented (virtual circuit) Connectionless (datagram) (flow control) (congestion control) TCP Connection-oriented
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1 I TCP 1/2 TA: Connection-oriented (virtual circuit) Connectionless (datagram) (flow control) (congestion control) Internet TCP Connection-oriented UDP Connectionless IP +
2 TCP (connection-oriented) (byte stream service) T S I A N TCP being viewed as byte-stream service T S I A N TCP (stream oriented) Virtual circuit (call setup / release) (buffered transfer) (full duplex) piggybacking (ACK: Acknowledgment) Active acknowledgment Duplicate ACK
3 ACK Sender Sent and acknowledged Sent but unacknowledged Nara Institute of Science and Technology User data arrives Outstanding packets Receiver Nara Insti Piggybacking Sender Sent and acknowledged Sent but unacknowledged Nara Institute of Science and Technology User data arrives Outstanding packets Receiver/Sender Nara Insti TCP (IP, port) TCP connection (source IP, source port, destination IP, destination port) (IP, port)
4 TCP IP Header TCP Header TCP segment TCP data 16bit source port 16bit destination port 32bit sequence number 32bit acknowledgment number 4bit hlen reserved flags 16bit window size 16bit TCP checksum 16bit urgent pointer (options) 20 octets (TCP data) 3-way handshake SYN, SYN ACK, ACK URG ACK PSH RST SYN FIN 16bit source port 16bit destination port 32bit sequence number 32bit acknowledgment number 4bit hlen reserved flags 16bit window size 16bit TCP checksum 16bit urgent pointer 20 octets
5 dv# tcpdump tcp and host mint100.aist-nara.ac.jp tcpdump: listening on de0 12:16: dv.aist-nara.ac.jp > mint100.aistnara.ac.jp.telnet: S : (0) win <mss 1460,nop,wscale 1,nop,nop,timestamp > (DF) [tos 0x10] 12:16: mint100.aist-nara.ac.jp.telnet > dv.aistnara.ac.jp.49626: S : (0) ack win <mss 1460> (DF) 12:16: dv.aist-nara.ac.jp > mint100.aistnara.ac.jp.telnet:. ack1 win (DF) [tos 0x10] Sequence number + 1 Ack tcpdump time src.port> dst.portflag [ from:to(nbytes) ack# ] win # opt 12:16: dv.aist-nara.ac.jp > mint100.aistnara.ac.jp.telnet: S : (0) win <mss 1460,nop,wscale 1,nop,nop,timestamp > (DF) [tos 0x10] 12:16: mint100.aist-nara.ac.jp.telnet > dv.aistnara.ac.jp.49626: S : (0) ack win <mss 1460> (DF) 32bit sequence number 32bit acknowledgment number flags dv# tcpdump tcp and host tcpdump: listening on de0 13:50: dv.aist-nara.ac.jp > telnet: S : (0) win <mss 1460,nop,wscale 1,nop,nop,timestamp > (DF) [tos 0x10] 13:51: dv.aist-nara.ac.jp > telnet: S : (0) win <mss 1460,nop,wscale 1,nop,nop,timestamp > (DF) [tos 0x10] 13:51: dv.aist-nara.ac.jp > telnet: S : (0) win <mss 1460,nop,wscale 1,nop,nop,timestamp > (DF) [tos 0x10] 13:51: dv.aist-nara.ac.jp > telnet: S : (0) win <mss 1460> (DF) [tos 0x10] 13:51: dv.aist-nara.ac.jp > telnet: S : (0) win <mss 1460> (DF) [tos 0x10] 13:51: dv.aist-nara.ac.jp > telnet: S : (0) win <mss 1460> (DF) [tos 0x10] ^C 39 packets received by filter 0 packets dropped by kernel
6 close FIN Ack of FIN FIN close Ack of FIN 12:16: mint100.aist-nara.ac.jp.telnet > dv.aistnara.ac.jp.49626: FP 713:721(8) ack245 win (DF) [tos 0x10] 12:16: dv.aist-nara.ac.jp > mint100.aistnara.ac.jp.telnet:. ack722 win (DF) [tos 0x10] 12:16: dv.aist-nara.ac.jp > mint100.aistnara.ac.jp.telnet: F 245:245(0) ack 722 win (DF) [tos 0x10] 12:16: mint100.aist-nara.ac.jp.telnet > dv.aistnara.ac.jp.49626:. ack246win (DF) [tos 0x10] ^C 355 packets received by filter 0 packets dropped by kernel RST Abortive release Nonexistent port 13:48: dv.aist-nara.ac.jp > mint100.aist-nara.ac.jp.8080: S : (0) win <mss 1460,nop,wscale 1,nop,nop,timestamp > (DF) [tos 0x10] 13:48: mint100.aist-nara.ac.jp.8080 > dv.aistnara.ac.jp.49635: R 0:0(0) ack win 0
7 TCP 3-way handshake 12:16: dv.aist-nara.ac.jp > mint100.aist-nara.ac.jp.telnet: S : (0) win <mss 1460,nop,wscale 1,nop,nop,timestamp > (DF) [tos 0x10] MSS option Window scale option Timestamp option, etc. 12:16: dv.aist-nara.ac.jp > mint100.aistnara.ac.jp.telnet: P 1:37(36) ack1 win (DF) [tos 0x10] 12:16: mint100.aist-nara.ac.jp.telnet > dv.aistnara.ac.jp.49626: P 1:16(15) ack37 win (DF) [tos 0x10] 12:16: dv.aist-nara.ac.jp > mint100.aistnara.ac.jp.telnet: P 37:40(3) ack16 win (DF) [tos 0x10] 12:16: mint100.aist-nara.ac.jp.telnet > dv.aistnara.ac.jp.49626: P 16:40(24) ack40 win (DF) [tos 0x10] 12:16: dv.aist-nara.ac.jp > mint100.aistnara.ac.jp.telnet: P 40:108(68) ack40 win (DF) [tos 0x10] 12:16: mint100.aist-nara.ac.jp.telnet > dv.aistnara.ac.jp.49626: P 40:64(24) ack108 win (DF) [tos 0x10] Nagle Q. 1byte 20byte+20byte Nagle algorithm ACK RTT LAN RTT WAN
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