This is one of a series of 9 packets corresponding to the setup and clear-down of a TCP connection. In this case the conenction was made to the telent (terminal) port of the remote computer. The computer accepts the connection and produces a login prompt to the client. Instead of proceeding to login to the server, the client then decides to terminate the connection.
This packet carries an acknwoledgement to received data aby the server nd a small volume of data from the higher layer protocols at the server destined for the client. Note the slightly larger size of the Ethernet frame.
0: 0800 2086 354b 00e0 f726 3fe9 0800 4500 .. .5K..÷&?...E.
16: 0037 aaff 0000 fc06 3a45 8b85 e902 8b85 .7....ü.:E......
32: d96e 0017 9005 9431 1028 7214 f131 5018 .n.....1.(r..1P.
48: 2238 c10c 0000 fffd 18ff fd1f fffd 23ff "8............#.
64: fd27 fffd 24 .'..$
ETHER: ----- Ether Header ----- ETHER: ETHER: Packet 10 arrived at 17:37:32.18 ETHER: Packet size = 69 bytes ETHER: Destination = 8:0:20:86:35:4b, Sun ETHER: Source = 0:e0:f7:26:3f:e9, CISCO Router ETHER: Ethertype = 0800 (IP) ETHER: IP: ----- IP Header ----- IP: IP: Version = 4 IP: Header length = 20 bytes IP: Type of service = 0x00 (normal) IP: Total length = 55 bytes IP: Identification = 43775 IP: Flags = 0x0 IP: .0.. .... = may fragment IP: ..0. .... = last fragment IP: Fragment offset = 0 bytes IP: Time to live = 252 seconds/hops IP: Protocol = 6 (TCP) IP: Header checksum = 3a45 IP: Source address = 139.133.233.2, server.abdn.ac.uk IP: Destination address = 139.133.217.110, client IP: No options IP: TCP: ----- TCP Header ----- TCP: TCP: Source port = 23 TCP: Destination port = 36869 TCP: Sequence number = 2486243368 TCP: Acknowledgement number = 1913975089 TCP: Data offset = 20 bytes TCP: Flags = 0x18 TCP: ..0. .... = No urgent pointer TCP: ...1 .... = Acknowledgement TCP: .... 1... = Push TCP: .... .0.. = No reset TCP: .... ..0. = No Syn TCP: .... ...0 = No Fin TCP: Window = 8760 TCP: Checksum = 0xc10c TCP: Urgent pointer = 0 TCP: No options TCP: TELNET: ----- TELNET: ----- TELNET: Data
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