This is one of a series of 9 packets corresponding to the setup and clear-down of a TCP connection. In this case the connection was made to the telnet (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 only an ACK (acknowledgment) from the serve for data received from the client.
0: 0800 2086 354b 00e0 f726 3fe9 0800 4500 .. .5K..÷&?...E.
16: 0028 aafe 0000 fc06 3a55 8b85 e902 8b85 .(....ü.:U......
32: d96e 0017 9005 9431 1028 7214 f131 5010 .n.....1.(r..1P.
48: 2238 1c64 0000 0000 0010 0000 "8.d........
ETHER: ----- Ether Header ----- ETHER: ETHER: Packet 9 arrived at 17:37:31.08 ETHER: Packet size = 60 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 = 40 bytes IP: Identification = 43774 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 = 3a55 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 = 0x10 TCP: ..0. .... = No urgent pointer TCP: ...1 .... = Acknowledgement TCP: .... 0... = No push TCP: .... .0.. = No reset TCP: .... ..0. = No Syn TCP: .... ...0 = No Fin TCP: Window = 8760 TCP: Checksum = 0x1c64 TCP: Urgent pointer = 0 TCP: No options TCP:
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