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 sent by the client completes the TCP disconnection and resets the connection. Note that this must be the final packet in the session. Normally a sender expects a FIN (final) disconnection request to be confirmed; however a reset requires no confirmation and aborts the connection immediately. No further data should flow in either direction.
0: 00e0 f726 3fe9 0800 2086 354b 0800 4500 ..÷&?... .5K..E.
16: 0028 08bc 4000 ff06 9997 8b85 d96e 8b85 .(..@........n..
32: e902 9005 0017 7214 f131 0000 0000 5004 ......r..1....P.
48: 2238 c0c9 0000 "8....
64: fd27 fffd 24 .'..$
ETHER: ----- Ether Header ----- ETHER: ETHER: Packet 11 arrived at 17:37:32.18 ETHER: Packet size = 54 bytes ETHER: Destination = 0:e0:f7:26:3f:e9, CISCO Router ETHER: Source = 8:0:20:86:35:4b, Sun ETHER: Ethertype = 0800 (IP) ETHER: IP: ----- IP Header ----- IP: IP: Version = 4 IP: Header length = 20 bytes IP: Type of service = 0x00 IP: xxx. .... = 0 (precedence) IP: ...0 .... = normal delay IP: .... 0... = normal throughput IP: .... .0.. = normal reliability IP: Total length = 40 bytes IP: Identification = 2236 IP: Flags = 0x4 IP: .1.. .... = do not fragment IP: ..0. .... = last fragment IP: Fragment offset = 0 bytes IP: Time to live = 255 seconds/hops IP: Protocol = 6 (TCP) IP: Header checksum = 9997 IP: Source address = 139.133.217.110, client IP: Destination address = 139.133.233.2, server.abdn.ac.uk IP: No options IP: TCP: ----- TCP Header ----- TCP: TCP: Source port = 36869 TCP: Destination port = 23 (TELNET) TCP: Sequence number = 1913975089 TCP: Acknowledgement number = 0 TCP: Data offset = 20 bytes TCP: Flags = 0x04 TCP: ..0. .... = No urgent pointer TCP: ...0 .... = No acknowledgement TCP: .... 0... = No push TCP: .... .1.. = Reset TCP: .... ..0. = No Syn TCP: .... ...0 = No Fin TCP: Window = 8760 TCP: Checksum = 0xc0c9 TCP: Urgent pointer = 0 TCP: No options TCP:
Click here to return to the list of packet decodes