6: TCP (Telnet) Established

This is the third 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 sends data for the telnet connection (not decoded) from the client to the server.


Hexadecimal Dump of the Packet

           0: 00e0 f726 3fe9 0800 2086 354b 0800 4500    ..÷&?... .5K..E.
          16: 0043 08ba 4000 ff06 997e 8b85 d96e 8b85    .C..@....~...n..
          32: e902 9005 0017 7214 f115 9431 1028 5018    ......r....1.(P.
          48: 2238 9d0f 0000 fffd 03ff fb18 fffb 1fff    "8........û..û..
          64: fb20 fffb 21ff fb22 fffb 27ff fd05 fffb    û .û!.û".û'....û
          80: 23                                      #


Decode of the Packet

ETHER:  ----- Ether Header -----
ETHER:
ETHER:  Packet 6 arrived at 17:37:23.95
ETHER:  Packet size = 81 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 (normal)
IP:   Total length = 67 bytes
IP:   Identification = 2234
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 = 997e
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 = 1913975061
TCP:  Acknowledgement number = 2486243368
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 = 0x9d0f
TCP:  Urgent pointer = 0
TCP:  No options
TCP:
TELNET:  ----- TELNET:   -----
TELNET:   Data


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