|
 Free to try
 Buy Now
Decoding Packets
Javvin Packet Analyzer analyzes and decodes packets and displays detailed packet information in the Packets tab view and its sub-views. Packet decode information lets you look through the packets themselves, which is very useful in troubleshooting your network to track down security vulnerability or learning more knowledge about protocols and network services.
The following sections introduce the Javvin Packet Analyzer decoders, describe how to read a packet's information and decode.
Packet decoders
The packet decoders are the essential engines to decode packets. All available decoders are enabled by default, but you can close those you don't need to increase the program performance.
To open the Options - Decoder page, select Options... from the Tools menu and then press the Decoder tab. All decoders are listed by protocol and marked with a tick indicating they are enabled, use the check box before every decoder to disable it.
Note: The decoders are applicable to global packet decoding. When you disable a decoder in the Decoders dialog, Javvin Packet Analyzer will continue not to use that decoder to decode the packets of the same type until you enable it again.
Decode view
To view the decode information of the current packet, press the Show Decode icon  in the toolbar to open the decode sub-view, or double click on the packet to open the Packet Decode window.
The packet decode view presents information based on the protocol used in packet transmission, click on the - minus or + plus signs in the margin to collapse or expand the view of any header section.
The following decode information is added by Javvin Packet Analyzer.
Name |
Description |
Packet Number |
The packet number which is set automatically by Javvin Packet Analyzer. |
Packet Length |
The bytes size of this packet. |
Capture Length |
The bytes size captured by Javvin Packet Analyzer. |
Timestamp |
The actual time when the packet was captured. |
The data in the decode view can be copied and pasted to the clipboard.
HEX and ASCII view
Push the Show Hex  icon in the Packets view or Packet Decode window to view the actual packet contents in Hex on the left and ASCII on the right (by default), or change ASCII decode to EBCDIC by choosing Show EBCDIC from the context menu with a right click on the Hex view.
The Hex view is graphically linked with the decode view, when you select a portion of packet contents in the decode view, Javvin Packet Analyzer highlights the selected portion and the corresponding Hex data and ASCII/EBCDIC data in the Hex view.
|
