Create packet

There are two ways to create a packet - Add and Insert. The difference between these two ways is the new added packet's position in the Packet List. The new packet will be listed as the last packet in the list if add a packet, while the insert means the new packet will be listed after the current packet.

Click the add or insert button to open a Add Packet dialog.

• Select Template
  To create a packet, you need to specify the packet type by selecting the name from the Select Template combo box first. The templates contain several kinds of common-used packet - Ethernet Packet, ARP Packet, IP Packet, TCP Packet and UDP Packet.
   
• Delta Time
  Then defines the delta time for the new packet. Delta time means the length of time between the new packet and the last packet in the Packet List, 100 millisecond in default. If you are inserting a packet, the delta time means the length of time between the current packet.
  
  Notes: If there are no packets in the Packet List, this feature will not be enabled.

Editor packet

In addition to create packets, Colasoft Packet Builder allows users to edit the decoding information in the two editors -  Decode Editor and Hex Editor. The feature of editing decoding information of packet is unique to Colasoft Packet Builder, as it is not supported by others packet builder program.

• Decode Editor window

Users can edit the packet decoding information by double clicks the decoding item. The corresponding information in the Hex Editor window and Packet List window will change with the modification of the decoding. Check the Checksum button in the toolbar if you want system calculates the packet's checksum automatically.

Except the Delta time, Colasoft Capsa provides the changeable decoding groups are different in every kind of packet.  

Packet type	Applicability
ARP Packet	Ethernet Type II, Address Resolution Protocol
IP Packet	Ethernet Type II, Internet Protocol
TCP Packet	Ethernet Type II, Internet Protocol, Transport Control Protocol
UDP Packet	Ethernet Type II, Internet Protocol, User Datagram Protocol

For a TCP packet, the decoding information grouped in the Ethernet Type II, IP - Internet Protocol and TCP - Transport Control Protocol are all changeable.



Notes: Colasoft Capsa will validate the entries in the editor. It will popup a window to inform you if the entry is incorrect and undo the modification. You may save the incorrect entry with the click the Esc key if you confirm the entries, though.



In addition, users can execute other operations, such as copy all involved items in a tree, expand/collapse content and so on, by right-click and choose the command from the context menu.


 

• Hex Editor window

The Hex editor displays the actual packet contents in raw hexadecimal on the left and its ASCII equivalent on the right. For you convenience, both the Hex and ASCII are changeable. The Hex used for modifying the hexadecimal code while the ASCII used for changing the packet text.