Purpose of CDP mode in the Packet Generator Tool

The purpose of this tool is to give you a way to craft a CDP (Cisco® Discovery Protocol) packet or set of CDP packets to send to a target, then observe the target's response with a packet capturing tool like Packet Capture or view the results of those packets in a switch. 

About crafting and sending CDP packets using the Packet Generator

The Packet Generator tool CDP mode that allows you to create and send one or more CDP packets to a target. You have full control over the fields within the CDP packet. This protocol is use by Cisco and others to communicate interconnection and capability information between switches and routers.


Scripted packet transmission can be used to send multiple different CDP packets.


Related Tool Links

Packet Generator

Packet Generator Screenshot

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Important Notes about the Packet Generator
  • This tool uses WinPcap to send packets. The network interface you use to send packets must be compatible with WinPcap. Best results are usually obtained from a wired ethernet interface or a 802.11 wireless interface.
  • This tool does not send packets at a rate necessary to stress or otherwise saturate an interface. It is not a high speed Traffic Generator and it does not respond to packets coming back. Please consider the Packet Flooder Tool.

Packet Generator Tool Capabilities - UDP Mode


  • Sends CDP Packets to the network mac address 01-00-0c-cc-cc-cc.
  • Full header control for the CDP packet.You can specify most parameters in the header such as source MAC address, checksum, TTL, Device ID Field, Software Version Field, Platform Field, Port ID Field, IPv4 Address of the purported device. The Capabilities Bits are also full selectable.
  • Scripting. Simple scripting is provided so that you can send different types packets. Scripted packet transmission can be used to send packets with parameters changing according to your script.

CDP Send Mode

Packet Generator CDP Packet Definition Screenshot

Capture of what was sent

CDP Packet Generator Screenshot

A video of the Packet Generator tool sending CDP Packets

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This tool uses WinPcap to send specialized packets.