Ethernal 1.2

A simple tool for visualizing all incoming and outgoing Ethernet packets

(c) 2005 Jean Bovet


I wanted to learn how to read raw Ethernet packets on Mac OS X. After going through several examples, I ended up writing this little piece of software. It uses the Berkeley Packet Filter device to read all incoming and outgoing Ethernet packets. I have wrapped the whole thing in a Cocoa GUI using the new bindings features of Mac OS 10.3.

  • Reads all incoming/outgoing Ethernet packets
  • Displays the MAC address and IP addresses (resolving them also)
  • Displays the packet content in hexadecimal/ascii
  • Finds any string in packet (using search field and standard Find dialog)
  • Filters packets
  • Dynamic display width
  • Save/load packets to disk
  • Export packets to text-delimited file
Download version 1.2 (05/24/2005)
Binaries and source code for Mac OS X (requires Xcode 1.5). English and Italian (Gabriele Callari). (368 KB)

Make a donation
Developing free software like Ethernal takes time and resources, so I've set up this little donation service for funding this effort. Making a donation is an encouragement for me to continue work on these projects and to increase and improve the free software.
I would like to thank Prof. Cruse for having transmitted his passion of programming the hardware on Linux (CS 635).

Thanks also to Rich Kubota for the example he provided about how to use the BPF.

The following examples/documentations have been used to implement this software:

Comments and suggestions
Send any comments, suggestions or bug reports to jbovet at