This is our old Q&A Site. Please post any new questions and answers at

Hi folks;

I bought the AirPcap device and am sniffing away. I am curious about some of the fields in the Radiotap header. Can someone explain the SSI Signal/Noise values in the packet capture. Are those fields/values inserted by AirPcap when upon packet capture ?? or are they already in the received packet ??

I have found surprising little online documentation providing an explanation of the fields.

thanks, walter

asked 13 Mar '12, 11:44

wakelt's gravatar image

accept rate: 0%

To find the online documentation, you need to look at, for example, the defined-fields page at the Radiotap Website.

Those fields are not in the received packets; they are inserted by the hardware and/or driver, as per the "Background" section of the Radiotap home page.

permanent link

answered 13 Mar '12, 19:42

Guy%20Harris's gravatar image

Guy Harris ♦♦
accept rate: 19%

Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here



Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text]( "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:


question asked: 13 Mar '12, 11:44

question was seen: 8,734 times

last updated: 13 Mar '12, 19:42

p​o​w​e​r​e​d by O​S​Q​A