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

I want to sniff wifi packets with wireshark but monitor mode seems to fail. I'm using backtrack 5 and an alpha AWUS036H wifi usb card, i try to sniff my own box without encryption.

Here is what i'm doing to activate monitor mode :

[email protected]:~# airmon-ng start wlan0

wich seems to be working :

[email protected]:~# iwconfig mon0
mon0 IEEE 802.11bg Mode:Monitor Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on

However when i start capturing on mon0 in wireshark i'm only getting broadcast packets. In capture options the "capture packets in monitor mode" option is grayed out.

I do not understand what's going on. Any Ideas ?

asked 05 Feb '12, 05:16

kyori's gravatar image

kyori
1111
accept rate: 0%

use airodump-ng and look at the tracefile saved from it, if thats working it might be a wireshark issue, if not make sure your wlan0 device is NOT used to connect to a wireless network, which might corrupt your monitor mode settings on mon0

(06 Feb '12, 05:02) Landi

At least with some versions of Linux and some devices and drivers, you can run in monitor mode when connected to a wireless network. Given the wlan0 and mon0, the driver for the adapter is probably a mac80211 driver, so I wouldn't be surprised if it supported running in monitor mode when connected to a wireless network.

(06 Feb '12, 09:06) Guy Harris ♦♦

Right, that should work - I was just suggesting there might be a conflict if the card already seems to be in mon. mode but the issues appear it might be a conflict where normally there shouldn't be one

(07 Feb '12, 00:39) Landi
Be the first one to answer this question!
toggle preview

Follow this question

By Email:

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

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "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:

×134
×31

question asked: 05 Feb '12, 05:16

question was seen: 5,249 times

last updated: 07 Feb '12, 00:39

p​o​w​e​r​e​d by O​S​Q​A