Update (): To set the channel to monitor you should select it before you enter monitor mode. Retry long limit:7 RTS thr:off Fragment thr:off Wlan0 IEEE 802.11bg Mode:Monitor Frequency:2.462 GHz Tx-Power=20 dBm Now use iwconfig to put the interface into monitor mode, check the interface status and then turn the interface on again: Turn the wireless LAN interface off (on my computer the OS labels the interface wlan0): Right-click on the network icon in Gnome and de-select Enable Networking (i.e.
Either read on or watch the 16 minute video.Ĭapture Wireless LAN Packets with tcpdumpįirst make sure NetworkManager is not automatically connecting or turning interfaces on/off. Update (): Also I have a screencast below showing the steps on a Lenovo laptop. Of course capturing other peoples traffic may be illegal/unethical in some situations don't do it if you are not sure. First using the basic commands of iwconfig and tcpdump, and then the dedicated software Kismet. Here are some instructions for using my Samsung NC10 Ubuntu laptop to capture wireless LAN packets. I suggest reading/trying both iw seems to be more powerful and now works more often for me than iwconfig. Update : The following instructions use iwconfig to enable monitor mode on wireless LAN interfaces in Linux if written instructions for an alternative approach, using iw to enable monitor mode. Nowadays many more cards are supported, but most features of capturing are usually only possible under Unix-like operating systems (its hard/impossible in Windows). Then I used Cisco Aironet 350 PCMCIA cards, RedHat Linux and Ethereal (now called Wireshark).
Then, as it is now, the major difficulty was having drivers for your wireless card that support capturing (i.e. I first tried capturing wireless LAN packets in 2002. By inspecting individual wireless LAN frames, you can see the detailed operation of the wireless LAN medium access control. Capturing Wireless LAN Packets on Ubuntu with tcpdump and KismetĬapturing packets on a wireless LAN interface can be fun because you can see what other nearby laptops and access points are sending.
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