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With Wireless sniffing it helps to have an idea of what you are really trying to do you are trying to capture the raw wireless frames from over the air, as seen by the wireless sniffing device itself. Checklist for a successful capture. Step 1    Since the sniffing device, client device and AP are all using RF generating radios for transmission or reception, it helps to have your wireless sniffer close to your target device the client machine. This will allow your sniffing device to capture a good approximation of what your client device is hearing over the air. Step 2    Use a separate device to act as your wireless sniffer you cannot take a good wireless sniffer trace if it is running on the device under test the client machine you are trying to get a wireless trace of. Step 3    Understand exactly what 8. Channel and Band your client device is using before setting up your capture. Lock your sniffer to the channel of interest do not use the sniffers scan channels mode  With scan channels, the sniffer will cycle from channel to channel every second or so useful for a site survey or to find rogues, but not when attempting to capture an 8. Also bear in mind that your client device may roam to another AP which is on a different RF channel or Band, so you need to plan accordingly. Typically in the 8. GHz environment, using a three channel sniffer may be required. This involves using 3 Wireless adapters on your sniffing device, with each one set to channel 1, 6 and 1. Using USB wireless adapters works best for this type of setup. Step 4    If you are troubleshooting 5. GHz, then the number of channels will dramatically increase. Since you might not have enough cards to capture all channels, it is a good practice for the test, to operate on not more than 4 channels on your surrounding Access Points. Step 5    If you can reproduce the problem when a client roams from one channel to another, then a 2 channel sniff should suffice. If you have only a single channel sniffer available, then have it sniff the roamed to channel. Step 6    Always NTP sync your sniffers. The packet capture will need to be collated with debug captures, and with other wired andor wireless captures. Having your timestamps even one second off will make the collation much more difficult. Step 7    If you are capturing for a long period of time hours, then configure your sniffer to cut a new capture file every 3. MB or so.   In order to avoid filling up your hard drive, you will want to put an upper limit on the number of files written. Note The Linksys USB6. N does not reliably collect 1. Missing 2. 0 to 3. If necessary the WLC configuration can be changed to only use the slower long guard interval. This should be only a temporary configuration change. The command is config 8. Sniffer Tools. Wireless Sniffing using a Mac with OS X 1. Wireless sniffing on the Mac works well, as Mac OS X has built in tools to capture a wireless trace. However, depending on what versions of OS X you are running, the commands may vary. This document covers OS X 1. Wi Fi diagnostics is the preferred method in the latest macbooks. It is always good to remember that your macbook sniffer needs to be at least as capable as the client you are sniffing sniffing an 8. Mac OS X Wireless Sniffing Toolsairportd 1. Wi Fi Diagnostics 1. Wireshark 1. 0. 6 1. Airtoolairportd. If you are running OS X 1. Snow Leopard or above, then you can easily use the command line utility airportd. Use the following steps Use the command Space bar key combo to bring up the search diaglog box in the upper right top of the screen and type in the word terminal, this will search for the terminal application, select this application to run it. A terminal window will appear. Once you have a terminal window open, you can run the follow command to capture a Wireless sniffer trace on RF channel 1. Some things to note You will be prompted to enter in your account password for verification. You cannot specify the name of the capture file or where you will place the output. You will lose any wireless connectivity to your network while the capture is occurring. If you are using an Air, the wireless adapter is en. Once you are finished with the trace, hit Cntl C to stop the trace and the utility will display the name and location of the capture file. The file format is your standard wireshark PCAP file that can be read on the MAC or Windows via Wireshark. The airport utility is is not a sniffer program however, it can provide interesting information about the wireless LAN. Also, it has the ability to set the default wireless channel which is crucial for sniffer programs tcpdump, Wireshark that are themselves unable to set the channel. Note because the path to the airport utility is so ugly, it may be a good idea to set a symbolic link to it from a directory in the path, e. SystemLibraryPrivate. FrameworksApple. VersionsCurrentResourcesairport usrsbinairportset the wireless channel sudo SystemLibraryPrivate. FrameworksApple. VersionsCurrentResourcesairport channel4. SSIDsBSSIDs seen sudo SystemLibraryPrivate. FrameworksApple. VersionsCurrentResourcesairport s              SSID      BSSID                  RSSI CHANNEL HT CC  SECURITY authunicastgroup               Test     0. Y       WPAPSKTKIPTKIP WPA2PSKAESTKIP               Test. N       WPAPSKTKIPTKIP               Guest  0. Y       WPAPSKAES,TKIPTKIP WPA2PSKAES,TKIPTKIPdetailed information on the current association sudo SystemLibraryPrivate. FrameworksApple. VersionsCurrentResourcesairport Iagr. Ctl. RSSI             5. Ext. RSSI            0agr. Ctl. Noise            8. Ext. Noise           0state                     runningop mode                stationlast. Tx. Rate             3. Rate                3. Assoc. Status     0. BSSID                   0 2. SSID                     Guest. Net. MCS                     1. Tcpdump is a command line utility shipped with OS X that can perform packet capture. The tshark utility bundled with Wireshark is very similar. To perform a wireless packet capture using tcpdump first set the channel using the airport utility as shown abovethen perform a wireless packet capture, saving to a file. When done, type ControlC to exit. Example bash 3. I P i en. WARNING en. 1 no IPv. IEEE8. 021. 1RADIO 8. C8. 97 packets captured. Wi Fi Diagnostic. The easiest capture method is to use the graphical program called Wi Fi Diagnostics. It can be accessed by holding the ALT key and clicking on the top right wifi icon the one where you typically select the SSID you want to connect toClick on the Open Wireless diagnostics option in the list. It will bring a window that will run a default report on troubleshooting. This is typically NOT what you are interested in. Keep that window opened and go on the menu bar on top of the screen. Window. You will see a list of other interesting tools useful for site survey or signal analysis. In the scope of wireless sniffer capture, we are interested in the Sniffer option, click on it. You then simply have to chose the primary channel as well as channel width.