Graphs are shown below the table that visualize the signal strength of the selected wireless networks over time. It is possible to select some or all of the wireless networks and observe their performance.

The visualization can help the user troubleshoot the wireless network. It could for example be that all or most of the wireless networks in the area are concentrating on specific channels for the communication. It could then help to switch to one of the transmission channels that are the least used in the area to improve the speed and performance of the wireless network.

InSSIDer is an Open Source software program that might be useful for users who want to troubleshoot, optimize or configure their wireless networks. Beta 1.2 of the program has been released a few days ago and is available for download on the developer’s homepage.

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The wavemon tool is a very handy tool to have in your arsenal that will help you gather information you might not otherwise have. With wavemon you can see Signal levels, Noise levels, Signal to noise ratios, frequencies, TX power, sensitivity (if available), bitrate, and so much more.

One of the only issues that might turn you off of wavemon is that it is an NCurses tool. This means the tool is run in a terminal window (I have found it runs best under Eterm) and uses ASCII to create the information it offers. Don’t let this cause you not to want to use wavemon because it is a very useful tool.

Getting and Installing

Wavemon is downloaded and installed from source. Download the tarball from the Wavemon site and save it to your hard drive. The installation steps are simple:

• decompress wavemon with the command bunzip2 xvzf wavemon-current.tar.bz2
• untar the archive with the command tar xvf wavemon-current.tar
• cd into the newly created directory with cd wavemon-current
• generate the make file will ./configure
• install wavemon with make ; make install
• start wavemon with the command wavemon

Wavemon Info Window

As you can see, in the image on the left, the Wavemon info window offers a lot of information.

At the bottom of the screen you will notice there are 10 possible options (of which some have no entries). Each of these options are different screens you can view.

The list of windows is:

• F1: Info. This is the main window that opens upon start up. This is where you get most of the information from wavemon.
• F2: Level Histogram. This displays a real-time bar-graph of Signal level, Noise level, and Signal-to-Noise Ratio.
• F3: Access point list. This feature has not been implemented yet.
• F7: Preferences. Configure Wavemon.
• F8: Help. Like a lot of Linux applications, wavemon shows the developer has a sense of humor. When you hit F8 for help it displays the message “don’t panic”. That’s it. There is more help by reading the man page (issue the command man wavemon).
• F9: About. Get all the information you need about the current wavemon release.
• F10: Quit.

You can also start wavemon with a few handy options. Those options are:

• -i This will override auto detection and use a specified network interface.
• -l Use linear level scales instead of logarithmic scales.
• -r Generate random levels for testing.

Final thoughts

If you need more information than your standard networking tools offer, and do not want to dump any extra cash into a third party offering, wavemon is just the tool for those looking to know everything there is to know about their networks. It’s easy to use, offers a ton of information, is open source, and has a tiny foot print.

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How easy you ask? Let me show you.

Locating the applet

The first thing you need to do is find the applet which will be in your system tray either in the top or the bottom panel on your GNOME desktop.

Network Manager Applet

How many bars do you have? As you can see I am already connected to a network. But what if I am not? Simple if you right click the applet a menu will appear which contains the “Edit Connections” entry.

Right Click Menu

Select the Edit Connections entry to open the Network Connections menu.

Network Connections

Click on the Add button to create a new network. This will bring up a simple window where you will enter basic wireless information.

Add Network

The first bit of information you should enter is the network SSID (the name of the network). Once you have that done you can click over to the Wireles Security tab, select the type of security (WEP, LEAP, WPA, etc), enter the Password, and click Apply.

Once you have created the network you can select the network by left clicking the applet to reveal the network listing.

Select Network

Of course the system will scan the surrounding networks and any network found will be listed in the Wireless Network listing.

If you select an already discovered network you will be prompted to enter the networks password.

Connecting

Final Thoughts

Connecting to a wireless network has become as simple as it is in any operating system. With the GNOME, as long as your card is supported, you should have your wireless connected in no time.

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The commands to backup and restore wireless network profiles on the command prompt are netsh wlan export profile name=”name” folder=”folder” and netsh wlan add profile filename=”name” just in case you are asking. Regular users however will never discover this possibility and that’s where Wireless Migrator comes into play. Actually it’s of course also helpful for tech savvy users who want to speed up the process.

The software comes as an executable named BackupWireless.exe that automatically creates the backup RestoreWireless.wnb of all wireless network profiles upon execution. Executing RestoreWireless.wnb will restore the wireless network profile on the computer.

The tool wants to register the wnb file extension at first start. To remove those Registry settings use the switch BackupWireless.exe /remove. To restore a wireless network profile without registered file extension use the command BackupWireless.exe RestoreWireless.wnb. A tool cannot be easier than this one, great work.

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While it does not seem to be that bad that someone else would use your wireless internet connection for surfing the web it becomes a very important matter if this is abused. Someone could download warez, pornography, commit fraud, send thousands of emails or share software in p2p networks. You will be held responsible for abuse that is done with your connection.

You need to know the basic information about your wireless router before you can begin to protect it.

• Who is the manufacturer
• What is the name of the wireless router

Visit the manufacturers website and search for updates for your router. Updates are normally in the form of firmware updates which update the internal functions to a new version which could result in additional features and security. Please consult the website for instructions on how to update the firmware of your router.

Make sure you update it using a wired connection because wireless connection tend to become unstable in the wrong moments. (Murphy’s law)

It is now time to protect the router further. Connect to the interface which is normally done by opening the IP of the router. (default 192.168.1.1 most of the time) Enter username and password and change them when your are logged in. Many routers get hacked because the user did not change the default login data that ships with the routers. Everyone can look them up and it is really easy to access the router even though everything else might have been optimized for security.

Now it is time to configure the security settings of the w-lan router. Add a service set identifier (SSID), it does not really matter how you name it, just remember the name. Make sure you disable the SSID broadcasting afterwards, this ensure that your wireless router does not show the SSID and it is a little bit more difficulty to find it out.

I know that this is a weak security tip but it could mean that this in addition with other security measures poses a problem for so called script kiddies.

Enable the strongest encryption method available, this is normally WPA2 with AES. If you have an older router or a device that does not support WPA2 you should think of buying a new router or updating the devices. Make sure you use a large string with numbers and letters. A good value would be between 20 and 30 chars for the key, make sure you remember it because you need to supply the key to the other devices that have to connect to the router.

Enable Mac filtering, look up your mac address by using the command line in Windows XP and typing ipconfig /all. The physical address is your mac address. This ensures that only computers with a Mac address that is listed in the router can connect to it. Please note that the Mac address can be faked.

If you do not need the full transmitter power because your router and computer are physically close to each other you could reduce the transmitter power to reduce the chance that someone from outside your walls will be able to find the router and connect to it. Please be aware that a good antenna on the device that wants to connect to your router is able to counter this strategy.

Here is a list of other ideas that are worth investigating.

• Disable all services that you do not need.
• It is a very good idea to power off the router when you do not need it to prevent anyone from connecting to it while you are away. Alternatively turn off the wireless function of the router.
• If you have the means monitor the traffic of your wireless connection to find out if someone else uses it as well.
• Enable the firewall of the router and configure it properly
• If the router has a logging feature enable it and analyze it regularly.
• Limit the maximum number of DHCP addresses if you use that feature.
• Use Authentication if possible.

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We had to do a scan of the surroundings of course and found lots of unsecured wireless lan networks. I don´t know why people keep these unsecured, maybe its laziness, maybe they simply don´t know the risks involved. Its like leaving your doors open when you leave your house. Lots of things can happen..

Others could use your internet connection to surf the web, to spam, download copyrighted files or hack other servers, and do even worse stuff. All using your connection. Guess on whose door the police will be knocking ?

Router / Access Point

This is your main configuration unit. If someone gets access to it he will be able to change lots of preferences like passwords, encryption and mac address. Most routers have default passwords and SSID´s which have to be changed by their owner to make the entire system more secure.

1. Default Login

Your first task is to change the default user login to something else. Routers normally have default usernames and passwords like admin / 0000 or similar. You normally configure your wlan router using a web browser and the routers ip. Those are the username and password you enter when you want to change the configuration.

2. Updates

Visit the manufactures website and look for updates for your router / access point. Often those updates include security updates as well, recommended to to every once in a while.

3. Infrastructure / Ad-Hoc

With infrastructure mode enabled all deviced connected to the wireless lan communicate through the access point / router while the Ad-Hoc mode allows for direct communication. Disable Ad-Hoc mode if available.

4. SSID

The SSID, Service Set Identifier, identifies your router. Companies use default ones like wireless or wlan which are easy to guess. Choose a more secure password, best is a combination of letters and numbers.

Disable the SSID Broadcasting, which transmits its name to everyone in range.Wireless stations searching for a network connection can ‘discover’ it automatically, not needed if you know the SSID and configure your computers the way. It does not make sense to change the name but leave broadcasting on.

Note its still possible to sniff the SSID, its still send in clear text when a client associates with the router / access point.

5. Pings

Turn of Broadcast pings on the access point / router this makes it invisible to 802.11b analysis tools.

6. Mac Address Filtering

Every network device has in theory a unique MAC address. You can configure your access point / router the way that it only accepts connections from the mac address(es) you specify. Its possible to sniff your mac addresses and fake them, don´t rely on this alone.

On windows open the command prompt and enter ipconfig /all

The Physical Address is your MAC address, make sure you selected the right device, a wlan pci card for example.

If you are not using windows go to this website, it explains how you find it on your operating system.

7. Remote Management

Disable if not needed.

8. WPA, WPA2 or WEP

If your access point offers WPA2 encryption use it. WPA2 uses AES encryption. If you have an older access point use WPA and as last resort use WEP. Make sure you chose passwords that are more or less immune against dictionary attacks and chose the highest available encryption option (232 ->104 -> 40)

9. Wlan Coverage

It does not make sense most of the time to provide wlan coverage for a wider area than your own appartment. You can experiment with lowering the transmit level and the use of directional antennas to reduce the area your wlan covers.

Its a good idea to change the encryption keys and the SSID every now and then. The best protection is of course to turn your wireless network off if you don´t need it.

[tags]wifi, wlan, wireless lan, secure, network, wireless network, ssid, broadcast, wep, wpa, wpa2, router, access point[/tags]

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