How to Secure Your Wireless (Wi-Fi) Home Network

Follow these tips and you'll be well ahead of most home Wi-Fi users. Nothing will make you 1,000 percent safe against a truly dedicated hack. Crafty social engineering schemes are tough to beat. But don't make it easy on them , step up your security with these easy to do steps .With traditional wired networks, it is extremely difficult for someone to steal your bandwidth but the big problem with wireless signals is that others can access the Internet using your broadband connection even while they are in a neighbouring building or sitting in a car that’s parked outside your apartment.

This practice, also known as piggybacking, is bad for three reasons:

• It will increase your monthly Internet bill especially when you have to pay per byte of data transfer.

• It will decrease your Internet access speed since you are now sharing the same internet connection with other users.

• It can create a security hazard as others may hack your computers and access your personal files through your own wireless network.

[*] What do the bad guys use –Wireshark is a free packet sniffing tool for Linux, Mac and Windows that can scan traffic flowing though a wireless network including cookies, forms and other HTTP requests.

Step 1. Open your router settings page

First, you need to know how to access your wireless router’s settings. Usually you can do this by typing in “192.168.1.1” into your web browser, and then enter the correct user name and password for the router. This is different for each router, so first check your router’s user manual. You can also use Google to find the manuals for most routers online in case you lost the printed manual that came with your router purchase. For your reference, here are direct links to the manufacturer’s site of some popular router brands – Linksys, Cisco, Netgear, Apple AirPort, SMC, D-Link, Buffalo, TP-LINK, 3Com, Belkin.

Step 2. Create a unique password on your router

Once you have logged into your router, the first thing you should do to secure your network is to change the default password* of the router to something more secure.This will prevent others from accessing the router and you can easily maintain the security settings that you want. You can change the password from the Administration settings on your router’s settings page. The default values are generally admin / password.

[*] What do the bad guys use – This is a public database of default usernames and passwords of wireless routers, modems, switches and other networking equipment. For instance, anyone can easily make out from the database that the factory-default settings for Linksys equipment can be accessed by using admin for both username and password fields.

Step 3. Change your Network’s SSID name

The SSID (or Wireless Network Name) of your Wireless Router is usually pre-defined as “default” or is set as the brand name of the router (e.g., linksys). Although this will not make your network inherently* more secure, changing the SSID name of your network is a good idea as it will make it more obvious for others to know which network they are connecting to.This setting is usually under the basic wireless settings in your router’s settings page. Once this is set, you will always be sure that you are connecting to the correct Wireless network even if there are multiple wireless networks in your area. Don’t use your name, home address or other personal information in the SSID name.

[*] What do the bad guys use – Wi-Fi scanning tools like inSSIDer (Windows) and Kismet (Mac, Linux) are free and they will allow anyone to find all the available Wireless Networks in an area even if the routers are not broadcasting their SSID name.

Step 4. Enable Network Encryption

In order to prevent other computers in the area from using your internet connection, you need to encrypt your wireless signals.

There are several encryption methods for wireless settings, including WEP, WPA (WPA-Personal), and WPA2 (Wi-Fi Protected Access version 2). WEP is basic encryption and therefore least secure (i.e., it can be easily cracked*, but is compatible with a wide range of devices including older hardware, whereas WPA2 is the most secure but is only compatible with hardware manufactured since 2006.To enable encryption on your Wireless network, open the wireless security settings on your router’s configuration page. This will usually let you select which security method you wish to choose; if you have older devices, choose WEP, otherwise go with WPA2. Enter a passphrase to access the network; make sure to set this to something that would be difficult for others to guess, and consider using a combination of letters, numbers, and special characters in the passphrase.

[*] What do the bad guys use – AirCrack and coWPAtty are some free tools that allow even non-hackers to crack the WEP / WPA (PSK) keys using dictionary or brute force techniques.

Step 5. Filter MAC address

Whether you have a laptop or a Wi-Fi enabled mobile phone, all your wireless devices have a unique MAC address (this has nothing to do with an Apple Mac) just like every computer connected to the Internet has a unique IP address. For an added layer of protection, you can add the MAC addresses of all your devices to your wireless router’s settings so that only the specified devices can connect to your Wi-Fi network.

MAC addresses are hard-coded into your networking equipment, so one address will only let that one device on the network. It is, unfortunately, possible to spoof a MAC address*, but an attacker must first know one of the MAC addresses of the computers that are connected to your Wireless network before he can attempt spoofing.To enable MAC address filtering, first make a list of all your hardware devices that you want to connect to your wireless network**. Find their MAC addresses, and then add them to the MAC address filtering in your router’s administrative settings. You can find the MAC address for your computers by opening Command Prompt and typing in “ipconfig /all”, which will show your MAC address beside the name “Physical Address”. You can find the MAC addresses of Wireless mobile phones and other portable devices under their network settings, though this will vary for each device.

[*] What do the bad guys use – Someone can change the MAC address of his or her own computer and can easily connect to your network since your network allows connection from devices that have that particular MAC address. Anyone can determine the MAC address of your device wireless using a sniffing tool like Nmap and he can then change the MAC address of his own computer using another free tool like MAC Shift.

Step 6. Reduce the Range of the Wireless Signal (Only If Suitable)

If your wireless router has a high range but you are staying in a small studio apartment, you can consider decreasing the signal range by either changing the mode of your router to 802.11g (instead of 802.11n or 802.11b) or use a different wireless channel. (5 ghz channels are faster due to low static interference but are supported by lesser devices.

You can also try wrapping a foil around the router antennas so that you can somewhat restrict the direction of signals and boost the signal too simultaneously.

Step 7. Upgrade your Router’s firmware

You should check the manufacturer’s site occasionally to make sure that your router is running the latest firmware. You can find the existing firmware version of your router using from the router’s dashboard at 192.168.*.

Step 8. Use a VPN

A virtual private network (VPN) connection makes a tunnel between your device and the Internet through a third-party server—it can help mask your identity or make it look like you're in another country, preventing snoops from seeing your Internet traffic. Some even block ads. A VPN is a smart bet for all Internet users, even if you're not on Wi-Fi. I personally use Opera VPN on the desktop browser and the app by OSL technologies for Android.

Step 9. Turn Off WPS

Wi-Fi Protected Setup, or WPS, is the function by which devices can be easily paired with the router even when encryption is turned on, because you push a button on the router and the device in question. Voila, they're talking. It's not that hard to crack, however, and means anyone with quick physical access to your router can instantly pair their equipment with it. Unless your router is locked away tight, this is a potential opening to the network you may not have considered.

Step 10. Disable DHCP (last step for peace of mind, a bit difficult)

The Dynamic Host Control Protocol (DHCP) server in your router is what IP addresses are assigned to each device on the network. For example, if the router has an IP of 192.168.0.1, your router may have a DCHP range of 192.168.0.100 to 192.168.0.125—that's 26 possible IP addresses it would allow on the network. You can limit the range so (in theory) the DHCP wouldn't allow more than a certain number of devices—but with everything from appliances to watches using Wi-Fi, that's hard to justify.

For security you could also just disable DHCP entirely. That means you have to go into each device—even the appliances and watches—and assign it an IP address that fits with your router. (And all this on top of just signing into the encrypted Wi-Fi as it is.) If that sounds daunting, it can be for the layman. Again, keep in mind, anyone one with the right Wi-Fi hacking tools and a good guess on your router's IP address range can probably get on the network even if you do disable the DHCP server.

Connect to your Secure Wireless Network

To conclude, MAC Address filtering with WPA2 (AES) encryption (and a really complex passphrase) is probably the best way to secure your wireless network. Once you have enabled the various security settings in your wireless router, you need to add the new settings to your computers and other wireless devices so that they all can connect to the Wi-Fi network. You can select to have your computer automatically connect to this network, so you won’t have to enter the SSID, passphrase and other information every time you connect to the Internet.

Your wireless network will now be a lot more secure and intruders may have a tough time intercepting your Wi-Fi signals.

Who is Connected to your Wireless Network

If you are worried that an outsider may be connecting to the Internet using your Wireless network, try AirSnare – it’s a free utility that will look for unexpected MAC addresses on your Wireless network as well as to DHCP requests. Another option is that you open your router’s administration page (using the 192.168.* address) and look for the DHCP Clients Table (it’s under Status > Local Network on Linksys routers). Here you will see a list of all computers and wireless devices that are connected to your home network.

*It is also a good idea to turn off the router completely when you are not planning to use the computer for a longer period (like when you are out shopping). You save on electricity and the door remains 100% shut for wireless piggybackers.

**If you ever want to let a new device connect to your network, you will have to find its MAC address and add it to your router. If you simple want to let a friend connect to your wireless network one time, you can remove his MAC address from the router settings when he or she leaves your place.

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