12 Ways to Secure Your Wi-Fi Network

12 Ways to Secure Your Wi-Fi Network

Worried about the security of your Wi-Fi connection? Follow these steps and you'll be in a wireless Fort Knox.

1. Change Your Router Admin Username and Password

Every router comes with a generic username and password—if they come with a password at all. You need it the first time you access the router. After that, change them both. Immediately.

If you forget the new username/password, you should probably stick to pencil and paper, but you can reset a router to its factory settings to get in with the original admin generic info.

2. Change the Network Name

The service set identifier (SSID) is the name that's broadcast from your Wi-Fi to the outside world so people can find the network. While you probably want to make the SSID public, using the generic network name/SSID generally gives it away. For example, routers from Linksys usually say "Linksys" in the name; some list the maker and model number ("NetgearR6700"). That makes it easier for others to ID your router type. Give your network a more personalized moniker.

3. Activate Encryption

This is the ultimate Wi-Fi no-brainer; no router in the last 10 years has come without encryption. It's the single most important thing you must do to lock down your wireless network. Navigate to your router's settings and look for security options. Each router brand will likely differ; if you're stumped, head to your router maker's support site.

Once there, turn on WPA2 Personal (it may show as WPA2-PSK); if that's not an option use WPA Personal (but if you can't get WPA2, be smart: go get a modern router). Set the encryption type to AES (avoid TKIP if that's an option). You'll need to enter a password, also known as a network key, for the encrypted Wi-Fi.

This is NOT the same password you used for the router—this is what you enter on every single device when you connect via Wi-Fi. So make it a long nonsense word or phrase no one can guess, yet something easy enough to type into every weird device you've got that uses wireless.

4. Double Up on Firewalls

The router has a firewall built in that should protect your internal network against outside attacks. Activate it if it's not automatic. It might say SPI (stateful packet inspection) or NAT (network address translation), but either way, turn it on as an extra layer of protection.

5. Turn Off Guest Networks

It's nice and convenient to provide guests with a network that doesn't have an encryption password, but what if you can't trust them? Or the neighbors? Or the people parked out front? If they're close enough to be on your Wi-Fi, they should be close enough to you that you'd give them the password. (Remember—you can always change your Wi-Fi encryption password later.)

6. 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. As some say, you need a VPN or you're screwed.

7. Update Router Firmware

Just like with your operating system and browsers and other software, people find security holes in routers all the time to exploit. When the router manufacturers know about these exploits, they plug the holes by issuing new software for the router, called firmware. Go into your router settings every month or so and do a quick check to see if you need an update, then run their upgrade. New firmware may also come with new features for the router, so it's a win-win.

8. 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.

9. 'Debunked' Options

Many security recommendations floating around the Web don't pass muster with experts. That's because people with the right equipment—such wireless analyzer software like Kismet or mega-tools like the Pwnie Express Pwn Pro—aren't going to let the following tips stop them. I include them for completion's sake because, while they can be a pain in the ass to implement or follow up with, a truly paranoid person who doesn't yet think the NSA is after them may want to consider their options. So, while these are far from foolproof, they can't hurt if you're worried.

10. Disable DHCP

The Dynamic Host Control Configuration 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.

11. Filter on MAC Addresses

Every single device that connects to a network has a media access control (MAC) address that serves as a unique ID. Some with multiple network options—say 2.4GHz Wi-Fi, and 5GHz Wi-Fi, and Ethernet—will have a MAC address for each type. You can go into your router settings and physically type in the MAC address of only the devices you want to allow on the network. You can also find the "Access Control" section of your router to see a list of devices already connected, then select only those you want to allow or block. If you see items without a name, check its listed MAC addresses against your known products—MAC addresses are typically printed right on the device. Anything that doesn't match up may be an interloper. Or it might just be something you forgot about—there is a lot of Wi-Fi out there.

12. Turn Down the Broadcast Power

Got a fantastic Wi-Fi signal that reaches outdoors, to areas you don't even roam? That's giving the neighbors and passers-by easy access. You can, with most routers, turn down the Transmit Power Control a bit, say to 75 percent, to make it harder. Naturally, all the interlopers need is a better antenna on their side to get by this, but why make it easy on them?

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