9 Common Mistakes Setting up a Wireless Network

Tina Sieber 18-08-2009

wireless networkWireless internet at home is incredibly comfortable. Once everything is set up and running, you can easily connect multiple devices over the air and move them around the house freely.


The trouble is setting up the network and eventually figuring out how to connect each device. There are some common mistakes that are best avoided in the first place. If you’re struggling with your WiFi, let this be your "WiFi For Dummies" troubleshooting guide.

1. Not reading manuals

This should be common sense. Your WiFi setup depends on the router you have and the devices you want to connect. Thus it’s essential to read the respective manuals and follow their instructions. Some of the following mistakes can be avoided simply by reading manuals.

2. Using default passwords

wifi for dummiesYour wireless router comes with a default password for its administration interface. The password is required to log into the device and configure countless critical settings. To avoid damage it’s essential to secure this area by replacing the default password with a strong password. The same applies to all devices you’re going to connect to your wireless network.

3. Failing to turn on WiFi transmission

Especially laptops and mobile phones have buttons or software settings that allow you to turn on or off wireless transmissions. Naturally, you won’t be able to locate a wireless network, let alone connect to it as long as WiFi is turned off on your laptop or phone. More details can be found in the device manual.


4. Mixing or excluding wireless standards

There are several wireless standards or WiFi technologies available: 802.11a, 802.11b, 802.11g, and 802.11n. 802.11n is the latest standard and supports higher bandwidth as well as multiple wireless signals and antennas (MIMO technology). This article on explains the differences in detail.

You may have devices supporting different standards and you should sort this out before purchasing a router or a device you want to connect to an existing router (i.e. read manuals). In general, it’s best not to mix wireless standards. You’ll see the best performance, if all connected devices "speak the same language", i.e. use the same standard. For example a device running using outdated wireless technology may slow down the entire network, even for devices that support higher standards.

That’s also the reason why many routers have an option that excludes devices only supporting old standards. So if you cannot connect your old laptop to your wireless network, maybe your router is configured to support only 802.11g and up, while your laptop only supports 802.11a.

5. Mixing encryption standards

wifi for dummiesNew devices support different forms of WPA (Wi-Fi Protected Access) encryption. The old encryption standard WEP (Wired Equivalent Privacy) should be avoided because it’s easily cracked.


Most users will be smart and set up their router with WPA encryption. Now what would happen if you tried to connect a device that only supports WEP, for example a PDA, to such a network. Of course it would not work! Again, it’s essential to read the manuals and understand which encryption standards are supported by the devices you want to connect.

If WPA is your only option, make sure you have a strong password, i.e. random, alphanumeric and longer than 10 characters. Don’t skip encryption! Even if WPA can be cracked, it does require a few minutes and a bit of skill, so your regular neighbor will probably be too lazy to try.

6. Badly configured firewall

One of the main reasons a computer won’t connect to a wireless network is a firewall that denies the connection. To test this, simply turn off the firewall and try again. If the firewall was the cause, learn how to configure it properly (check out a few WiFi For Dummies books from your local bookstore to learn more) to allow WiFi access.

7. Spelling

how to set up wifiAnother mistake could be transposed digits or wrong spelling of manually entered IDs, passwords, MAC addresses etc. that are required to setup the network or connect a device. When you’re receving a signal, but cannot connect, make sure your WEP or WPA key is correct. Double check!


8. Not using any security

Your data is transmitted over the air and it is an easy target for anyone trying to spy on you or hack into your system. So any security measurement is better than none. Use passwords, use strong passwords, use encryption, use a firewall or at least turn on Windows’ default firewall, monitor your traffic.

For more information about securing your WiFi connection, read these articles:

From Tim: How To Set Up Your Own Secured WiFi Hotspot How To Set Up Your Own Secured Wi-Fi Hotspot Read More

From Aibek: How To Secure Your Wireless Network Connection 7 Simple Tips to Secure Your Router and Wi-Fi Network in Minutes Is someone sniffing and eavesdropping on your Wi-Fi traffic, stealing your passwords and credit card numbers? Would you even know if somebody was? Probably not, so secure your wireless network with these 7 simple steps. Read More


From Karl: Things To Know When Using a WiFi Hotspot Or A Public PC Things To Know When Using a WiFi Hotspot Or a Public PC Read More

From Tina (me): Is Your Wireless Network Safe? Check If Your Wireless Network Safe With AirSnare Read More

9. False sense of security

how to set up wifiYou may have changed all default passwords, turned off DHCP (Dynamic Host Configuration Protocol), set up MAC (Media Access Control) filtering, turned off remote router administration, turned on the router firewall, set up a firewall on your computer, and hidden your SSID (Service Set Identifier) beaconing and you probably feel safe.

Apparently, some people also try to secure their WiFi network "physically". They place the router in a central location of the area they want to cover and reduce the signal until it can not be detected outside that area. I hope they don’t forget that the signal is transmitted three-dimensionally. Also, someone using a strong antenna, e.g. a determined hacker, will still pick up the signal and invade the network.

Among harmless neighbors, you probably are safe even if you don’t apply any security measurements. But for a skilled hacker, you’re still a relatively easy target, despite all the precautions. Each security layer can be cracked separately and it’s only a matter of time until WPA will be hacked. So never feel too safe, back up your data and disconnect sensible data from connected devices.

If you’re interested in wireless internet, you should check out Guy’s other great WiFi for dummies type article Technology Explained: How Does Wireless Internet Work? How Does Wireless Internet Work? Live in the country and wondering how wireless internet provides broadband coverage to rural areas? Here's what you need to know. Read More and if you’re going to set up your own network, download the Home Networking Guide Everything You Need to Know About Home Networking Setting up a home network is not as hard as you think it is. Read More PDF that was written by Stefan.

What other problems or mistakes did you encounter in setting up a wireless network?

Image credits: duchesssa, rolve, flaivoloka, groenmen, clix

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  1. Kunal
    January 14, 2010 at 2:05 am

    Great article. Would be helpful if you compared WPA to the security with MAC addresses. Still trying to figure out which is more secure.

  2. Don
    September 27, 2009 at 1:42 pm

    I have two laptops. One can connect to the internet, wirelessly. The other cannot. I am using a Belkin N+ router. Does anyone know how I can get the other to connect. Both laptops are exactly the same...

  3. Art_Teac
    August 27, 2009 at 5:19 pm

    This just in...

    WPA encryption cracked in one minute - 27 Aug 2009:

  4. Art_Teac
    August 20, 2009 at 1:53 pm

    There's plenty of sobering literature out there:

    WPA Wi-Fi encryption (partially) cracked - November 6th, 2008:

    How To Crack WPA / WPA2:

    How to avoid the WPA attack entirely - Jan 12, 2009:
    [Broken Link Removed]

    GPU-Accelerated Wi-Fi password cracking goes mainstream - January 22nd, 2009:

    Understanding the WPA/WPA2 Break:

  5. charleyrouse_nerds on site
    August 19, 2009 at 5:22 pm

    For # 7 : to prevent Spelling Errors:

    Typoe the password into Notepad or TextEdit and copy and paste into the Password Field, Zero Spelling Errors...

    • Tina
      August 20, 2009 at 6:30 am

      That's a very good suggestion and certainly the best method! However, if you want to use WiFi on a device like your phone or a game console, it may not be practicable.

  6. Alex
    August 19, 2009 at 1:01 pm

    Wpa has been cracked and the tools are already built into free penetration testing suites like backtrack. but to crack Wpa you need a lot of time because you need to capture a bunch of log-ons and then spend about 3 weeks brute forcing them. so your still not safe from the NSA but your safe from most ten year olds stealing your wifi. and once it can be cracked in a matter of minuites like Wep a new, more secure standard will come along.

  7. Daniel Egeberg
    August 18, 2009 at 2:49 pm

    [...] and it’s only a matter of time until WPA will be hacked.

    I was under the impression that WPA and WPA2 had already been cracked once by a Russian group using Nvidia based GPUs and CUDA, which netted a significant improvement in speed over using the CPU.

    Well, strictly speaking it might not be a crack because it was brute-force, but still...

    • Tina
      August 18, 2009 at 4:44 pm

      Thanks for the input Daniel, I had not heard about that one before. But I have to admit I'm not an expert and relied on the articles I read while researching for this article.

  8. Bob
    August 18, 2009 at 1:36 pm

    I'd be interested to hear about techniques involving two routers to sequester a wired network from a wifi network. Has anyone done something like that?

  9. Josh
    August 18, 2009 at 12:25 pm

    Nice article. However at this time, this conversation should revolve around WPA2 rather than omit it.

    Still #9 will always be salient, WPA2 or not.


    • Tina
      August 18, 2009 at 4:48 pm

      You're right Josh, thanks for clarifying! Generally, the latest generation of encoding is the most secure, in this case WPA2.

  10. john
    August 18, 2009 at 11:25 am

    this is a helpful guide. thank you very much.

  11. Smith
    August 18, 2009 at 10:13 am

    In my own experience WPA is safer than WEP. Because the secret key is encrypted little bit more safer in WPA.