Extending Your Wireless Network

Many people struggle with setting up a wireless network that spans over multiple access points, or just simply adding an access point to an existing wireless router so that you can get better coverage. Some manufactures make it a bit easier, while others make it a real science to setup correctly. In most cases this can be simplified with a bit of work, and the outcome will make it worth your while.

Problem

In today’s average home we are depending more and more on wireless networking. Whether you are using security cameras, media streaming devices, or simply want to surf the internet while sitting in your back yard, signal strength and bandwidth have become primary concerns. The main problem people run into today is that in many cases, you simply cannot just add an additional access point and get the results that you want. This is especially true if you are mixing brands and model numbers. Depending on your house topology, construction, and the number of competing neighbors, you may actually decrease the effectiveness of your wireless network when trying to expand it. Most of the time, when you setup your first wireless router, the default settings work perfectly fine once you set the SSID and password. Once you try and expand it however, things don’t always work the way you want. Add to the equation the different standards such as G, N, AC, etc., and the different frequencies such as 2.4/5 GHz, and things get even more interesting when you try and expand it.

Solution

So how do you get the most out of your wireless network? Most, if not all, of the issues are caused by incorrectly set channel frequencies and interference. The truth is by default many of the wireless routers and access points try to use the same channel frequencies. They do not always do a great job at detecting other devices on your network. In addition, they often conflict with each other, and rather than extend your network they actually make it worse. They are in essence fighting for the same air space especially if they are somewhat close together. In a typical scenario, you might have a 2.4 GHz wireless router operating on channel 6 on one side of the house, then you want to extend that same SSID by adding an access point so that you can get stronger coverage throughout the house. What you might end up with instead is if the access points and wireless router are on the same channel, they may fight each other resulting in a reduced signal (see the picture for an example). In other words, the signals will drown themselves out if they are on the same channels in areas where the signal collide. What you really want to do in that scenario is to put the wireless router and access points on different channels, so that they do not overlap. This way as you walk around different parts of the house with your wireless device, it will attach to strongest signal (assuming your device supports it) without being confused which device is stronger. If you look at the coverage map below, you will see that when setup correctly, each router/access point can co-exist without interfering with one another if they are broadcasting on separate channels. This extremely critical when trying to use the same SSID, though it is great practice even if they are on separate SSIDs.

Conflicting and Overlapping Signals

SNAG-0100
 

 
Correctly Setup Wireless Network with Every Point on a Different Channel
 

SNAG-0103

In my particular setup, I use four access points. Some of them are on different SSIDs for specific tasks such as cameras, and some are on the same SSID and are used for extending. I will be adding one or two more to extend coverage into the garage and into the back patio in the upcoming weeks. I have a particular use case that is unique to me. However, it gives you an idea of what can be accomplished (see my other post for more information) when setup correctly. I have spent some time tweaking and adjusting the channels to give me solid performance and range across all these access points with minimal interference. Obviously if you have a simpler network, the task of tuning is much easier. Just to clarify, some manufactures’ devices are aware of other devices on your network. However, when you add different manufactures and model numbers, your chances reduce significantly that you will get the maximum results.

Suggestions and Other Things to Consider

  •      Let your first device, such as your wireless router, detect the best channel. Once it has done that, manually set it to that channel before setting up your additional access points.
  •     Whenever you want to “extend” an existing network, make sure that all settings, except the channels, are exactly the same. For example the SSID, security settings, and password need to be identical.
  •     Whenever possible, use a static IP address for access points to facilitate accessing your devices at a later date. This will also allow you to know which device has what channel settings.
  •     Write down each channel number for both the 2.4GHz and 5GHz setting for each device. This way you’ll be able to see if there is any overlap in the channels.
  •     Though you can set both the 2.4GHz and 5GHz SSIDs the same, it is recommend that they be set differently. Not all devices can use band steering and switch automatically between the lower and higher frequencies.
  •     Whenever possible, do not use the repeater mode available in some devices. Instead, have each access point go directly to a physical point in your network, such as a switch. Power Over Ethernet (POE) works great for doing this as you only have to run one cable. You can also add an inexpensive switch to a room where there is a network cable and add the access point to that switch.
  •     Some older devices may not automatically switch to a stronger access point, and they may have to be manually refreshed. This is not common on newer devices.
  •     Setting your channels manually is not just for the 2.4GHz networks. This applies equally to the 5GHz networks. You have more channels to choose from on 5GHz, but the problem remains largely the same.

 

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