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Wireless Basics

Introduction

In this earlier How To, I showed you how to convert a wireless router into an access point (AP). This how to will show you how to properly configure the second AP so that it works in harmony with your main wireless router.

1) Set the AP's Static IP Address

This was covered in the previous How To, but bears repeating. In this example, the existing wireless router has an IP address of 10.168.3.254 and a DHCP server range of 10.168.3.100 to 10.168.3.249.

So you can set the AP to any IP from 10.168.3.1 to 10.168.3.99 or 10.168.3.250 to 10.168.3.254, which are all outside the existing wireless router's DHCP server range. Figure 1 shows how to perform the change for a D-Link DIR-625 (or just about any D-Link router).

Setting the AP IP address and disabling DHCP

Figure 1: Setting the AP IP address and disabling DHCP

2) Connect the AP

This can be easy if you have Ethernet cabling at the location where you want to place the AP. But if you don't have CAT5 run to where you want to place the AP, consider connecting it via powerline networking.

Powerline networking uses your home's electrical wiring as the network cabling. So it provides the maximum flexibility for locating the AP. Figure 2 shows how to do it, using the IP addresses we're using in this example.

Connecting the AP via powerline networking

Figure 2: Connecting the AP via powerline networking

Powerline can be a good alternative to Ethernet, but not all powerline products are the same. The powerline networking industry seems like it has gone out of its way to prevent consumers from having a smooth powerline networking experience. There are two competing technologies that don't interoperate (HomePlug and UPA) and even versions of the same technology that don't interoperate (HomePlug AV and earlier versions).

The solution to this is buy two of the same make and model of powerline adapters. This will guarantee that they'll play together. And if you have problems, you won't get the run-around from the manufacturer's tech support. I recommend you go with either HomePlug AV or UPA 200 Mbps products. These have the best chance of not being a speed bottleneck.

When you install the adapters, they should be connected directly to wall outlets. Powerstrips with short cords and no line filtering are usually ok, but direct connection is best. Light dimmers and some fluorescent lights can generate noise that can lower powerline networking throughput. So don't plug either of them into the same outlet or even another outlet in the same room.

Note in Figure 2 that I haven't put IP addresses on the powerline adapters. This is because you usually don't have to worry about configuring them. They usually plug in and just work.

If you don't go with powerline networking, you just need to connect one of the AP's LAN ports to one of the primary router's LAN ports using a regular Ethernet patch cable.

Once you're connected, fire up your favorite web browser, enter the IP address of the AP (10.168.3.250 in our example) and you should get the login prompt for the AP.

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