How to Add a Mobile Wireless Hot Spot to Your Network

So you have a cellular phone or dedicated 'hot spot' gadget. It's OK for connecting one or two computers to the internet, but it is insufficient for a wireless network on its own, sending backups to network attached storage, moving files between computers, etc. You probably have a router/switch to do all of that grunt-work, but connecting to the wireless device is a problem.

Three words: WIRELESS ETHERNET BRIDGE

Steps

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A web search for 'wireless ethernet bridge' will turn up lots. Be sure to download and read the manual for the device, so you know what you'll be getting yourself into.
Be sure you use the RIGHT password, as it generally won't tell you that you've messed up. Every device is different. Most come with some software. Most have a 'web page' interface to configure it without the software. Read the manual.
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If it's a switch, you're done. If it's a router, make sure it's plugged into the 'WAN' port.
The DHCP on the wireless device will handle everything.
into the router/switch.

Method 1

Method 1 of 1:

At Home (Apple Time Capsule, T-Mobile 4G Hotspot, WET610N)

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The default password isn't easy to remember, and all numeric, which makes it supremely weak against attack. Mine had the 'Manual' inside it, along with the web interface. Once the software for it was installed, setup was easy, if you are used to setting up Wi-Fi devices.
This was a LOT more difficult. The 'Wi-Fi Protected Setup' did not work. It didn't come with OS X software, and the 'Mac software' on their support site doesn't install. So I had to track down how to configure the web interface (Web Search: Installing WET610N using the Web-Based Setup Page). Connect it to the 'Hot Spot', and get the password RIGHT.
In this case, a 'Time Capsule 2TB'. 'Connect Using': Ethernet. 'Connection Sharing':Off (Bridge Mode).]
Instead of 'Bridge Mode', Disable DHCP on the wireless hot spot, then use 'Connection Sharing: Distribute a range of IP addresses', and manually configure the IP addresses for 'hot spot', router and DHCP addresses so they don't conflict. Configuring this way 'may' require you to change the settings back on the 'hot spot' when you hit the road and want to share the connection again. On the plus side, this will definitely work around any 'limits' the 'hot spot' has on number of active connections.
They should all share the internet connection whenever the wireless hot spot is turned on and in range of it.

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How and where can I found my IP address and the router?
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Go to Start, then Run. Type CMD, press the Enter key and then ipconfig /all. Note that there's a space in between 'g' and '/'. Then press the Enter key and look for IPv4, which is your IP address. Default Gateway is your router IP.
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Tips

The 'T-Mobile 4g Hot Spot' needs to be manually disconnected from the internet through its web interface before most of its internal settings can be changed.
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The 'Time Capsule' has more options under the 'Wireless Mode', if you hold down Option (alt) when you click it in the Airport Utility. However, connecting to the 'Hot Spot' as a client will disable your Time Capsule Wi-Fi, AND (quite evilly) disable the built-in ethernet ports. You can still connect to the Wireless Internet device its self, but these mobile things are pretty weak/slow to do backups through as the 'heart' of your network.
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You may want to statically set the 'hot spot', ethernet bridge and router IP addresses. It simplifies administration greatly. For instance, with the WET610N, if your network is '192.168.1.*', but the WET610N configuration is '169.254.1.250' by default, it can become unreachable for configuration once everything is up and running. So if you leave the 'Hot Spot' at 192.168.1.1, 192.168.1.2 as your router, and set up 192.168.1.3 as your bridge (and keep these numbers out of the range of your DHCP), then you can go to 'http://192.168.1.3' to reach the bridge configuration, rather than have to unplug everything, plug your bridge into the computer, re-configure the ethernet port to a compatible address, configure, than plug it all back in right again.
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Warnings

Use nice, LONG, SECURE passwords containing mixed case letters, numbers and symbols. Write them down and file them away. Unless you want 'pedobear' browsing porn, or hacking government web sites from his van across the street... directly through your home network connection, eating up the bandwidth that you pay for, at least up until a SWAT team pays you a visit and shoots you in your bed for looking surprised.
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Don't 'extend' a network that doesn't belong to you.
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Any Network Attached Storage (ala 'Time Capsule') that you don't want to share with every person who visits and connects to your network should also have a password on it. No exceptions. Your nieces and nephews can be evil little buggers, and your family and friends can become nosey at 1:00am when they can't sleep.
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Things You'll Need

Some sort of 'Wi-Fi Hot Spot' or smart phone with Wi-Fi sharing capabilities enabled, with a cellular service plan that allows such functionality to work.
A Wireless Ethernet Bridge
A wireless router or network switch that connects to your home (or very small office) network.