I'm trying to set up a home network with a new wireless router (LG-ERICSSON WBR-3020). I am using WPA2-PSK encryption with AES. When I enter the passphrase on my macbook air (OSX 10.7.2) it connects flawlessly when given the passphrase, and similarly with an iPad, and iPod touch. On my Windows Vista laptop, when I give the correct passphrase it has "limited or no connectivity." This computer uses an Atheros AR5007EG Wireless Network Adaptor. In the wireless connection properties, all the boxes are checked, including IPv4, IPv6, and Client for Microsoft Networks. (Unchecking IPv6 as some people have suggested does not help). IPv4 is set to obtain an IP address and DNS server automatically.
When I've had trouble like this it normally means the wireless network driver does not support that particular form of network encryption.
You can test this by setting your security to WPA(1) and seeing if the Windows computer connects OK to that.
Also, I'd try disabling any special utilities managing your network, none of them do any more than Windows does, and none of them does it as easily either.
Can you ping computers on your network? If you can't, or the adapter shows 0 packets sent, try downloading the latest drivers for your wireless adapter. After Windows XP, Windows got proficient at connecting to wireless networks out of the box, but in rare cases some adapters aren't fully supported by Windows.
Edit: If that doesn't work, @music2myear is probably right: your adapter doesn't support WPA2 encryption.
In building A, I have a Netgear wireless access point using WPA2. Works great, no problems.
In building B, I have some devices that only have wired Ethernet ports. They can't see my access point.
What I need is a gizmo that connects over-the-air to my access point in building A, talks WPA2, and converts the packets to and from a wired Ethernet port.
Netgear-access-point in building A
Wireless bridge device <-- Looking for this.
My devices in building B.
I've looked for devices on Amazon, but the descriptions are infuriatingly unclear. It says it supports WPA2, but does it support it as a client? Grrr...
Any recommendations please?
A linksys router flashed with DD-WRT and setup as a Wireless Bridge will do the trick. Assuming, you can receive the signal from wireless network in Building A from Building B. It'll use the wireless link to create a bridge between Building A and Building B allowing wired-ethernet connected clients in Building B to see all clients (wired and wireless) in Building A.
If you've got a computer between it you could try out ICS (on windows) or the linux equivalent. You could possibly get another router with both wireless and ethernet ports, install DD-WRT on it and setup wireless bridging.
i use one and have no problems with it. this device should allow you to connect a switch to its port and then connect all the devices you need to the switch. I haven't tested this but it doesn't appear to do anything odd that would prevent it. My friend bought a similar device which called itself a "Game adapter". It did odd things with the mac address of the device connected so it only supported a single device.
There's an interesting article, Long Range Links Explained, that contains some useful info about how to get a signal across a few kilometers using antennas, and recommends some suitable hardware.
Many other companies manufacture such hardware, and I have even heard of a case where the problem was solved using a tin-can as antenna.
A very fast google search found, for example, RadioLabs WiFi Networking which contains several solutions of differing types, among which the GS-1000 seems to do what you ask (I have no experience with it) on up to 5 miles line of sight,
while the GS-2400 can do 20 miles.