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I have my computer on 24/7. It's the most used device in my house. It gets used though out the day and into the night most days. I do have some power savings turned on. My NAT router gives me protection from the net but I also run a firewall on the computer. It's manly there for programs that make outbound connection. If I don't know what the program is that trying to make a outbound connection, then access is denied.
I'm a bit shocked that anyone thinks MAC address or WEP is secure. WEP keys can be cracked in under 60sec and MAC address in like 10sec. WEP was made be software engineers and not security people. It's a joke. I do have to say if you only have older hardware that only supports WEP then use it. It better then nothing. I would also be looking to see if I could upgrade to WPA by firmware. I use nothing less then a 63 character random encryption key (non dictionary) on my wireless (WPA) network. They say 20 is the minimum you should use.
As for MAC address. If your got a active wireless connections between your computer and the router. And I was to capture some of those packets between the 2 devices, I've got your MAC address. Then it's so easy to spoof the MAC address and make your router think my computer is your computer. The some goes with SSID. I've read and people have told me that it should be turned off. I can't see why. If you have got a active connection and someone is collecting the packets, then they can get your SSID from the packets
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