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not sure of a program that can do it, but take a look in your router's settings for dhcp client table. you'd see that it distributed multiple IP addresses, which would indicate someone else is on your network.
I've had network slow down big time once or twice. Shut down, unplug your cable modem for a minute, plug it back in and let all lights come on and start your machine back up again. If that doesn't work, also try resetting the router as well, my linksys has needed that before.
and if you don't already have it in place, set up 128 bit WEP for your wireless connection, and make your password for it and the router tough. If you're in an area with a lot of people, change the channel you're on from 6 too. any changes on your router will also need to be made to the wireless computer you want to connect. that will help prevent anyone from leeching off your connection.
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Until the 20th century, reality was everything humans could touch, smell, see, and hear. Since the initial publication of the charted electromagnetic spectrum, humans have learned that what they can touch, smell, see, and hear is less than one millionth of reality
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