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You could, of course, disable DHCP, but what I'd recommend doing (in addition to a number of other things that have already been mentioned) is to enforce MAC filtering. Make a list of all of the MAC addressess of any device connected to your network, then restrict access to your network to only your MAC addresses. If you need help with how to set this up, I'm sure you'll find ample help here. Don't be afraid to ask.
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If you're flammable and have legs, you are never blocking a fire exit. - Mitch Hedberg
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