Someone else's computer is on my network, how do I block them?

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Someone else's computer is on my network, how do I block them?
I recently took a look at my multiple networks and noticed a computer that is not mine, including media devices. I assume they're one of my neighbors and want to block access to my network, but after searching the internet I haven't found an

Someone else's computer is on my network, how do I block them?
I recently took a look at my multiple networks and noticed a computer that is not mine, including media devices. I assume they're one of my neighbors and want to block access to my network, but after searching the internet I haven't found an answer. Help appreciated.

I have a NETGEAR N600 wireless dual band router.

Other answer:

Sarah:
Its not very hard to break into someones router if they have not changed the actual admin information from the default. I say this because, even though you may change the password thats used to connect wifi devices to your network, anyone can go into your router (if the default admin info hasnt been changed, by using the default Netgear info) and get the password. Changing the default admin login info puts a stop to that. So first change the admin login and password then change your connection password (and maybe the SSID if you choose to do so). This will put a stop to outsiders using your wifi and/or protect you from someone locking you out of your own router. For an easy fix to accessing your router, download the Netgear Genie app. It's interface is easier to use than the browser admin panel AND you can get the app on mobile devices.
http://www.netgear.com/home/discover/app…
micksmixxx:
As others have stated, ma'am, you need to change the password on your router. The following webpage advises you on the steps you need to follow to do this. (This changes the password for your router.)

The manual for your router is the second link below. This offers information on how to change the password too. (It's a .pdf (Portable Document Format) file so you'll need to have a PDF Reader program installed on your computer to be able to read it. There are several FREE ones available, such as Adobe Reader or Foxit Reader.

GTB:
I assume the hacker is hacking in via wireless. Go back and reconfigure wireless to use WPA2 encryption; change the preshare key (password) to a very strong one that is not easy to figure out); change the SSID; implement MAC address verification for admission to the network and add the MAC address of each device you wish to permit to access to the MAC validation table; reconfigure all devices you want on the network and the hacker will be pushed out.
chrisjbsc:
Change the wifi password on the router.
Anon:
change router password

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