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Unknown User on my LAN


Tortorella's Rant

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In addition to the advice already suggested above, enable your router's MAC address filter and enter the MAC addresses for only the devices you want connected to the network. Terminate the Edgar-PC connection, reset your router, change your SSID and password.

With the MAC address filter, there is an additional layer of security for your network. Also, depending on whether you have a wireless gateway or are using a modem and router separately, I would recommend in the latter scenario to bridge your modem (turn your modem into a transport, so that the internet signal simply passes through it). Your router should be the control center for your network; having two devices that simultaneously want to be the router causes additional problems.

In terms of anti-malware software you should use, you should have both Malwarebytes and SuperAntiSpyware equipped. Run both in safe mode. I would actually recommend uninstalling Malwarebytes first, then reinstalling again because you can enable the 30-day Pro trial with scheduled scanning and updates, which is fairly helpful.

Why does my DHCP allow 253 host addresses to begin with? That seems stupid for a home LAN. I know how to configure MAC filtering in test environments at school but this is just a GUI and it only allows me to specify which MACs to block from accessing the Internet. And since I don't know Edgar's I can't do that, although I don't think that would help anyway.

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Just log on your router and check the connections list. If you don't see "Edgar PC" listed there, you're fine. It's probably some kind of cache on your PC. Otherwise, kill the connection, change you're password and make sure to disable WPS and to set your security mode to WPA2. Enabling WPS or using a WEP security is just asking for problems. Your router should be safe now.

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Why does my DHCP allow 253 host addresses to begin with? That seems stupid for a home LAN. I know how to configure MAC filtering in test environments at school but this is just a GUI and it only allows me to specify which MACs to block from accessing the Internet. And since I don't know Edgar's I can't do that, although I don't think that would help anyway.

MAC adresses are easy to clone so it won't really help you if the guy knows what he's doing.

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  • 2 weeks later...

It must be a virus then. Nothing malicious has happened and this guy has been on my computer for a couple weeks now. Something I do on my computer must activate it because it comes and goes. Edgar was there five minutes ago, I did a reboot, and now he's gone. I'm sure it'll be back once I open a certain file or folder; viruses and such can disguise themselves as valid programs. I also noticed the RAM was jacked up to over 6GB. I did the restart and now it's back at normal levels since Edgar isn't appearing in network connections. I run a computer network simulator for school which uses real IOS images and even that doesn't consume as many resources as Edgar apparently does. I'll just reinstall the OS when school's out. MalwareBytes, etc, can't find the virus.

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