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KingKannibal: Through the modem? It's how I got a few games to work a while ago via LAN a long time ago before UPnP was common and I had no idea how to port forward at the time.
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teceem: DMZ is not about getting games to work, it's about isolating computers or networks from other networks.
[url="https://en.wikipedia.org/wiki/DMZ_(computing)"]https://en.wikipedia.org/wiki/DMZ_(computing)[/url]
I've read plenty articles about blocking internet access (outgoing), but few about completely isolating a PC on a network from the WAN side (incoming+outgoing). And Mac Address Filtering also blocks PCs from accessing the local network.

I know this is completely off topic here; but does anyone here know how to configure a router with DD-WRT to block all and only WAN traffic to and from a certain PC?
You're right, I checked in with someone who was around at the time and what we did was completely shut off firewalls for everyone while unhooking from the internet. The DMZ thing was something a friend suggested for Minecraft since we were letting friends who downloaded cracked clients join the server.
Post edited July 20, 2019 by KingKannibal