How to Set Up a Router DMZ Host (and What to Watch Out For)

Follow these steps in order to understand and set up a DMZ host.

What a DMZ host is
A router's DMZ (demilitarized zone) host feature forwards essentially every incoming request that does not match another rule straight to one designated internal device. Your router normally acts like a firewall, blocking most unsolicited outside connections by default — but a device placed in the DMZ loses that protection and sits with nearly all of its ports exposed to the internet.
How it differs from port forwarding
Port forwarding opens only the specific ports you need — say, 80 and 443 — to a particular device, while a DMZ effectively exposes that entire device's ports to the outside. DMZ is generally treated as a last resort, considered only when a server or game using many ports keeps having problems that port forwarding alone cannot solve.
When a DMZ is actually needed
It is most often used temporarily, either to test a complicated server or program where it is hard to pin down exactly which port is causing the block, or to help narrow down the cause in an unusual network setup — like a double NAT situation — where port forwarding alone will not resolve the issue.
How to set it up
First, give the target device a static IP address, since the DMZ target needs to change whenever that device's IP does. Then, in your router's advanced settings or NAT/security menu, find the "DMZ" option, enable it, enter the device's static IP address, and save and restart the router to apply it.
The security risk and what to watch for
A device placed in the DMZ sits almost directly exposed to the internet, outside your router's protection, so its operating system firewall must be turned on, unnecessary services should be disabled, and every piece of software it runs should be kept fully up to date. A poorly secured device placed in the DMZ can become a direct entry point for an attack.
Always turn it off once you are done
DMZ should be treated as a temporary setting used for diagnosis or a specific special-case purpose, and switched back off as soon as it has served its purpose. If only specific ports are actually needed, using port forwarding instead of DMZ to open just those ports is far safer.

Port forwarding is enough in most cases

DMZ is closer to a stopgap used when it is hard to pin down exactly which port is required. If you know which port you need, opening just that port with port forwarding is a much safer approach.

Struggling with a game console NAT type?

If your PS5 or Xbox keeps reporting a Strict NAT type, it is worth trying the UPnP and port forwarding steps in a dedicated console NAT type guide before reaching for DMZ.

Frequently Asked Questions

If I put my console or PC in the DMZ, does that reliably fix connection issues?

It resolves most connection-related problems, but only at the cost of a real security risk, which is why it is not generally recommended. Try port forwarding just the ports you need first, and only consider DMZ as a temporary measure if that still does not work.

What if my router does not have a DMZ menu at all?

Some entry-level or carrier-supplied routers either do not support DMZ at all or bury it deep in an advanced settings menu. Try searching the manufacturer's manual for "DMZ," or if it is a carrier-supplied router, contacting support to confirm whether the feature is available.