DMZ doesn't work, ports are still closed. MT6000

Technical Support for Routers
1

Running latest firmware: OpenWrt 21.02-SNAPSHOT r15812+1076-46b6ee7ffc Kernel Version 5.4.238

Ive been trying to open various ports but none of them work, so I put the computer in to DMZ and most common ports still don't work, and can't be reached from WAN.

21, 22, 23, 25, 53, 80, 110, 115, 135, 139, 143, 194, 443, 445, 1433, 3306, 3389, 5632, 5900, 25565

Ive reset, rebooted the router, and refreshed the firmware several times, still no go. I just need a single port to work for a very specific use, but even common ports are closed off.

Any advice what I can do?

2

Are you sure you are not behind CGNAT?

3

Sort of, i'm with Xfinity cable internet home service and here is the list of ports they are blocking. Blocked internet ports list - Xfinity Support

Im not using any of these ports in my setup.

Cheers.

4

It's not about port blocking, it's about CGNAT which should be 99,9% of all cable internet home services.

In that case you can't open ports nor DMZ devices.

1 Like
5

Ok, thank you.

Cheers.