Can I Disable CG-NAT on my Network? [Enabling Port-Forwarding]

[Gamefreaknet]

I have setup a Port-Forwarding rule in my Eero app that should allow for my friends to connect to a Minecraft server I have setup on a separate PC however whilst I could connect to the PC fine (through the Port-Forwarded IP and IP Port) my friends couldnt connect?
Whilst trying to diagnose why they couldn't connect I came across a post that mentioned that CG-NAT essentially blocks Port-Forwarding and apparently TalkTalk uses CG-NAT?

Can I confirm whether my Router is using CG-NAT?
If my router is using CG-NAT could this be disabled or could something be tweaked to allow Port-Forwarding to work?

[KeithFrench]

OK but I need to see the results, you have told me nothing. PM them to me to protect your privacy.

I do not like the sound of allowing all inbound TCP ports through a firewall, you are making your PC truly vulnerable. You just have to allow 25565 through. 

[Gamefreaknet]

I allowed all inbound ports through TCP on my firewall (in the Advanced Settings tab and it came up with - FIND: Parameter format not correct (I just copied what you put above - if thats a mistake on my part my bad...)

[KeithFrench]

Of course TalkTalk allow port forwarding. I have been doing this for years & never had any issues.

I have just tried this & proved that it worked first time. When running Minecraft on a PC all you need is to forward is TCP port 25565.

TCP 25565

So why doesn't yours work? It has nothing to do with DNS servers. Please can you run this from the  command prompt on the PC hosting Minecraft:-

netstat -an | find "25565"

Have you allowed this port through the PC's firewall in an inbound direction?

[KeithFrench]

I will look into this, but it may not be until tomorrow now 

[ferguson]

Ah, OK, beyond my competence levels I'm afraid, sorry.

[Gamefreaknet]

Swapped to the Cloudflare DNS servers and no difference

[ferguson]

I have no idea on the DHCP/NAT issue, but I have habitually avoided TalkTalk DNS servers for years. No idea if that will make a difference in your case. 

[ferguson]

I have no idea on the DHCP/NAT issue, but I have habitually avoided TalkTalk DNS servers for years. No idea if that will make a difference in your case. 

[Gamefreaknet]

Upon checking DNS settings (unmodified - still on Default DNS - I noticed yours was Customised) I did notice it had a set primary and secondary IPV4 IP on the default setting?
Also does the DHCP & NAT IP need to be the same as the server PC IP to port forward it?

[ferguson]

OK, ta. I will ask a more expert member of the group if they can help: @KeithFrench can you assist at all here please?

[Gamefreaknet]

I attempted doing this through the Eero App using my PCs IPV4 address as the Static port (I didnt touch anything except adding the IP address as my PCs IPV4 address and changing the port to 25565 (the default port Minecraft uses) using TCP & UDP
It didnt work with this setup. 
I tried using YouGetSignal to see if itd detect any open ports on that PC, using the default gateway (I checked through ipconfig in Command Prompt) or its IPV4 address and it said all of the ports were closed (it was still connected to my router via Ethernet)

By the way I am making sure to blur out stuff from MAC Addresses and IPs of my devices just for my own security. If those details are required/would help in diagnosing this please mention

[ferguson]

I don't have a specific answer to be honest, but if you go to the eero app settings there are a number of options available. Obviously, proceed at your own risk!

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