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unable to port forward - is this a CGNAT issue?

Highlighted
Level 2

Hi TPG

 

I have recently switched from ADSL to NBN. Since I switched I cannot get port forwarding to work. 

 

I have tried all the solutions that I can find on the community forums but non of them worked. I spoke to TPG online help but they were not able to fix the issue.

 

I have not changed any settings in windows since the switch to NBN, I have double checked my windows network settings, I have checked that my firewall is set up correctly to allow the port through, and I have re-installed the game.

 

My external IP address is different to my default gateway. When I do a tracert, the first hop is to my modem 192-168-1-1.tpgi.com.au and the next hop is to another private IP address 10-20-25-120.tpgi.com.au

 

Is this issue caused by CGNAT?

 

I would appreciate any help you can provide

 

Thanks

Andrew

 

 

 

3 REPLIES 3
Highlighted
Level 9

Is your game accessible from another device on your local network?

Does your game server have a fixed ip address in your wifi router?

ADSL had a static ip address. With NBN, you have a dynamic internet ip address which can change from time to time.  You can subscribe to a Dynamic DNS service; the router will have some setup to handle the change of external ip address.

Highlighted
Level 2

Hi David

 

There are no other devices on my network, only one PC connected by cable

 

My internal IP address always remains the same when I reboot the router, but the external IP and the default gateway both change.

    - internal IP is always 192.168.100.1

    - externa IP is the format 10.20.xxx.xxx

    - all parts of the external IP have changed xxx.xxx.xxx.xxx

 

When I try setting up a static IP address in windows I get a warning that the default gateway is not on the same network segment (subnet) that is defined by the IP and subnet mask. 

 

is this informtion useful?

 

Thanks Smiley Happy

Andrew

Highlighted
Level 9

Routers are normally 192.168.1.1. You should set up an address reservation in the router for the mac address of your computer. Make it 192.168.1.100.

Change windows so it accepts dhcp settings from the router (ip address, default gateway, subnet mask). Alter the port forwarding to match.

The 10.20 address is part of TPGs network.  "10.' addresses do not appear on the internet.

Somewhere in the router will be your real external ip address given by TPG.  The DDNS function in the router will keep your game server accessible to internet users, without them having to know your external ip address.