I’m trying to put the modem to the bridge mode so I can port forward but it is just not happening!
If the 5366TN had a bridge mode you wouldn't be able to port forward as that is a routing feature, and the purpose of bridge mode is to bypass all routing.
so I can port forward but it is just not happening!
The port forward settings are in Network Settings --> Port Forwarding.
3. DMZ mode turned on in the Optus modem settings and the wifi is off.
Using DMZ port forwards everything and bypasses the firewall, so its better then just port forwarding.
Any help to fix this would be much appreciated.
What problems are you actually having? Using DMZ should have fixed most issues, but it will not fix them all.
I have port forwarding rules set on the nest wifi to access devices remotely but Optus modem keeps overriding them.
If you have set the Optus modem to DMZ to the nest then it can't be overriding the port forwarding because DMZ forces every all ports to go to the nest, and it should be overriding Optus' firewall as well.
With the port forwarding setting on the nest, are you setting the source IP, or are you laving it blank? If not what is it?
I followed everything to the dot but doesn’t seem to work.
You may also need to disable NAT on the Optus router (on firewall settings page).
How are you testing the remote access? From another internet service, or are you just using an online port scanner to see if the ports are open?
It is the bloody Optus modem that I need help with. Why can’t they understand that? 🤷🏻♂️
Because the very limited tech training. Unless a problem fits neatly into one of their troubleshooting scripts they either have no clue what to do, are are not allowed to spend any more time on the problem.
I have set to DMZ mode and pointed to the nest and one would hope that fixes the issue 🤷🏻♂️
That would suggest that the problem is more likely with the nest. So before you got the nest did remote access to the pi work when connected directly to the Optus? If not, or you hadn't tried that before then I suggest you skip the nest for now and plug the pi into the Optus for testing. First see if the pi work without DMZingo to it, and then try with DMZ.
On the nest, I have reserved IP address for my raspberry pi and assigning port forwarding rules to allow port 8123 and 443.
In the port forward rules, what do you have for source IP? Is it blank? If not, what IP are you using?
I noticed the NAT is on. Turning it off breaks the internet for some weird reason. 😵
NAT is basically the router function, so disabling it kills the Optus' router.
When you have two routers together you get a double-NAT situation which is generally not a problem but can cause some issues. For example in double-NAT you'd usually be able to play internet connected games on a games console fine, except when you tried to host a game. I don't know if/how that might affect remote access in your situation.
I'm not overly familiar with how things are supposed to work with NAT off, but I think the DMZ should have worked with NAT off as long a you give the nest a fixed IP address (from within the nest, and not reserved in the Optus).
I’m checking through an online port checker
They are not too useful in confirming that a port is open because they can not detect open ports if the device/app that is listening to the open port is wilfully ignoring the port scans.
trying to connect to raspberry pi through my iPhone via 4G mobile data.
That should be a reliable way to test.