Port Forwarding set-up on T3200M / Firewall set-up

[wireless]

Hi there!

I have recently logged-in into the settings of my T3200M modem from Telus to check how the firewall was set-up, and I discovered that there were lots of port forwarding rules set-up on the device. Over 20 or so, all from the same LAN start/end port, over TCP to various WAN start/end points. I didn’t set them up, so I assume this was done by Telus.
I don’t have any other modem/router, everything is connected directly to T3200M. My home Wi-Fi is set-up through a separate access-point (also from Telus) which is connected to T3200M via ethernet. Some other devices are connected via ethernet as well (TV, NAS, PlayStation, etc).

My questions are:
1. Is the port forwarding something that Telus normally does when setting up their network? Do I need those, and if so - why? Or can I remove them?
2. Is the firewall setting “NAT only” adequate, or should it be changed to low/medium instead?

thanks everyone.


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