Port Forwarding Not Working VMB5000

[PGalore]

I got a new router Netgear RAXE500 https://www.netgear.com/support/product/raxe500.aspx and tried to set up port forwarding like I did with my old router, but status shows Not Available.

My ISP is Aussie Broadband NBN HFC.   Do I need to purchase static IP add-on from ISP to use port forwarding feature?

[PGalore · Accepted solution]

I found the solution. 

My ISP is using CGNAT. https://www.aussiebroadband.com.au/help-centre/internet/tech-support/cg-nat/

I called them and asked to opt out of it.