Ubiquiti AirMax

Charter has been quietly rolling out MAP-T. It’s a little different than CGNAT but still involves multiple customers sharing an IPv4 address. However the customers are sharing a standard public address not sharing in the 100.x.x.x range. https://pc.nanog.org/static/published/meetings/NANOG71/1452/20171004_Gottlieb_Mapping_Of_Address_v1.pdf

You will see other ISPs worldwide rolling out CGNAT or MAP-T as well. They are all out of IPv4 addresses or close.

As you say you can do VPN based port forwarding. Wireguard / Tailscale work fine behind MAP-T. Or, just use standard IPv6.

I like the SB8200… no issues with the SB8300 I just don’t know what chipset it uses.

But either way, you really need DOCSIS 3.1. OFDM is a game changer and it’s only a matter of time before D3.0 devices are kicked off the network. It’s shameful that you can still buy them.

OFDM has much higher spectral density. That is, it packs more speed into the same spectrum. As operators increase network speeds, they are allocating more to OFDM and it’s upstream cousin OFDMA, and less toward its D3.0 predecessor SC-QAM.