Is Quantum Fiber using CGNAT now?

Up until last week, my Quantum Fiber account was still set up as a legacy CenturyLink account with PPPoE. I had a tech come out last week because of repairs that needed to be made to the fiber line behind my house and he updated the service to whatever AT&T is doing now, as well as switched out my old Calix ONT for a Q1000K.

Anyway, so here's my problem. I have a wireguard server running on my local network that I use to access my machines at home when I'm away. I have port forwarding set up in OPNsense, but am no longer able to access my home network. Here is what I'm seeing that makes me thing I'm behind CGNAT. In OPNsense, under Gateways, I'm seeing that WAN_DHCP has an address of 174.29.x.x, whereas any of my devices that I log into will show a DIFFERENT address that ALSO starts with 174.29.x.x when visiting ip-tracker.org. My Q1000K is set to transparent bridging mode with VLAN tagging set to 201. I couldn't get VLAN tagging to work in opnsense, which is why I left it on in the Q1000K.

After searching around, I haven't found anyone saying that they are behind CGNAT on Quantum Fiber, nor have I seen that any common CGNAT addresses start with 174.x.x.x, so I'm wondering if I could have configured something wrong in opnsense or if this is a new thing. I chatted with QF support to see if they could confirm whether I was behind CGNAT or not and they had no idea what I was talking about. So any guidance would be very helpful, thank you!

Posted Jul 13, 2026, 4:23 PM UTC

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