I have AT&T Uverse as my internet provider and am forced to use their gateway which also has a router built in. Last weekend, I added a Netgear Nighthawk AC2300 behind the AT&T gateway & 99.99% of my internet activity works except DuckDNS. I have done the following:
- removed any Hassio port forwarding from ATT gateway & added to the Netgear router. Turned off gateway WiFi.
- put AT&T gateway in “DMZplus mode”, which is the closest the gateway has to bridge mode & select the Netgear router as the device. It reports all applications, ports & protocols are being sent to the netgear router.
- Public IP on gateway matches what netgear says is it’s IP address & this also matches what DuckDNS website says is my current IP.
- removed port fowarding on netgear router & tried all combinations of 443 & 8123 on the external & internal ports.
- uninstalled DuckDNS & reinstalled with same config.
- DuckDNS logs are clean/green & reports same IP as the DuckDNS website, gateway & router.
- Hassio/Supervisor logs are clean/green too.
Luckily, I can still access my Hassio instance with hassio.local & Nabu Casa cloud on Win 10 chrome browser, & both the iOS & Android HA app (local & remote). But, I can’t get DuckDNS to work. Does anybody have any suggestions?
Thank you.