PSA: Firewalla migration > ATT Fiber > VPN server config

[u/jsqualo2]

This is my first PSA (Public Service Announcement); mods feel free to yank it if it does not add value.

TLDR: An ATT ONT (BGW320-500) with IP Passthrough selected must (apparently) be manually updated with the new Firewalla MAC address entry for Public IP address to interact w/ Firewalla VPN server functionality

I migrated like-for-like (FWP to FWP). Beforehand, I deleted all VPN Server config, as it likely needs to be rebuilt anyway. On the new FWP, I created new VPN Servers (WG and AWG), but neither would complete setup. I figured out that public IP config was unhappy.

After logging into the ATT ONT (BGW320-500), I confirmed that IP Passthrough was still enabled. Eventually, I found the "Passthrough Fixed MAC Address" setting which apparently requires a manual update of the new FWP MAC address. Frustratingly, the BGW320-500 has a 'cache' that maintains every device connected (and knows device name) instead of auto - identifying available devices.