I decided to revisit my setup for watching Japanese TV. So far I've been using Wireguard on a Netgear R6220 which has OpenWrt installed; but I want to give OPNsense a try. This will be on a little Protectli Vault FW4C appliance. Most of the tedious steps to retrieve the NordVPN configuration remains valid.
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Fixing an ISA 3Com EtherLink III 3C509B
I had the misfortune of plugging this card halfway without realizing it, and to launch 3C5X9CFG to change its base address and IRQ. While flashing seemed OK, the card would then fail the EEPROM Vital Data Test, meaning corrupted EEPROM content, and a card that would no longer work properly. The EEPROM not only stores the current configuration but also more "vital" information such as MAC Address, manufacturing date, model, etc...