Microsoft’s Wolverine for the TCP stack was not available until Windows 3.11. An argument could be made that these systems are defacto air-gapped as they cannot communicate with modern networking.
I have that exact machine in my electronics “graveyard”.
Peppermint OS was my GO-TO for speed and driver support out of the box. You can also stick in a 2GB SODIMM of ram. It will only recognize 1.5GB but still 50% more ram.
J1900 has no hardware switch. Every packet goes through CPU, so even LAN to LAN uses processing power. Add pfsense to the mix and it’s probably choking.
A fathers day card from the dollar store. Include a gift card from the same dollar store. Put no money on the gift card.
TNG, The Drumhead. The social commentary aspect of Trek without being too heavy on needing to know the SciFi lore of the series.
The People Under the Stairs Army of Darkness Maximum Overdrive
All great campy flicks.