Proxmox All-in-One

pfSense

• Install pfSense (a link)
  • Set up a second network bridge internally (& give it a secondary physical NIC if you have one)
  • Build the pfSense VM
    • 8GB drive, 4 cores, 4096MB RAM
    • Add a second network device (on the second bridge... duh...)
  • Do a BACKUP
  • boot the VM & run through the defaults
  • Do a BACKUP
  • Open the VM console & pretend you're building a normal pfSense router

Management VM

• Pick your favourite OS & build a VM
  • Point its network device at the second network bridge
  • Sign into https://192.168.1.1 (from the Nanagement VM)
  • Go into Services / DHCP Server / LAN
    • Under Servers, add in your DNS server(s) address(es)
  • Feed access to this VM through the pfSense firewall
• & continue messing with pfSense

Or... Ya know... Since ya gave that second network bridge a physical NIC (Ya did, right?)... You could just plug a computer in there.