[Unit]
Description=Proxy loopback NATS onto vmbr1 (10.10.10.1:4222) for Proxmox guests
After=network.target

[Service]
Type=simple
# Public NIC must stay unbound. Loopback NATS remains 127.0.0.1:4222.
ExecStart=/usr/bin/socat TCP-LISTEN:4222,bind=10.10.10.1,reuseaddr,fork TCP:127.0.0.1:4222
Restart=always
RestartSec=2

[Install]
WantedBy=multi-user.target