Topology:
```
	     infrastructure  	 services
	    +---------------+ 	+---------------+	

		 ns					 ssh

	>--- gate				 openvpn

		 proxy				 nextcloud

							 ...
```


Options:
- `CT_GROUP=1000`
- `CT_INFRASTRUCTURE=(100 .. 199)`
- `CT_SERVICES=(200 .. 299)`
- `CT_TEMPLATES=(900 .. 999)`

- `WAN=vmbr2`
- `LAN=vmbr0`
- `NET=10.0.0.0/24`
- `DHCP=(10.0.0.10 .. 10.0.0.200)`




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