README.md: add some explanation

Signed-off-by: Angelo Failla <[email protected]>

Author: pallotron

README.md

@@ -351,6 +351,12 @@ sudo launchctl bootout system /Library/LaunchDaemons/io.github.lima-vm.socket_vm
 sudo rm /Library/LaunchDaemons/io.github.lima-vm.socket_vmnet.bridged.${BRIDGED}.plist
 ```
 
+### No DHCP mode
+
+By passing `--vmnet-network-uuid=<UUID>` and `--vmnet-mode=host` to `socket_vmnet`, the internal DHCP will be disabled.
+This is useful for situations where the users want to create a network with statically assigned IP addresses or where another VMs is running its own DHCP server.
+This mode does not come with a launchd service.
+
 ## FAQs
 
 ### Why does `socket_vmnet` require root?
@@ -387,13 +393,20 @@ On the other hand, `socket_vmnet` does not require the entire QEMU process to ru
 
 ### How to use static IP addresses?
 
+Two options:
+
+#### By using a shorter DHCP range
 When `--vmnet-gateway=IP` is set to "192.168.105.1", the whole subnet (192.168.105.2-192.168.105.254) is used as the DHCP range.
 
 To use static IP addresses, limit the DHCP range with `--vmnet-dhcp-end=IP`.
 
 For example, `--vmnet-gateway=192.168.105.1 --vmnet-dhcp-end=192.168.105.100` allows using `192.168.105.101-192.168.105.254`
 as non-DHCP static addresses.
 
+#### By setting up network UUID (only in vmnet.host mode)
+
+When `--vmnet-mode=host` and `--vmnet-network-uuid` are set, the internal DHCP is disabled and you are free to use static IP addresses. You still need to set `--vmnet-gateway=IP` to avoid collision with other vmnet networks.
+
 ### How to reserve DHCP addresses?
 
 - Decide a unique MAC address for the VM, e.g. `de:ad:be:ef:00:01`.