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Add worked example of setting network in HVM

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@ -191,9 +191,40 @@ seen, e.g., in the Qube Manager in the qube's properties:
Alternatively, one can use the `qvm-ls -n` command to obtain the same
information (IP/netmask/gateway).
The Qube Settimgs shows a netmask of 255.255.255.255.
This is not suitable for most standalones, and you will need to use a different value.
The DNS IP addresses are `10.139.1.1` and `10.139.1.2`. There is [opt-in
support](/doc/networking/#ipv6) for IPv6 forwarding.
In Qubes, the IP address is usually in range 10.137.0.0/16, with disposables in range 10.138.0.0/16, and DNS set to `10.139.1.1` and `10.139.1.2`.
The simplest solution is to set the netmask to 255.0.0.0 - standard for a class A network.
If you want a more restricted solution you could use 255.252.0.0, or 255.255.255.0
There is [opt-in support](/doc/networking/#ipv6) for IPv6 forwarding.
### An example of setting up a network - Network Manager on KDE
Every guest operating system has its own way of handling networking, and the user is
referred to the documentation that comes with that operating system. However,
Network Manager is widely used on Linux systems, and so a worked example will
prove useful. This example is for an HVM running EndeavourOS.
![Image of Qube Settings](/attachment/doc/EndeavourOS_Network.png "Qube Settings")
In this example, Network Manager on KDE, the network had the following values:
1. IPv4 networking
2. IP address 10.137.0.17
3. Netmask - qube settings showed 255.255.255.255, but we decided to use 255.255.255.0
4. Gateway 10.138.24.248
5. Virtual DNS 10.139.1.1 and 10.139.1.2
![Image of Network Manager, annotated by numbers for reference below](/attachment/doc/Network Manager.png "Annotated image of KDE Network Manager")
The network was set up by entering Network Manager, selecting the Wi-Fi & Networking tab, clicking on the Wired Ethernet
item, and selecting tab IPv4 (1).
The Manual method was selected (2), which revealed areas for data entry.
The DNS Servers section takes a comma-separated list, here 10.139.1.1,10.1.139.2 (3).
At the bottom of the tab (4), the '+ Add' button was selected, and the IP address of 10.137.0.17 entered in the 'Address' column, the Netmask of 255.255.255.0 entered in the 'Netmask' column, and the Gateway of 10.138.24.248 under 'Gateway'.
Selecting the "Apply" button stored these changes
## Using template-based HVMs