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Added some extra text and an example

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In a discussion on Qubes OS forum, it was decided that I should add some extra text about the netmask, and an example  for Network Manager. The purpose being to make the procedure much clearer.

There are two images to go into the text, but I don't understand how to do that yet. I have used '>' at those points. Please advise.

Francis.
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@ -175,11 +175,38 @@ seen, e.g., in the Qube Manager in the qube's properties:
![r4.0-manager-networking-config.png](/attachment/doc/r4.0-manager-networking-config.png)
Alternatively, one can use the `qvm-ls -n` command to obtain the same
information (IP/netmask/gateway).
information (IP/netmask/gateway). The netmask required is that for your own network,
so for example, if your IPv4 network has a subnet mask of /24 then the actual netmask to
use is 255.255.255.0 - even if the Qube Manager suggests 255.255.255.255
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.
### 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 hopefully a worked example will
prove useful. The worked example is for a HVM running EndeavourOS.
> Image of Qubes Manager - is this what it's called??
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 255.255.255.255 (but in the network the netmask is actually 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
The network was set up by entering Network Manager, tab Wi-Fi & Networking, clicking on the Wired Ethernet
item, and selecting tab IPv4 (1). The Manual method is selected (2), which reveals areas for data entry. The DNS
Servers takes a comma-separated list, here 10.139.1.1,10.1.139.2 (3). At the bottom of the tab (4), click on '+ Add',
and enter the IP address of 10.137.0.17 under column 'Address', the Netmask of 25.255.255.0 (to match the network)
under column 'Netmask', and the Gateway of 10.138.24.248 under column 'Gateway'. Apply these changes.
## Using template-based HVMs
Qubes allows HVMs to share a common root filesystem from a select template.