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Update firewall.md - Network service qubes

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@ -99,6 +99,21 @@ default Qubes installation):
` qvm-prefs sys-firewall -s netvm sys-net `
Network service qubes
--------------------------------------
Qubes does not support running any networking services (e.g. VPN, local DNS server, IPS, ...) directly in a qube that is used to run the Qubes firewall service (usually sys-firewall) and will never do so for good reasons. In particular if one wants to ensure proper functioning of the Qubes firewall one should not not tinker with iptables or nftables rules in such qubes.
Instead, one should deploy a network infrastructure such as
~~~
sys-net <--> sys-firewall-1 <--> network service qube <--> sys-firewall-2 <--> [client qubes]
~~~
Thereby sys-firewall-1 is only needed if one has client qubes connected there as well or wants to manage the traffic of the local network service qube. The sys-firewall-2 proxy ensures that:
1. Firewall changes done in the network service qube cannot render the Qubes firewall ineffective.
1. Changes to the Qubes firewall by the Qubes maintainers cannot lead to unwanted information leakage in combination with user rules deployed in the network service qube.
1. A compromise of the network service qube does not compromise the Qubes firewall.
For the VPN service please also have a look at the [VPN documentation](/doc/vpn).
Enabling networking between two qubes
--------------------------------------