Name of the tun interface when running openvpn?

You can give the tun device name in the .ovpn configuration file:

Edit the file /etc/openvpn/server-vpngw.conf and add such lines:

dev tun3
client-config-dir /etc/openvpn/ccd

Then create the following file /etc/openvpn/ccd/vpn-name and edit it like so:

ifconfig-push 10.8.2.202 10.8.2.201
push "route 172.16.12.0 255.255.255.0"
push "route 10.2.4.0 255.255.255.0"

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