Example Configuration, if you have direct connection to your peer

Replace <PEER_NAME> with a self chosen name to identify this peer
Replace <PROTO> with either udp or udp6, depending if you reach your remote peer with ipv4 o ipv6
Replace <REMOTE_HOST> with the public ip address of your peer
Replace <REMOTE_PORT> with the port number, where your peer's openvpn daemon listen for traffic
Replace <LOCAL_HOST> with your public ip
Replace <INTERFACE_NAME> with a self chosen name, this will be the name of your network interface (tun device) for this peering
Replace <LOCAL_GATEWAY_IP> with your own dn42 ip address
Replace <REMOTE_GATEWAY_IP> with dn42 ip address of your peer

#/etc/openvpn/<PEER_NAME>
daemon
proto       <PROTO>
mode        p2p
remote      <REMOTE_HOST>
rport       <REMOTE_PORT>
local       <LOCAL_HOST>
lport       <LOCAL_PORT>
dev-type    tun
dev         <INTERFACE_NAME>
comp-lzo
persist-key
persist-tun
ifconfig    <LOCAL_GATEWAY_IP>  <REMOTE_GATEWAY_IP>
secret /etc/openvpn/<PEER_NAME>.key

then create a new key and share it with your peer

$ openvpn --genkey --secret /etc/openvpn/<PEER_NAME>.key

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howto/openvpn

Example Configuration, if you have direct connection to your peer