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Port forwarding to VPN Client

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Hello everybody,

I have a doubt in forwarding the traffic of a software port with destination to a VPN Client (sorry for the noob question).

I found these commands, but I wanted to know if it's the right/safe thing to do.

iptables -t nat -A PREROUTING -i INTERFACE -p udp --dport PORT -j DNAT --to-destination IP_ADDRESS
iptables -t nat -A PREROUTING -i INTERFACE -p tcp --dport PORT -j DNAT --to-destination IP_ADDRESS

INTERFACE = tun13 (eg. interface 3 of OpenVPN Client)
PORT = 3440 (eg. port defined in software)
IP_ADDRESS = (eg. IP of device where installed the software)

If this port is already defined in the GUI (WAN --> Virtual Server / Port Forwarding), it would be better to remove it, correct?

Finally, if the Killswitch option is enable on the VPN Client, will traffic be blocked if the VPN connection fails?




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