open VPN Client with firewall-start iptables problem

[trollmari]

Hi,
i use the VPN service with AirVPN and the Asus68ac (merlin firmware).
Client works... no problem.

Now I would like to open a port to specific destination inside my LAN.

So here what i do:
1. Run AirVPN Service with the AC68u..worked
2.configured my Forwarding rules at Airvpn.org Port: 10024. ...workded
3. Configured my firewall-start script with this Iptables rules:

iptables -I FORWARD -i tun11 -p udp -d 192.168.1.130 --dport 10024 -j ACCEPT
iptables -I FORWARD -i tun11 -p tcp -d 192.168.1.130 --dport 10024 -j ACCEPT
iptables -t nat -I PREROUTING -i tun11 -p tcp --dport 10024 -j DNAT --to-destination 192.168.1.130
iptables -t nat -I PREROUTING -i tun11 -p udp --dport 10024 -j DNAT --to destination 192.168.1.130

..worked. but not as aspected!!
My Problem:
The Port 10024 is now open to all my devices inside my LAN.

I would like to open the port only to 192.168.1.130

Whats wrong with my iptables rules?
Greetz