Kali/OpenVPN/Hotspot

This page covers how to connect a wifi hotspot created with hostapd with an OpenVPN connection with Kali Linux

This approach uses iptables

Setup

Set up the hotspot as described at Kali/Hotspot, but skip the iptables commands, we'll run some different ones

Set up the OpenVPN connection, which will create an interface like tun0 or tun1 (we will use tun1)

We will modify the iptables rules from Kali/Hotspot to target the tun1 interface instead of the wlan2 interface.

# flush the tables
iptables -t nat -F
iptables -F

# add a postrouting rule to specify a mapping to an outgoing interface
iptables -t nat -A POSTROUTING -o tun1 -j MASQUERADE

# forward packets from wlan1 to tun1
iptables -A FORWARD -i wlan1 -o tun1 -j ACCEPT

# enable ipv4 forwarding
echo '1' > /proc/sys/net/ipv4/ip_forward