edit /etc/openvpn/server.conf
CENTOS X64
# Username and Password authentication.
client-cert-not-required
plugin /usr/lib64/openvpn/plugin/lib/openvpn-auth-pam.so login
RASPBERRY
# Username and Password authentication.
client-cert-not-required
plugin /usr/lib/openvpn/openvpn-auth-pam.so login
Also script for firewall
cat firewall-openvpn-rules.sh
#!/bin/sh
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j SNAT --to-source 11.22.33.44
11.22.33.44 you RPI address
Add pre-up /etc/firewall-openvpn-rules.sh We want to add a line below it at an indent. So this is what the two lines, existing and new, will look like when you’re done:
# cat /etc/network/interfaces
auto lo
iface lo inet loopback
iface eth0 inet dhcp
pre-up /etc/firewall-openvpn-rules.sh
allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp