I have set up OpenVPN server and client as described in the official how to, using routing/tun devices. Point to point connection works. The client correctly routes all traffic into the VPN. Nothing comes back even though I did
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE
on the server like instructed in the how to. What is the problem?
The how to doesn't mention one additional required step on the server, but a FAQ entry does. In addition,
echo 1 > /proc/sys/net/ipv4/ip_forward
is needed to make it work. To make this permanent, add
net.ipv4.ip_forward = 1
to /etc/sysctl.conf.
To verify that this worked, run
sysctl net.ipv4.ip_forward
. If this does not return net.ipv4.ip_forward=1 then there is a problem.