The roadwarrior <b>carol</b> sets up a connection to gateway <b>moon</b>. The authentication is
based on <b>Preshared Keys</b> (PSK) and <b>IPv4 addresses</b> (ID_IPV4_ADDR).
<b>firewall=yes</b> automatically inserts iptables-based firewall rules that let pass
the tunneled traffic. In order to test the tunnel <b>carol</b> pings the client <b>alice</b>
behind the gateway <b>moon</b>.
