| A connection between the subnets behind the gateways <b>moon</b> and <b>sun</b> is set up. | |
| The authentication is based on <b>Preshared Keys</b> (PSK). | |
| <p/> | |
| Upon the successful establishment of the IPsec tunnel, <b>leftfirewall=yes</b> automatically | |
| inserts iptables-based firewall rules that let pass the tunneled traffic. | |
| In order to test both tunnel and firewall, client <b>alice</b> behind gateway <b>moon</b> | |
| pings client <b>bob</b> located behind gateway <b>sun</b>. |