| A connection between the subnets behind the gateways <b>moon</b> and <b>sun</b> is set up. |
| The authentication is based on <b>X.509 certificates</b> and the <b>kernel-libipsec</b> |
| plugin is used for userland IPsec ESP encryption. The negotiated encryption and authentication |
| algorithms are <b>NULL</b> and <b>SHA-256</b>, respectively.<br/> |
| Just by way of example, <b>NULL</b> encryption is also configured for the IKEv2 connection, |
| using the NULL-crypter provided by the OpenSSL library. |
| <p/> |
| Upon the successful establishment of the IPsec tunnel, an updown script automatically |
| inserts iptables-based firewall rules that let pass the traffic tunneled via the |
| <b>ipsec0</b> tun interface. 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>. |
