The roadwarrior <b>carol</b> and the gateway <b>moon</b> use the <b>openssl</b> plugin based on the <b>OpenSSL</b> library for all cryptographical and X.509 certificate functions whereas roadwarrior <b>dave</b> uses the default <b>strongSwan</b> cryptographical plugins <b>aes des sha1 sha2 md5 gmp x509</b> plus the <b>openssl</b> plugin for the Elliptic Curve Diffie-Hellman groups only. <p> The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each to gateway <b>moon</b>. The authentication is based on <b>X.509 certificates</b>. <b>carol</b> proposes the DH groups ECP_256 and ECP_384 whereas <b>dave</b> proposes ECP_256 and ECP_521. Since <b>moon</b> does not support ECP_256 the roadwarriors fall back to ECP_384 and ECP_521, respectively. <p> Upon the successful establishment of the IPsec tunnels, <b>leftfirewall=yes</b> automatically inserts iptables-based firewall rules that let pass the tunneled traffic. In order to test both tunnel and firewall, both <b>carol</b> and <b>dave</b> ping the client <b>alice</b> behind the gateway <b>moon</b>.