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The roadwarrior <b>carol</b> and the gateway <b>moon</b> use the <b>Crypto API</b>
of the Linux kernel via the <b>af_alg</b> userland interface for all symmetric
encryption and hash functions whereas roadwarrior <b>dave</b> uses the default
<b>strongSwan</b> cryptographical plugins <b>aes des sha1 sha2 md5 gmp</b>.
<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>.
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>.
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