The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each
to gateway <b>moon</b>. The roadwarriors' authentication is based on
<ib>Pre-Shared Keys</b> (PSK) whereas the gateway uses an <b>Public key signature</b>
(Pubkey) certified by an X.509 certificate.
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Upon the successful establishment of the IPsec tunnels, the updown-script 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>.