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- The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each
- to gateway <b>moon</b>. The authentication is based on distinct <b>pre-shared keys</b>
- and IPv4 addresses. Upon the successful establishment of the IPsec tunnels,
- automatically inserted iptables-based firewall rules 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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