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Strongswan
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, 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>.