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Initial revision
A tunnel connecting the subnets behind the gateways <b>moon</b> and <b>sun</b>, respectively, is automatically established by means of the setting <b>auto=start</b> in ipsec.conf. The connection is tested by client <b>alice</b> behind gateway <b>moon</b> pinging the client <b>bob</b> located behind gateway <b>sun</b>. The updown script automatically inserts iptables-based firewall rules that let pass the tunneled traffic.