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- 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.
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