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Strongswan
An IPv6 ESP tunnel connection between the gateways <b>moon</b> and <b>sun</b> is successfully set up. It connects the two IPv4 subnets hiding behind their respective gateways. The authentication is based on X.509 certificates. In order to test the IPv4-over-IPv6 ESP tunnel, client <b>alice</b> behind <b>moon</b> sends an IPv4 ICMP request to client <b>bob</b> behind <b>sun</b> using the ping command.