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- A connection between the subnets behind the gateways <b>moon</b> and <b>sun</b>
- is set up using childless initiation of IKEv2 SAs (RFC 6023).
- <p/>
- The IKE_SA is established without CHILD_SA during IKE_AUTH. Instead, the
- CHILD_SA is created right afterwards with a CREATE_CHILD_SA exchange, allowing
- the use of a separate DH exchange for the first CHILD_SA, which is not possible
- if it is created during IKE_AUTH.
- <p/>
- The authentication is based on <b>X.509 certificates</b>. Upon the successful
- establishment of the IPsec tunnel, the updown script automatically
- inserts iptables-based firewall rules that let pass the tunneled traffic.
- In order to test both tunnel and firewall, client <b>alice</b> behind gateway
- <b>moon</b> pings client <b>bob</b> located behind gateway <b>sun</b>.
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