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Strongswan

A connection between the subnets behind the gateways <b>moon</b> and <b>sun</b>
is set up using XFRM interfaces.
<p/>
The gateways use <b>route-based forwarding</b> with <b>XFRM interfaces</b>, with
firewall rules to allow traffic to pass. The IPsec traffic selector used is
0.0.0.0/0, however, specific routing is achieved with routes on the XFRM
interfaces. The IKE daemon does not install routes for CHILD_SAs with outbound
interface ID, so static routes are installed for the target subnets.
<p/>
Both gateways use separate interfaces for in- and outbound traffic (which is
completely optional and mainly for testing purposes, a single interface will
usually be enough). Gateway <b>moon</b> creates them before initiating the
connection, while gateway <b>sun</b> dynamically creates the interfaces via
updown script using the passed unique generated interface IDs.
<p/>
Client <b>alice</b> behind gateway <b>moon</b> pings client <b>bob</b> located
behind gateway <b>sun</b>.