- The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each
- to the virtual gateway <b>mars</b> implemented by the two real gateways
- <b>alice</b> and <b>moon</b> in a <b>High Availability</b> (HA) setup
- based on <b>ClusterIP</b>. The HA synchronisation link between the two
- gatways is secured by an IPsec transport connection. At the outset
- <b>alice</b> is the active and <b>moon</b> is the passive gateway.
- After <b>alice</b> gets killed <b>moon</b> automatically takes over
- all existing IKE_SAs and CHILD_SAs.
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