Heartbeat - How IP Aliasing works

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http://nixcraft.com – Hi, I recently setup a linux cluster using heartbeat with 2 nodes. On the primary node I configured an IP alias interface eth0:0. When I shutdown heartbeat services on the primary node, this interface shuts down and starts up on the secondary node. Can anyone explain to me how this works, or point me to documentation regarding IP Aliasing with heartbeat? Thanks (HowTos)