Network state refers to instance IP addresses and active security group
rules (user defined instance network ingress policies).  It is important
to be able to maintain this state in the following scenario:

Eucalyptus is up and running
Users are running VMs and logging in/accessing them via the network
The machine on which the CC is running fails or reboots

Currently, if this happens, all currently running VMs will lose network
connectivity when the CC state is cleared.  If the files in
'/var/lib/eucalyptus/CC' are not removed, then the CC will restore the
system's network state when the machine comes back and the CC is
restarted.  Otherwise, all instances will need to be terminated and
restarted.

This issue arises when Eucalyptus is in MANAGED, MANAGED-NOVLAN, and
STATIC networking modes.

-- 
network state is lost if the cluster controller (CC) is stopped
https://bugs.launchpad.net/bugs/460089
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