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Part of the RC shutdown scripts shuts down all network
interfaces. The ICS interface should silently refuse to
go down. The shutdown script will continue merrily on
its way, and the node can still talk to the cluster
while it finishes going down.
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Back in the old (pre-open source) days, we added a "belongs
to ICS" flag to the interface flags and set it during ICS
initialization. Later during shutdown, if that flag was set
we would skip the interface.
You probably want to do something like that here.