ping node

[needee]

Ping nodes are usually used to determine the network connectivity to the User LAN. Therefore the ping nodes
should be realistic points in the network, that reflect the accessibility of a cluster node by end users.
If all ping nodes are not reachable by a cluster node (i.e., in case of a network failure), appropriate location rules make sure, that resources are moved to the other cluster node. If both nodes are losing the network connectivity, the controlled resources can't run on any node.

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