What is the proper way to simulate a network failure on a RHEL Cluster? - Red Hat Customer Portal

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Issue

What is the proper way to simulate a network failure on a RHEL Cluster?
Is doing an ifdown and ifup a proper way to simulate that the network is down on the heartbeat network for a RHEL cluster node?
Why didn't my service group failover when I performed an ifdown on the heartbeat interface?

Environment

Red Hat Enterprise Linux Server 5 (with the High Availability Add on)
Red Hat Enterprise Linux Server 6 (with the High Availability Add on)
Red Hat Enterprise Linux Server 7 (with the High Availability Add on)

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