How do I change the TTL on multicast packets in a RHEL 6 cluster?

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Issue

How can I change the TTL on multicast packets in a RHEL 6 cluster?
How do we change TTL in the CMAN cluster.conf. (We use CMAN, so the corosync parameters have to be set in the cluster.conf).

Environment

Red Hat Enterprise Linux (RHEL) 6 with the High Availability Add On
cman

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