That's highly unlikely because if that was the case the cluster could never work. I verified is, and omping works:
xxx.xxx.xxx.108 : unicast, seq=1, size=69 bytes, dist=0, time=0.123ms
xxx.xxx.xxx.108 : multicast, seq=1, size=69 bytes, dist=0, time=0.138ms
xxx.xxx.xxx.108 : unicast, seq=2...