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At least two NICs on each node. One for management network one for endpoint of VXLAN tunnel.
It's better to have 3 NICS on Network Node for splitting public and management networks.
NTP is required to sync nodes ( service should be installed on each one)

At least two NICs on each node. One for management network one for endpoint of VXLAN tunnel.
It's better to have 3 NICS on Network Node for splitting public and management networks.
NTP is required to sync nodes ( service should be installed on each one)
If your boxes have just one NIC it may used for both purposes, but you will experience performance degradation.