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Do both VMs use the same portgroup? Do they run on the same hypervisor or on different?
Specifically make a port groups for interfaces with carp.
- Enable promiscuous mode
- Enable MAC Address changes
- Enable Forged transmits
- If multiple physical ports exist on the same vswitch, the Net.ReversePathFwdCheckPromisc option must be enabled to work around a vswitch bug where multicast traffic will loop back to the host, causing CARP to not function
[although I thought it was Net.ReversePathFwdCheck that had to be set]