To enable VMAC mode on a cluster member, you need to set the value of the global kernel parameter fwha_vmac_global_param_enabled to 1. This can be done on-the-fly using the command fw ctl set int fwha_vmac_global_param_enabled 1 on all cluster members. This command does not require a reboot or a policy installation. VMAC mode allows the cluster to use a virtual MAC address for its virtual IP addresses, which reduces the number of gratuitous ARP packets sent upon failover and avoids ARP cache issues on some routers and switches. References: How to enable ClusterXL Virtual MAC (VMAC) mode
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