The VM-Series firewall supports the ability to detect the MAC address assigned to the physical interface by the host/hypervisor and use that MAC address on the VM-Series firewall deployed with Layer 3 interfaces. The firewall can then use the hypervisor assigned MAC address in its ARP responses. This capability allows non-learning switches, such as the VMware vSwitch to forward traffic to the dataplane interface on the firewall without requiring that promiscuous mode be enabled on the vSwitch. If neither promiscuous mode nor the use of hypervisor assigned MAC address is enabled, the host will drop the frame when it detects a mismatch between the destination MAC address for an interface and the host-assigned MAC address. IPv6 Address on an Interface —In an active/passive, Layer 3 interfaces using IPv6 addresses must not use the EUI-64 generated address as the interface identifier (Interface ID).
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Because the EUI-64 uses the 48-bit MAC address of the interface to derive the IPv6 address for the interface, the IP address is not static. This results in a change in the IP address for the HA peer when the hardware hosting the VM-Series firewall changes on failover, and leads to an HA failure. Lease on an IP Address —When the MAC address changes, DHCP client, DHCP relay and PPPoE interfaces might release the IP address because the original IP address lease could terminate. MAC address and Gratuitous ARP —VM-Series firewalls with hypervisor assigned MAC addresses in a high-availability configuration behave differently than the hardware appliances with respect to MAC addressing. Hardware firewalls use self-generated floating MAC addresses between devices in an HA pair, and the unique MAC address used on each dataplane interface (say eth 1/1) is replaced with a virtual MAC address that is common to the dataplane interface on both HA peers. When you enable the use of the hypervisor assigned MAC address on the VM-Series firewall in HA, the virtual MAC address is not used.