![]() Other cases revolve around the concept of utilizing a common MAC address to own a cluster resource when one or more nodes fail. In this scenario, multiple virtual machines are participating in the NLB cluster and all have the same MAC address. ![]() ![]() The host compares the Effective Address to the 802.3 Source Address generated by the virtual machine When Does A Forged Transmit Make Sense?Ī common poster child for Forged Transmits is the use of Microsoft’s Network Load Balancing (NLB) unicast mode configuration. The policy does not compare the virtual machine’s configured MAC address, also called the Initial Address, as that duty is handled by the MAC Address Changes policy. The key thing to note about Forged Transmits is that the security policy is only policing the Effective Address of the network adapter, which is the address set by the guest OS. If the security policy for Forged Transmits is set to Reject, the frame will be dropped. If they don’t match, a Forged Transmit has occurred – sometimes this is known as MAC impersonation. To simplify the idea behind the policy, a Forged Transmit occurs when a network adapter starts sending out traffic that identifies itself as someone else. This security policy compares the Effective Address of the virtual network adapter and the source address inside of an 802.3 Ethernet frame generated by the virtual machine to make sure they match. ![]() One virtual switch security policy that tends to trip folks up is the idea of rejecting or accepting MAC address Forged Transmits. ![]()
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