![bia mac address bia mac address](http://etutorials.org/shared/images/tutorials/tutorial_59/05fig01.gif)
If set to “Accept,” the VM can put in any MAC address it wishes into the “source address” field of a Layer 2 frame. Very similar to the MAC Address Changes policy, the Forged Transmits policy is concerned with MAC Address Changes, but only as it concerns transmitting traffic. To sum it up, the MAC Address Changes policy is focused entirely on whether or not a VM (or even a VMkernel port) is allowed to change the MAC address it uses for receiving traffic. The port will no longer receive traffic until you either change the security policy or make sure that the Effective MAC address is the same value as the Initial MAC address. When set to “Reject,” the vSwitch will disable the port if it sees that the guest OS is trying to change the Effective MAC address to something other than the Initial MAC address. Typically, we don’t want this to happen as a malicious user could try to impersonate another VM by using the same MAC address, but there are use cases, such as with Microsoft Network Load Balancing (NLB) where it makes sense. When set to “Accept,” the vSwitch allows the Initial MAC address to differ from the Effective MAC address, meaning the guest OS has been allowed to change the MAC address for itself. So, now that you’re a MAC address expert, let’s go back in and discuss how the vSwitch polices MAC Address Changes. The Runtime MAC address is the actual live address that is being seen by the vSwitch port.įigure 8.3 shows the Runtime MAC address of a VM in the vSphere Web Client.įigure 8.3 The Runtime MAC address of a VM.
#BIA MAC ADDRESS PC#
Typically, the guest OS just uses the Initial MAC address, much like your PC will by default use the BIA or your NIC. The Effective MAC address is configured within the VM by the guest operating system (OS).It is very similar to a physical NIC’s burned-in address (BIA). This is something you either let vSphere decide for you when the virtual NIC is created or manually set yourself by changing that vSphere-provided value. The Initial MAC address is configured on the virtual network adapter inside the VM.To begin with, every VM has three different types of MAC addresses: the Initial, Effective, and Runtime MAC addresses: First, what exactly is a MAC Address Change from a vSwitch perspective? To understand this, you must first know more about how the switch keeps track of MAC addresses for VMs. The idea of MAC Address Changes tends to confuse a lot of people, so we’ll go deep into this one.
![bia mac address bia mac address](https://mir-s3-cdn-cf.behance.net/project_modules/fs/e859c356245649.59a7d4316a4dc.jpg)
It can still only see traffic for the VLAN(s) that it belongs to. Promiscuous mode does not allow a VM to see traffic on VLANs that aren’t specified by the port group.