I'm told that an interface can transmit a frame no matter what the OS has set for the interface's MAC. I'm also under the impression this is how VMs do host-bridging. If that is so, then what uses the interfaces bound MAC address?
Specifically, I'm asking about the software MAC not the MAcs that were burned into the ROM in the 70s:
wlan0 Link encap:Ethernet HWaddr 00:16:ce:01:
That is a line of output from
ifconfig, but I'm told the interface wlan0 can transmit under /any/ MAC address, and that MAC I'm seeing does nothing at all (except maybe provide a default for some libraries). I'm told that with a VM's host-bridging it will exploit that, and transmit on an arbitrary amount of ip address - but that it doesn't stop there the AP will actually permit you to assign a unique IP to each one of those VMs, because the AP will receive the requests on different MACs.
- Do you have any special permissions (linux) to craft a packet from a "virtual" MAC address.
- If a MAC address is how a router tracks what interface, and host, has whatever IP, then how do you stop one host from request all of the IPs to virtual interfaces
- How do you stop users from using virtual MAC addresses
- Does this require a special option in the kernel or piece to built in the network stack?