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I have a very specific networking issue on a dedicated Linux server (op.system is Debian 6).
Here is the problem description:
The physical Linux server is located in a hosting facility. This ISP gave me multiple dedicated IP addresses which I can assign to my Linux server and they work just fine.
However, their network switch is configured in a way that it does MAC address filtering (layer 2 security). So they only allow one MAC address to communicate on their switch port. That is the physical MAC address of the dedicated Linux server's physical network adapter. They will not allow additional MAC addresses to communicate through their network switch and they won't change their switch's configuration.
I setup KVM virtualization on the dedicated server. It works. I created a bridge adapter 'br0' and it works. But as soon as I create a virtual machine which tries to communicate to the net via this bridge, it instantly gets blocked by the ISP's switch because the virtual machine uses a...
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