[Qemu-devel] why mac addresses are different between inside and outside of vm

[yue-kvm]

hi, all
nwfilter has many rules which depends on the mac of vm, but i find the mac 
address inside vm is different from mac outside of vm.
outside mac:
vnet0 Link encap:Ethernet HWaddr FE:54:00:71:15:7B ,
inside mac:
eth0 Link encap:Ethernet HWaddr 52:54:00:71:15:7B ,virtio
it looks like vnet* are always changed to start with FE, why?
where is the  code to  do this?
 
thanks very much.