a network device comprises a host , including a device driver , and a network interface . the network interface includes a first media access controller , the first media access controller configured to , when activated , use a media access controller address for transferring data from the host to the first network , and transferring data from the first network to the host . a second media access controller is configured to , when activated , also use the media access controller address for transferring data from the host to the second network , and transferring data from the second network to the host . the device driver is configured to select either the first network or the second network for communication with the host , and the first media access controller or the second media access controller is respectively activated in response to the device driver selecting the first network or the second network .