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My Centos 6.5 machine installed with 2 ethernet device (eth0 and eth1). But when I listed all ethernet device with ifconfig -a as root, in resulted list have another ethernet device usb0, as follow:
usb0 Link encap:Ethernet HWaddr 36:40:B5:87:34:8C
inet addr:169.254.95.120 Bcast:169.254.255.255 Mask:255.255.0.0
inet6 addr: fe80::3440:b5ff:fe87:348c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1716 errors:0 dropped:0 overruns:0 frame:0
TX packets:1314 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:238284 (232.6 KiB) TX bytes:230702 (225.2 KiB)
AFAIK, I never configure it. My Question is, What are the purpose of usb0 ethernet device on my machine?