+What: /sys/class/net/<iface>/name_assign_type
+Date: July 2014
+KernelVersion: 3.17
+Contact: netdev@vger.kernel.org
+Description:
+ Indicates the name assignment type. Possible values are:
+ 1: enumerated by the kernel, possibly in an unpredictable way
+ 2: predictably named by the kernel
+ 3: named by userspace
+ 4: renamed
+
What: /sys/class/net/<iface>/addr_assign_type
Date: July 2010
KernelVersion: 3.2