A range of IP addresses specified by an IP
address/IP network mask pair. For example,
class B address range of X.X.X.X with a network
mask of 255.255.0.0 includes all IP addresses
from X.X.0.0 to X.X.255.255. Note that if
ranges are configured such that one range sub-
sumes another range (e.g., 10.0.0.0 mask
255.0.0.0 and 10.1.0.0 mask 255.255.0.0), the
most specific match is the preferred one.