pfsense/pfsense — pull request #782 by PiBa-NL (2013-08-25 18:56:39+00:00)
Title: Get subnet usable range

-new method for calculating ip_range_to_subnet_array() by Stilez Stilezy (works with IPv6 also.)
-added new method get_subnet_usable_range($ip, $bits)
-used usable_range in dhcp server pages

-ipsec, natting to a subnet, use only the 'usable' part of the subnet