bimap le0 0/0 -> 0/32
bimap le0 1/32 -> 1/32
bimap le0 128.0.0.0/1 -> 0/0
bimap le0 10.0.0.0/8 -> 1.2.3.0/24
bimap le0 10.0.5.6/24 -> 1.2.3.4/24