root@gateway:~# wget http://vcalinus.gemenii.ro/prefixtree.c
root@gateway:~# make prefixtree
cc     prefixtree.c   -o prefixtree
root@gateway:~# ./prefixtree
IPv4 u32 hash filter generator - (C) 2006 Calin Velea

Syntax: prefixtree {prefix.in} {u32filters.out} {interface} {src/dst} [batch]