Hi Evandro. I've tested netmap-ipfw on real NICs. Use " ./kipfw -i netmap:em0 -i netmap:em1 " to run netmap-ipfw on em0 and em1. ipfw works as a bridge and copy incoming packets to em0 to em1 if they pass defined rules (and vice versa, from em1 to em0). If you still have problem with ipfw-netmap, please send your scenario for testing it.