LFT, short for Layer Four Traceroute, is a sort of 'traceroute' that often 
works much faster (than the commonly-used Van Jacobson method) and goes through
many configurations of packet-filter based firewalls. More importantly, LFT 
implements numerous other features including AS number lookups, loose source 
routing, netblock name lookups, et al. Though LFT has been around since 1998,
its development effort has just recently resumed.

WWW:  http://oppleman.com/lft/

Ported to FreeBSD by:
Marco P. Rodrigues