LFT (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 TCP, UDP, or ICMP-based traces, AS number
lookups through several reliable sources, loose
source routing, netblock name lookups, and more.
LFT also distinguishes between layer-4
protocols, which make its statistics slightly more
realistic, and gives a savvy user the ability to
trace protocol routes, not just layer-3 hops.
License: Open Software License
Changes:
WhoB default behavior was changed due to popular
demand. New configure options were added to
perform universal builds and to force gettimeofday
calls instead of relying on possibly low-precision
packet header times on some platforms. The build
process was improved on NetBSD and Darwin/Mac OS
X.