Layer Four Traceroute (LFT)

Layer Four Traceroute (LFT) is a fast, multi-protocol traceroute engine, that also implements numerous other features including AS number lookups through Regional Internet Registries and other reliable sources, Loose Source Routing, firewall and load balancer detection, etc. LFT is best known for its use by network security practitioners to trace a route to a destination host through many configurations of packet-filters / firewalls, and to detect network connectivity, performance or latency problems.

source: en.wikipedia.org/wiki/Layer_four_traceroute