Layer Four Traceroute

Layer Four Traceroute (LFT ) is a fast, multi-protocol enabled traceroute variant that implements numerous other features, such as AS- number search by Regional Internet Registries and other reliable sources, loose source routing, firewall and load balancer detection, etc. LFT is best known for its use to create a route to the destination host by a variety of packet filters or firewalls track to recognize connection, performance or latency issues.

Operation

LFT sends various TCP SYN and FIN packets ( in contrast to Van Jacobson's UDP -based method) or UDP packets that use the IP protocol ` time to live ' (TTL) field and attempts to TIME_EXCEEDED ICMP response from each gateway along the path to to get hold of the destination host. LFT processed incidentally also various TCP, UDP, and ICMP packets to determine protocol- based routing statistics. LFT can query various information about the networks that it traverses. The LFT functions are described in detail in a number of important security - books.

Origin

LFT was published in 1998 as ' fft '. It was because of confusion with the fast Fourier transform (English: Fast Fourier Transform) renamed. LFT stands for 'layer four traceroute ', however, is often abbreviated as 'layer four trace'.

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  • Layer Four Traceroute Project
Regional Internet Registry Internet Control Message Protocol
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