Layer Four Traceroute Layer Four Traceroute - All-in-one traceroute tool
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Layer Four Traceroute Description

Layer Four Traceroute - All-in-one traceroute tool Layer Four Traceroute gives you 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.LFT is the all-in-one traceroute tool because it can launch a variety of different probes using both UDP and TCP layer-4 protocols. For example, rather than only launching UDP probes in an attempt to elicit ICMP "TTL exceeded" from hosts in the path, LFT can send TCP SYN or FIN probes to target arbitrary services.Then, LFT listens for "TTL exceeded" messages, TCP RST (reset), and various other interesting heuristics from firewalls or other gateways in the path. LFT also distinguishes between TCP-based protocols (source and destination), which make its statistics slightly more realistic, and gives a savvy user the ability to trace protocol routes, not just layer-3 (IP) hops. With LFT's verbose output, much can be discovered about a target network. Requirements:· libpcap.

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