NMAP - A Stealth Port Scanner--reference

The file should contain a hostlist or list of network expressions separated by spaces,tabs or newlines. Using a hyphen as inputfile makes Nmap read from standard input.

The -F option scans only those ports listed in the nmap_services file (or the protocols file if the scan type is -sO). This is far faster than scanning all 65,535 ports!!

The?-ttl ?option sets the IPv4 packets time-to-live. The usefulness of this is in mapping paths through networks and determining ACL’s on firewalls (setting the ttl to one past the packet filter can help to determine information about the filtering rules themselves). Repeated Nmap scans to a single port using differing ttl values will emulate a traceroute style network path map (Try it,its great fun for a while,until you get bored and realise traceroute does it all for you automatically!).

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