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Experiment no 2: Packet sniffer tools

Aim of experiment : Download and install nmap. Use it with different options to scan open

ports, perform OS fingerprinting, do a ping scan, tcp port scan, udp port scan, etc.

Objective of experiment: Objective of this module to learn nmap installation & use this to scandifferent ports.

Scope: Used for ip spoofing and port scanning.

Technology: Networing

Theory:

Nmap !"Networ #apper"$ is a free and open source !license$ utilit% for networ discover% and

securit% auditing. #an% s%stems and networ administrators also find it useful for tass such asnetwor inventor%, managing service upgrade schedules, and monitoring host or service uptime.

Nmap uses raw ' pacets in novel wa%s to determine what hosts are available on the networ,

what services !application name and version$ those hosts are offering, what operating s%stems

!and OS versions$ the% are running, what t%pe of pacet filters(firewalls are in use, and do)ens of

other characteristics. t was designed to rapidl% scan large networs, but wors fine against

single hosts. Nmap runs on all major computer operating s%stems, and official binar% pacages

are available for *inu+, indows, and #ac OS -. n addition to the classic commandline Nmap

e+ecutable, the Nmap suite includes an advanced /U and results viewer !0enmap$, a fle+ible

data transfer, redirection, and debugging tool !Ncat$, a utilit% for comparing scan results !Ndiff$,

and a pacet generation and response anal%sis tool !Nping$.

Nmap features include:

1 2ost discover% 3 dentif%ing hosts on a networ. 4or e+ample, listing the hosts that

respond to 56' and(or 6#' re7uests or have a particular port open.

1 'ort scanning 3 8numerating the open ports on target hosts.

1 9ersion detection 3 nterrogating networ services on remote devices to determine

application name and version number.;