NMAP UTILITY

How To Handle NMAP

NMAP is one of the best tool for knowing the target information.This can be used as follows:-

Download the NMAP as said in the last post.Install the NMAP.exe file.In the command prompt type nmap and its options.Its options are:

Nmap 4.20 ( http://insecure.org/ )

Usage: nmap [Scan Type(s)] [Options] {target specification}

TARGET SPECIFICATION:

Can pass hostnames, IP addresses, networks, etc.

Ex: scanme.nmap.org, microsoft.com/24, 192.168.0.1; 10.0.0-255.1-254

-iL : Input from list of hosts/networks

-iR : Choose random targets

--exclude : Exclude hosts/networks

--excludefile : Exclude list from file

HOST DISCOVERY:

-sL: List Scan - simply list targets to scan

-sP: Ping Scan - go no further than determining if host is online

-P0: Treat all hosts as online -- skip host discovery

-PS/PA/PU [portlist]: TCP SYN/ACK or UDP discovery to given ports

-PE/PP/PM: ICMP echo, timestamp, and netmask request discovery probes

-n/-R: Never do DNS resolution/Always resolve [default: sometimes]

--dns-servers : Specify custom DNS servers

--system-dns: Use OS's DNS resolver

SCAN TECHNIQUES:

-sS/sT/sA/sW/sM: TCP SYN/Connect()/ACK/Window/Maimon scans

-sU: UDP Scan

-sN/sF/sX: TCP Null, FIN, and Xmas scans

--scanflags : Customize TCP scan flags

-sI : Idlescan

-sO: IP protocol scan

-b : FTP bounce scan

PORT SPECIFICATION AND SCAN ORDER:

-p : Only scan specified ports

Ex: -p22; -p1-65535;

-p U:53,111,137,T:21-25,80,139,8080

-F: Fast - Scan only the ports listed in the nmap-services file)

-r: Scan ports consecutively - don't randomize

SERVICE/VERSION DETECTION:

-sV: Probe open ports to determine service/version info

--version-intensity : Set from 0 (light) to 9 (try all probes)

--version-light: Limit to most likely probes (intensity 2)

--version-all: Try every single probe (intensity 9)

--version-trace: Show detailed version scan activity (for debugging)

OS DETECTION:

-O: Enable OS detection (try 2nd generation w/fallback to 1st)

-O2: Only use the new OS detection system (no fallback)

-O1: Only use the old (1st generation) OS detection system

--osscan-limit: Limit OS detection to promising targets

--osscan-guess: Guess OS more aggressively

TIMING AND PERFORMANCE:

Options which take are in milliseconds, unless you append 's' (seconds), 'm' (minutes), or 'h' (hours) to the value (e.g. 30m).

-T[0-5]: Set timing template (higher is faster)

--min-hostgroup/max-hostgroup : Parallel host scan group sizes

--min-parallelism/max-parallelism : Probe parallelization

--min-rtt-timeout/max-rtt-timeout/initial-rtt-timeout : Specifies probe round trip time.

--max-retries : Caps number of port scan probe retransmissions.

--host-timeout : Give up on target after this long

--scan-delay/--max-scan-delay : Adjust delay between probes

FIREWALL/IDS EVASION AND SPOOFING:

-f; --mtu : fragment packets (optionally w/given MTU)

-D : Cloak a scan with decoys

-S : Spoof source address

-e : Use specified interface

-g/--source-port : Use given port number

--data-length : Append random data to sent packets

--ip-options : Send packets with specified ip options

--ttl : Set IP time-to-live field

--spoof-mac : Spoof your MAC address

--badsum: Send packets with a bogus TCP/UDP checksum

OUTPUT:

-oN/-oX/-oS/-oG : Output scan in normal, XML, s

-oA : Output in the three major formats at once

-v: Increase verbosity level (use twice for more effect)

-d[level]: Set or increase debugging level (Up to 9 is meaningful)

--open: Only show open (or possibly open) ports

--packet-trace: Show all packets sent and received

--iflist: Print host interfaces and routes (for debugging)

--log-errors: Log errors/warnings to the normal-format output file

--append-output: Append to rather than clobber specified output files

--resume : Resume an aborted scan

--stylesheet : XSL stylesheet to transform XML output to HTML

--webxml: Reference stylesheet from Insecure.Org for more portable XML

--no-stylesheet: Prevent associating of XSL stylesheet w/XML output

MISC:

-6: Enable IPv6 scanning

-A: Enables OS detection and Version detection

--datadir : Specify custom Nmap data file location

--send-eth/--send-ip: Send using raw ethernet frames or IP packets

--privileged: Assume that the user is fully privileged

--unprivileged: Assume the user lacks raw socket privileges

-V: Print version number

-h: Print this help summary page.

EXAMPLES:

nmap -v -A scanme.nmap.org

nmap -v -sP 192.168.0.0/16 10.0.0.0/8

nmap -v -iR 10000 -P0 -p 80