Overview:NMAP is a very well known port scanning (and stuff) tool.Cookbook Examples:Here's a couple of simple things you can do with nmap:Ping Scan (fping)fping is great, and easy to use, but you can also scan/ping a network with fping:
Simple Port Scanning:You can use nmap to tell you all the ports that the servers are listening over.
Specific port knocking: You can test specific ports rather then scanning all of them.
# nmap -sU -p 123 66.203.64.10 Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2012-04-25 13:26 EDT Interesting ports on static-10-64-203-66.axsne.net (66.203.64.10): PORT STATE SERVICE 123/udp open|filtered ntp Nmap finished: 1 IP address (1 host up) scanned in 0.409 seconds OS Detection:Each OS responds to queries a little bit different. nmap knows those differences, and can give you it's best guess on what kind of os the target boxes have:
Output Formats:You don't have to simply ugly up your shell with nmap output. There are a couple different ways you can output the results.
Basic Options Summary:The full (and up to date) version can be found at the nmap site. I just marked this up for easier reference.
Nmap 5.59BETA3 ( http://nmap.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 <inputfilename>: Input from list of hosts/networks -iR <num hosts>: Choose random targets --exclude <host1[,host2][,host3],...>: Exclude hosts/networks --excludefile <exclude_file>: Exclude list from file HOST DISCOVERY:-sL: List Scan - simply list targets to scan-sn: Ping Scan - disable port scan -Pn: Treat all hosts as online -- skip host discovery -PS/PA/PU/PY[portlist]: TCP SYN/ACK, UDP or SCTP discovery to given ports -PE/PP/PM: ICMP echo, timestamp, and netmask request discovery probes -PO[protocol list]: IP Protocol Ping -n/-R: Never do DNS resolution/Always resolve [default: sometimes] --dns-servers <serv1[,serv2],...>: Specify custom DNS servers --system-dns: Use OS's DNS resolver --traceroute: Trace hop path to each host -sU: UDP Scan -sN/sF/sX: TCP Null, FIN, and Xmas scans --scanflags <flags>: Customize TCP scan flags -sI <zombie host[:probeport]>: Idle scan -sY/sZ: SCTP INIT/COOKIE-ECHO scans -sO: IP protocol scan -b <FTP relay host>: FTP bounce scan PORT SPECIFICATION AND SCAN ORDER:-p <port ranges>: Only scan specified portsEx: -p22; -p1-65535; -p U:53,111,137,T:21-25,80,139,8080,S:9 -F: Fast mode - Scan fewer ports than the default scan -r: Scan ports consecutively - don't randomize --top-ports <number>: Scan <number> most common ports --port-ratio <ratio>: Scan ports more common than <ratio> SERVICE/VERSION DETECTION:-sV: Probe open ports to determine service/version info--version-intensity <level>: 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) SCRIPT SCAN:-sC: equivalent to --script=default--script=<Lua scripts>: <Lua scripts> is a comma separated list of directories, script-files or script-categories --script-args=<n1=v1,[n2=v2,...]>: provide arguments to scripts --script-trace: Show all data sent and received --script-updatedb: Update the script database. --script-help=<Lua scripts>: Show help about scripts. <Lua scripts> is a comma separted list of script-files or script-categories. OS DETECTION:-O: Enable OS detection--osscan-limit: Limit OS detection to promising targets --osscan-guess: Guess OS more aggressively TIMING AND PERFORMANCE:Options which take <time> are in seconds, or append 'ms' (milliseconds),'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 <size>: Parallel host scan group sizes --min-parallelism/max-parallelism <numprobes>: Probe parallelization --min-rtt-timeout/max-rtt-timeout/initial-rtt-timeout <time>: Specifies probe round trip time. --max-retries <tries>: Caps number of port scan probe retransmissions. --host-timeout <time>: Give up on target after this long --scan-delay/--max-scan-delay <time>: Adjust delay between probes --min-rate <number>: Send packets no slower than <number> per second --max-rate <number>: Send packets no faster than <number> per second FIREWALL/IDS EVASION AND SPOOFING:-f; --mtu <val>: fragment packets (optionally w/given MTU)-D <decoy1,decoy2[,ME],...>: Cloak a scan with decoys -S <IP_Address>: Spoof source address -e <iface>: Use specified interface -g/--source-port <portnum>: Use given port number --data-length <num>: Append random data to sent packets --ip-options <options>: Send packets with specified ip options --ttl <val>: Set IP time-to-live field --spoof-mac <mac address/prefix/vendor name>: Spoof your MAC address --badsum: Send packets with a bogus TCP/UDP/SCTP checksum OUTPUT:-oN/-oX/-oS/-oG <file>: Output scan in normal, XML, s|<rIpt kIddi3,and Grepable format, respectively, to the given filename. -oA <basename>: Output in the three major formats at once -v: Increase verbosity level (use -vv or more for greater effect) -d: Increase debugging level (use -dd or more for greater effect) --reason: Display the reason a port is in a particular state --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 <filename>: Resume an aborted scan --stylesheet <path/URL>: XSL stylesheet to transform XML output to HTML --webxml: Reference stylesheet from Nmap.Org for more portable XML --no-stylesheet: Prevent associating of XSL stylesheet w/XML output MISC:-6: Enable IPv6 scanning-A: Enable OS detection, version detection, script scanning, and traceroute --datadir <dirname>: 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.orgnmap -v -sn 192.168.0.0/16 10.0.0.0/8 nmap -v -iR 10000 -Pn -p 80 SEE THE MAN PAGE (http://nmap.org/book/man.html) FOR MORE OPTIONS AND EXAMPLES References:
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