commandline session
$nmap 127.0.0.1 Starting Nmap 6.00 ( http://nmap.org ) at 2013-11-24 17:56 IST Nmap scan report for localhost (127.0.0.1) Host is up (0.00019s latency). Not shown: 997 closed ports PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 111/tcp open rpcbind Nmap done: 1 IP address (1 host up) scanned in 0.10 seconds $nmap -O 127.0.0.1 TCP/IP fingerprinting (for OS scan) requires root privileges. QUITTING! $sudo nmap -O 127.0.0.1 [sudo] password for jeffrin: Starting Nmap 6.00 ( http://nmap.org ) at 2013-11-24 17:56 IST Nmap scan report for localhost (127.0.0.1) Host is up (0.000057s latency). Not shown: 997 closed ports PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 111/tcp open rpcbind No exact OS matches for host (If you know what OS is running on it, see http://nmap.org/submit/ ). TCP/IP fingerprint: OS:SCAN(V=6.00%E=4%D=11/24%OT=22%CT=1%CU=32670%PV=N%DS=0%DC=L%G=Y%TM=5291F0 OS:7A%P=x86_64-unknown-linux-gnu)SEQ(SP=FF%GCD=1%ISR=111%TI=Z%CI=Z%II=I%TS= OS:8)OPS(O1=M400CST11NW6%O2=M400CST11NW6%O3=M400CNNT11NW6%O4=M400CST11NW6%O OS:5=M400CST11NW6%O6=M400CST11)WIN(W1=8000%W2=8000%W3=8000%W4=8000%W5=8000% OS:W6=8000)ECN(R=Y%DF=Y%T=41%W=8018%O=M400CNNSNW6%CC=Y%Q=)T1(R=Y%DF=Y%T=41% OS:S=O%A=S+%F=AS%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%DF=Y%T=41%W=0%S=A%A=Z%F=R%O=% OS:RD=0%Q=)T5(R=Y%DF=Y%T=41%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=41%W OS:=0%S=A%A=Z%F=R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=41%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=) OS:U1(R=Y%DF=N%T=41%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=Y%D OS:FI=N%T=41%CD=S) Network Distance: 0 hops OS detection performed. Please report any incorrect results at http://nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 12.17 seconds $ $sudo nmap -O 192.168.0.1 Starting Nmap 6.00 ( http://nmap.org ) at 2013-11-24 17:59 IST Nmap scan report for 192.168.0.1 Host is up (0.00047s latency). Not shown: 998 closed ports PORT STATE SERVICE 53/tcp open domain 80/tcp open http MAC Address: 5C:D9:98:5C:01:1A (D-Link) Device type: general purpose Running: Linux 2.6.X OS CPE: cpe:/o:linux:kernel:2.6 OS details: Linux 2.6.29 - 2.6.31 Network Distance: 1 hop OS detection performed. Please report any incorrect results at http://nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 2.10 seconds $
nmap . -O: Enable OS detection – Video Tutorial Related
[source : http://www.youtube.com/user/metalx1000 ]
[youtube https://www.youtube.com/watch?v=XaCzpqIU5-A?rel=0&w=560&h=315]