포트 스캔..

#nmap -p 1-65535 localhost

 

==> 현재 시스템에 어떤 포트가 떠 있는지 모든 포트에 대해 확인 가능.

      nmap localhost 는 /etc/services의 well known port만 스캔한다.

  

[출력 결과]

 

Interesting ports on localhost (127.0.0.1):
(The 65525 ports scanned but not shown below are in state: closed)
Port       State       Service
21/tcp     open        ftp                    
22/tcp     open        ssh                    
23/tcp     open        telnet                 
25/tcp     open        smtp                   
119/tcp    open        nntp                   
972/tcp    open        unknown                
8118/tcp   open        unknown                
32768/tcp  open        unknown                
32769/tcp  open        unknown                

Nmap run completed -- 1 IP address (1 host up) scanned in 92 seconds