Linux Security Overview, ISSA-PS 2003, Page 00018

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Page 18: Using Netstat

  
  Using Netstat 
  Netstat comes with all Linux distros, is used for all sort of network-configuration queries.
  # netstat -natp | grep LISTEN | sort
  Active Internet connect ions (servers and established)
  Proto Local Address     Remote    State   PID/Program name   
  tcp   0.0.0.0:21        0.0.0.0:* LISTEN  797/tcpserver       
  tcp   0.0.0.0:22        0.0.0.0:* LISTEN  718/sshd            
  tcp   0.0.0.0:25        0.0.0.0:* LISTEN  17592/master        
  tcp   0.0.0.0:465       0.0.0.0:* LISTEN  17592/master        
  tcp   0.0.0.0:995       0.0.0.0:* LISTEN  1636/stunnel        
  tcp   0.0.0.0:7777      0.0.0.0:* LISTEN  23476/sshd          
  tcp   0.0.0.0:10091     0.0.0.0:* LISTEN  1774/stunnel        
  tcp   0.0.0.0:10092     0.0.0.0:* LISTEN  1776/stunnel        
  tcp   0.0.0.0:10093     0.0.0.0:* LISTEN  1778/stunnel        
  tcp   0.0.0.0:10094     0.0.0.0:* LISTEN  1780/stunnel        
  tcp   127.0.0.1:53      0.0.0.0:* LISTEN  29019/dnscache

Presented at ISSA Puget Sound, 2003.