Port information collection (including common port attack direction summary)

1. Use online sites to detect, can not detect local
http://tool.chinaz.com/port/

2. Use nmap probe

nmap -A -V -T4 目标

3. Sword-speed TCP port scanner
　
4. common port attack direction

• Remote connection service port
  
• File sharing service port
  
• web application service port
  
• Database service port
  
• Mail service port
  
• Common network protocol port
  
• Special service port