In addition, by overwriting the PORT command with its own internal address, the firewall overwrites the FTP- server built-in protection mechanism that protects against this type of attack.

• 另外，通过使用它自己的内部地址覆盖 PORT 命令，防火墙会覆盖 FTP 服务器内置的用来保护不受这种类型攻击的保护机制。