Now i meet this question:
The host in my network with private IP as 192.168.1.41/32 wanted to give FTP services to Internet users.It is behind the firewall.So i need to configure it with port redirection.The config table like as:
202.38.*.*/32 21 mapped to 192.168.1.41/32 21
Then I ftp the 202.38.*.* from Internet,i connect it successfully.
But when I use the command 'ls',it cannt show the files in FTP host.
It printd:"turn to passing model",and i cant see nothing.
The ftpd server is Server-U in windows2000.
I know the FTP command port is 21,but transfer port is various per times(is it?)
I want to know what the reasons is.Thanks more.