Find an ftp software that can replace server-u. The requirements are as follows:

For an ftp software that can replace server-u, the requirements are as follows: -- Linux Enterprise Application-Linux server application information. The following is a detailed description. In linux, which software can replace server-u in windows?

Server-u configuration is as follows:
A total of four groups are set.

Group 1 uses Port 20 for direct login without encryption (used to download data). User bill
Group 2 uses port 2000 and encrypted port.
Group 3 uses port 7777 to encrypt the port
Group 4 uses port 9999 to encrypt the port



How can I implement it in linux?