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basically, you're gonna set up serv-u to listen on a certain port (default is 21) and designate directories that will be a part of the FTP as well as permissions to those directories. the basics are read, write, delete, create and change permissions.
read is pretty obvious, users with read access can read and download files. write means they can push files to you. create means they can create directories. finally, change means they can change the name of directories. in FTP, users with change access can also change permissions on directories, however not all server software supports that. i am pretty sure that serv-u has a setting also that will allow or dissallow the command line command strings for FTP management, an added security feature if you don't want someone who thinks they know what they are doing snooping around on your stuff.
aside from the directory management, yes, you can also create users and user groups that can connect to your server. you can password protect the user accounts, and the users/groups are the primary way you manager server security. you grant permissions to directories per group, and add users to the groups that they need access to.
there's some basics there. there may be some specific features that serv-u supports that i did not touch on, but this is the basic concept behind FTP. for your own set up, if you are behind a router or firewall you need to configure them accordingly to allow users access to the server. again, default is port 21, but serv-u should give you the option to change the port if you want added security.
something to remember: most default connections are made with "anonymous" access. you may need to make a simple configuration to a single test directory with annonymous access allowed to it in order to test that your network is set up properly for people to connect to you, then begin restricting access after you ferify everything is working.
also, you may have to set serv-u to "PASV" to work behind a router.
good luck!
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