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FTP Servers have to "Listen" on some port, otherwise they would not be on the Net. The Default port is 21, but lots of things out there are looking at that. In order to "Hide" one approach is to use some other Port Number. Another thing to do is be a "Moving Target". Use IP numbers that can be changed easily if you want to "Disappear". Dynamic IP's are good for this. Posting the same DNS name that follows changes to dynamic IP numbers means you can be found easily by using the Name Provided. Might not want to do that.
Another issue is how to control "Access". If you allow an unlimited number of "Anonymous" connections, you will soon drown in massive connections. Slow FTP Sites can only handle a small number of users at once (4 say). Another "Control" method is to only allow specific IP's to connect. A good way to create a specific "Account" for each user you want to allow on your site. IP's are like public keys and do not have to be kept "Secret" like Passwords do.
Using "Ports" that are used by Game servers and File Swapping Servers (Kazaa etc.) is not a good idea. ISP's will be checking those as well as port 21 when they are looking for "File Providers" on their networks.
[ November 02, 2001: Last edited by crowdirt ]</p>
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