![]() ![]() The more clients involved, the more potential ports need to be opened up. Unfortunately, for the sake of convenience, many vendors have opted to use a random port range, which presents a problem for firewalls which would have to open up all possible ports for a given client. This is typically achieved by initiating communication on a control channel (commonly 21), and then setting up data channels over either set or random ports - usually port 20 when determined, or between 10000-20000 when random. ![]() It was originally intended to be a standardised means of ensuring file transfers occur with little risk of data corruption by relying on the TCP stack, which provides a means of checking how packets arrive between client and server. The convenience of file transfer, and the inconvenience of allowing access:įTP has for a long time been one of the most common ways for transferring files between remote locations. ![]() The aim here is to introduce the concept of FTP and FTPS, and best practices for allowing access between clients and servers through a firewall.
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