December 2019
Beginner
510 pages
12h 7m
English
Content preview from Networking Fundamentals
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Active FTP
With active FTP, the client will open a random port and connect to the FTP server on port 21. For the purposes of this explanation, we will use port 2031 as the port opened on the FTP client. Therefore, command communication is taking place between port 2031 on the client and port 21 on the server. Once the initial connection has been made, the client opens up the next port, in this case, 2032, to listen for the data communications coming from the server. All data communications will take place between ports 20 and 2031. You can see this in Figure 14.19:
Figure 14.19: Active FTP
The problem with this mode is that the firewall on ...
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