FTP Example 2

If you also wanted to allow external clients access to a specific FTP server on your network, you could add a few more rules. In this example, our FTP server is 192.77.203.12

set filter ftp.in 3 permit 0.0.0.0/0 192.77.203.12/32 tcp dst eq 21

set filter ftp.out 3 permit 192.77.203.12/32 0.0.0.0/0 tcp src eq 21 dst gt 1023 established

set filter ftp.out 4 permit 192.77.203.12/32 0.0.0.0/0 tcp src eq 20 dst gt 1023

set filter ftp.in 4 permit 0.0.0.0/0 192.77.203.12 tcp src gt 1023 dest eq 20 established

8-14 Packet Filters

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USRobotics NETServer/8, NETServer/16 manual FTP Example