Vigitron MaxiiNet Vi30018, Operational Manual

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The figure shown below illustrates how this function is applied to the real
environment.
Example:
(a) Enable TCP/UDP Filter function.
(b)
Select “positive” rule.
(c) Set port 5 as secure WAN port and select FTP and TELNET as the
filtering protocol.
(d) Place the server of the selected protocol at the secure WAN port.
Results
Physical Port The Behavior of Switch
Port 5 TELNET and FTP will be forwarded. Other protocol
will be discarded.
Other ports All protocol will be forwarded as the normal packet.