ZyXEL Communications P-974H - V3.70, Руководство пользователя

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Chapter 5 Advanced
P-974H/HW Series User’s Guide
49
5.5 Port Filtering
You can set the ZyXEL Device to drop traffic based on service port numbers and
protocol types. This feature allows you to specify the applications (such as MSN
and TFTP) the computers on the LAN cannot use. See
Appendix D on page 99 for
common services.
Click Advanced > Port Filtering to display the configuration screen.
Figure 13 Advanced: Port Filtering
The following table describes the labels in this screen.
Table 14 Advanced: Port Filtering
LABEL DESCRIPTION
Start Port Enter the beginning service port number whose traffic you want the
ZyXEL Device to block.
End Port Type the ending service port number whose traffic you want the ZyXEL
Device to block. If you want to exclude only one service, enter the same
service port number as in the Start Port field above.
Protocol Specify the traffic protocol type. Choices are TCP, UDP and Both.
Enabled Select Enabled to block traffic based on the selected port number(s)
and protocol type.
Apply Click Apply to save the settings.