Viewing filters, Modifying filters – Netopia Router PN Series User Manual
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Reference Guide
You can add a TCP filter to a filter set with the following steps:
1.
In the Add Filter screen, toggle the Enabled field to Yes.
2.
Select Forward and toggle it to Yes.
3.
Select the Protocol Type field and type in TCP. Then press
Return.
4.
In the last field that appears, Established TCP Conns. Only, tog-
gle the entry to Yes and press Return. This new field configures
the filter to match TCP packets for established TCP connections
only.
5.
Select ADD THIS FILTER NOW and press Return.
With this filter in effect, users from outside the firewall cannot initiate
TCP connections to devices on your network, including your FTP
server, Web server, and Telnet. To provide limited access to your
network, set up a filter to forward traffic to a specific port, such as the
FTP server port, Web server port, or Telnet port, and to a specific IP
address and mask, in addition to restricting all outside TCP
connections.
Viewing filters
To display a view-only table of input (output) filters, select
Display/Change Input Filters (Display/Change Output Filters) in the
Add IP Filter Set screen.
Modifying filters
To modify a filter, select Display/Change Input Filter (Display/
Change Output Filter) in the Add IP Filter Set screen to display a table
of filters.
Select a filter from the table and press Return to go to the Change
Filter screen. The parameters in this screen are the same as the ones
in the Add Filter screen (see
“Adding filters to a filter set” on
).