Nortel 252, Configuration

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Chapter 11 Filter configuration 151
Nortel Business Secure Router 252 Configuration — Advanced
Applying LAN Filters
LAN traffic filter sets are useful to block certain packets, reduce traffic and
prevent security breaches. Go to menu 3.1 (shown next) and enter the numbers of
the filter sets that you want to apply, as appropriate. You can choose up to four
filter sets (from twelve) by entering their numbers separated by commas, for
example., 3, 4, 6, 11. Input filter sets filter incoming traffic to the Business Secure
Router and output filter sets filter outgoing traffic from the Business Secure
Router.
Figure 70 Filtering LAN Traffic
Applying Remote Node Filters
Go to menu 11.1.4 (shown in Figure 71 – note that call filter sets are only present
for PPPoE encapsulation) and enter the numbers of the filter sets, as appropriate.
You can cascade up to four filter sets by entering their numbers separated by
commas. The Business Secure Router already has filters to prevent NetBIOS
traffic from triggering calls, and to block incoming Telnet, FTP and HTTP
connections. For
PPPoE or PPPoA encapsulation, you have the additional option
of specifying remote node call filter sets.
Menu 3.1 – LAN Port Filter Setup
Input Filter Sets:
protocol filters=
device filters=
Output Filter Sets:
protocol filters=
device filters=
Press ENTER to Confirm or ESC to Cancel: