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Prestige 310 Broadband Sharing Gateway
7-18 Filters
7.5 Applying a Filter and Factory Defaults
This section shows you where to apply the filter(s) after you design it (them). Three sets of factory default
filter rules have been configured in Menu 21 to prevent NetBIOS traffic from triggering calls and to prevent
incoming telnetting.
7.5.1 LAN traffic
You seldom need to filter LAN traffic; however, the filter sets may be useful to block certain packets, reduce
traffic and prevent security breaches. Go to Menu 3.1 (shown below) and enter the number(s) of the filter
set(s) that you want to apply as appropriate. You can choose up to four filter sets (from twelve) by entering
their numbers separated by commas, e.g., 3, 4, 6, 11. Input filter sets filter incoming traffic to the Prestige
and Output filter sets filter outgoing traffic from the Prestige. The factory default set, NetBIOS_LAN, is
inserted in protocol filters –field under Input Filter Sets in Menu 3.1 to block NetBIOS traffic to the
Prestige from the LAN.
Figure 7-15 Filtering LAN Traffic
7.5.2 Remote Node Filters
Go to Menu 11.5 (shown below) and enter the number(s) of the filter set(s) as appropriate. You can cascade
up to four filter sets by entering their numbers separated by commas. The factory default filter set,
NetBIOS_WAN, is inserted in the protocol filters field under Call Filter Sets in Menu 11.5 to block local
NetBIOS traffic from triggering calls to the ISP (when you are using PPTP/PPPoE encapsulation only).
Filter set three, Telnet_FTP_WAN, blocks telnet and FTP connections from the WAN Port to help prevent
security breaches.
Menu 3.1 – LAN Port Filter Setup
Input Filter Sets:
protocol filters= 2
device filters=
Output Filter Sets:
Protocol filters=
device filters=
Press ENTER to Confirm or ESC to Cancel:
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