ZyXEL Communications Prestige 480 - Manual (Page 158)

Prestige 480 Dual BRI ISDN Router
9-16 Filter Configuration
9.4 Applying Filters and Factory Defaults
This section shows you where to apply the filter(s) after you design it (them). Two sets of factory default
filter rules have been configured in Menu 21 to prevent NetBIOS traffic from triggering calls (see Figure 8-7
Menu 21 - Filter Set Configuration).
9.4.1 Ethernet traffic
You seldom need to filter Ethernet traffic; however, the filter sets may be useful to block certain packets,
reducing traffic and preventing security breaches. Go to Menu 3.1 (shown belo w) 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,. The factory default filter set, NetBIOS_LAN,
is inserted in the protocol filters field under Input Filter Sets in Menu 3.1 in order to prevent local
NetBIOS messages from triggering calls to the DNS server.
Figure 9-10 Filtering Ethernet traffic
9.4.2 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 protocol filters field under Call Filter Sets in Menu 11.5 to block local
NetBIOS traffic from triggering calls to the ISP.
Menu 3.1 - General Ethernet Setup
Input Filter Sets:
protocol filters=
device filters=
Output Filter Sets:
protocol filters=
device filters=
2
Press ENTER to Confirm or ESC to Cancel:
Factory
Default
Filter