ZyXEL Communications ADSL2+ Ethernet/USB Gateway 660RU-Tx Series, User Manual

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Prestige 660RU-Tx Series User’s Guide
Chapter 22 Filter Configuration 190
22.7 Applying Filters and Factory Defaults
This section shows you where to apply the filter(s) after you design it (them). Sets of factory
default filter rules have been configured in menu 21 (but have not been applied) to filter
traffic.
22.7.1 Ethernet Traffic
You seldom need to filter Ethernet traffic; however, the filter sets may be useful to block
certain packets, reduce traffic and prevent security breaches. Go to menu 3.1 (shown next) and
type 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 typing their numbers separated by commas, for example, 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 128 Filtering Ethernet Traffic
22.7.2 Remote Node Filters
Go to menu 11.5 (shown next) and type the number(s) of the filter set(s) as appropriate. You
can cascade up to four filter sets by typing 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.
Table 57 Filter Sets Table
FILTER SETS DESCRIPTION
Input Filter Sets: Apply filters for incoming traffic. You may apply protocol or device filter rules. See
earlier in this chapter for information on filters.
Output Filter Sets: Apply filters for traffic leaving the Prestige. You may apply filter rules for protocol
or device filters. See earlier in this section for information on types of filters.
Call Filter Sets: Apply filters to decide if a packet should be allowed to trigger a call.
Menu 3.1 – LAN Port Filter Setup
Input Filter Sets:
protocol filters= 3
device filters=
Output Filter Sets:
protocol filters=
device filters=
Press ENTER to Confirm or ESC to Cancel:
Apply filter 3 to block
NETBIOS traffic from the
LAN.