ZyXEL Communications 202H - Manual (Page 204)

Prestige 202H User’s Guide
18-20 Filter Configuration
Table 18-5 Filter Sets Table
FILTER SETS DESCRIPTION
Input Filter Sets: Apply filters for incoming traffic. You may apply protocol or device filter
rules.
Output Filter Sets: Apply filters for traffic leaving the Prestige. You may apply filter rules for
protocol or device filters.
Call Filter Sets: Apply filters to decide if a packet should be allowed to trigger a call.
18.6.1 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 18-16 Filtering Ethernet Traffic
18.6.2 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.
For PPPoE encapsulation, you have the option of specifying remote node call filter sets. Insert the factory
default filter set, NetBIOS_WAN, in the 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 – LAN Port Filter Setup
Input Filter Sets:
protocol filters=
device filters=
Output Filter Sets:
protocol filters=
device filters=
2
Press ENTER to Confirm or ESC to Cancel:
Apply filter 2 to
block NETBIOS
traffic from the
LAN.