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ZyAIR Wireless Gateway Series User’s Guide
24-16 Filter and Firewall Configuration
24.6.1 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 24-14 Filtering Ethernet Traffic
24.6.2 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. 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.
Figure 24-15 Filtering Remote Node Traffic
Note that call filter sets are visible when you select PPTP or PPPoE encapsulation.
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:
A
pply filter 2 to
block NETBIOS
traffic from the
LAN
Menu 11.5 - Remote Node Filter
Input Filter Sets:
protocol filters= 3
device filters=
Output Filter Sets:
protocol filters= 1
device filters=
Call Filter Sets:
Protocol filters=
Device filters=
Enter here to CONFIRM or ESC to CANCEL:
A
pply filter 3 to block
Tel, FTP and Web
traffic from the WAN.
A
pply filter 1 to block
NETBIOS traffic to
the WAN.