ZyXEL Communications 660RU-Tx Series User Manual

Prestige 660RU-Tx Series User’s Guide

Chapter 22 Filter Configuration

190

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.

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

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

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.