ZyXEL p-660h-61 Guida Utente

Prestige 660H Series User’s Guide 

Filter Configuration 

        30-13 

 

 

 

 

 

 

 

 

 

 

 

 

 

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. 

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. 

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. 

 

Menu 21.1.6 - Filter Rules Summary 
 
 # A Type                       Filter Rules                              M m n
 - - ---- --------------------------------------------------------------- - - -
 1 Y IP   Pr=6, SA=0.0.0.0, DA=0.0.0.0, DP=23                             N D F
 2 N 
 3 N 
 4 N 
 5 N 
 6 N 
 
                 Enter Filter Rule Number (1-6) to Configure: 1 

M = N means an action can be taken immediately. 

The action is to drop the packet (m = D) if the 

action is matched and to forward the packet 

immediately (n = F) if the action is not matched no 

matter whether there are more rules to be 

checked (there aren’t in this example).

This shows you that you have 

configured and activated (A = Y) a 

TCP/IP filter rule (Type = IP, Pr = 6) 

for destination telnet ports (DP = 

23).