ZyXEL Communications 650R-31/33 User Manual

Prestige 650R-31/33 ADSL Router 

Filter Configuration 

 

8-17 

Step 4.  Press [ENTER] at the message 

“

Press [ENTER] to confirm or [ESC] to cancel” to open Menu 

21.3.1 – TCP/IP Filter Rule. 

Step 5.  Type 1 to configure the first filter rule. Make the entries in this menu as shown next. 

When you press [ENTER] to confirm, the following screen appears. Note that there is only one filter rule in 
this set. 

 

Menu 21.3.1 - TCP/IP Filter Rule 

 

Filter #: 3,1 
Filter Type= TCP/IP Filter Rule 

Active= Yes 

IP Protocol= 6      IP Source Route= No 

Destination: IP Addr= 0.0.0.0 

IP Mask= 0.0.0.0 

Port #= 23 
Port # Comp= Equal 

                 Source: IP Addr= 0.0.0.0 

IP Mask= 0.0.0.0 

Port #=  

Port # Comp= None 

TCP Estab= No 
More= No             Log= None 

Action Matched= Drop 

Action Not Matched= Forward 

 

Press ENTER to Confirm or ESC to Cancel: 

 

Press [SPACE BAR] to choose this 

filter rule type. The first filter rule 

type determines all subsequent filter 

types within a set. 

Select Yes to make the rule active. 

6 is the TCP protocol. 

The port number for the telnet 

service (TCP protocol) is 23. See 

RFC-1060 for port numbers of well-

known services. 

Select Equal here 

as we are looking 

for packets going 

to port 23 only. 

There are no 

more rules to 

check.

Select Drop here so that the 

packet will be dropped if its 

destination is the telnet port. 

Select Forward here so that the packet will be forwarded if 

its destination is not the telnet port and there are no more 

rules in this filter set to check.  Select Next if there are 

more rules to check.