ZyXEL Prestige 202H Plus ISDN Router 91-003-154001B Manuale Utente

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91-003-154001B

P-202H Plus v2 User’s Guide

Chapter 25 Filter Configuration

246

4 Enter a descriptive name or comment in the Edit Comments field and press [ENTER].

5 Press [ENTER] at the message [Press ENTER to confirm] to open Menu 21.1.3 - Filter

Rules Summary

6 Enter 1 to configure the first filter rule (the only filter rule of this set). Make the entries in

this menu as shown in the following figure.

Figure 147 Example Filter: Menu 21.1.3.1

• Select Yes from the Active field to activate this rule.
• 6 is the TCP IP Protocol.
• The Port # for the telnet service (TCP protocol) is 23. See RFC 1060 for port numbers of

well-known services.

• Select Equal from the Port # Comp field as you are looking for packets going to port 23

only.

• Select Drop in the Action Matched

field so that the packet will be dropped if its

destination is the telnet port.

• Select Forward from the Action Not Matched field so that the packet will be forwarded

if its destination is not the telnet port.

• Press [SPACE BAR] and then [ENTER] to choose this filter rule type. The first filter rule

type determines all subsequent filter types within a set.

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

Menu 21.1.3.1 - 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 #= 0
            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 Toggle.