ZyXEL P-202H User Guide - Page 247
Edit Comments, Menu 21.1.3 - Filter, Rules Summary, Active, IP Protocol, Equal, Port # Comp, Action
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P-202H Plus v2 User's Guide 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 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. • 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. Chapter 25 Filter Configuration 246