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P-2302R Series User’s Guide

Chapter 30 Filter Configuration 288

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).

After you’ve created the filter set, you must apply it.

1 Enter 11 from the main menu to go to menu 11.

2 Go to the Edit Filter Sets field, press [SPACE BAR] to select Yes and press [ENTER].

3 This brings you to menu 11.5. Apply a filter set (our example filter set 3).

4 Press [ENTER] to confirm after you enter the set numbers and to leave menu 11.5.

30.4 Filter Types and NAT

There are two classes of filter rules, Generic Filter (Device) rules and protocol filter (TCP/

IP) rules. Generic filter rules act on the raw data from/to LAN and WAN. Protocol filter rules

act on the IP packets. Generic and TCP/IP filter rules are discussed in more detail in the next

section. When NAT (Network Address Translation) is enabled, the inside IP address and port

number are replaced on a connection-by-connection basis, which makes it impossible to know

the exact address and port on the wire. Therefore, the Prestige applies the protocol filters to the

“native” IP address and port number before NAT for outgoing packets and after NAT for

incoming packets. On the other hand, the generic, or device filters are applied to the raw

packets that appear on the wire. They are applied at the point when the Prestige is receiving

and sending the packets; i.e. the interface. The interface can be an Ethernet port or any other

hardware port. The following diagram illustrates this.

Figure 160 Protocol and Device Filter Sets

30.5 Applying a Filter

This section shows you where to apply the filter(s) after you design it (them).

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