P-2302R Series User’s Guide

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.

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

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

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

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

30.4Filter 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).

Chapter 30 Filter Configuration

288