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Prestige 310 Broadband Sharing Gateway
Filters 7-17
Figure 7-13 Example Filter Rules Summary
After you’ve created the filter set, you must apply it.
Step 1. Enter 11 from the main menu to go to Menu 11.
Step 2. Go to the Edit Filter Sets field, press the [SPACEBAR] to toggle Yes to No and press
[ENTER].
Step 3. This brings you to Menu 11.5. Apply the TELNET_FTP_WAN filter set (filter set 3) as shown in
Figure 7-16.
7.4 Filter Types and SUA
There are two classes of filter rules, Generic Filter (Device) rules and Protocol Filter (TCP/IP and IPX)
rules. Generic Filter rules act on the raw data from/to LAN and WAN. Protocol Filter rules act on the IP and
IPX packets. Generic and TCP/IP filter rules are discussed in more detail in the next section. When SUA 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 SUA for outgoing packets and after SUA
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 7-14 Protocol and Device Filter Sets
Menu 21.5 - Filter Rules Summary
# A Type Filter Rules M m n
- - ---- ------------------------------------------------------------
1 Y IP Pr=6, SA=0.0.0.0, DA=0.0.0.0, DP=21 N D N
2 Y IP Pr=6, SA=0.0.0.0, DA=0.0.0.0, DP=23 N D F
3 N
4 N
5 N
6 N
Enter Filter Rule Number (1-6) to Configure: