ZyXEL Communications 1 Guia do Utilizador descarregar pdf (Página 174)

13-16 Filter Configuration

Figure 13-12 Example Filter Rules Summary

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

6. Enter 11 from the main menu to display menu 11.

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

8. This brings you to menu 11.5. Apply the TELNET_FTP_WAN filter set (filter set 7) as shown in

Figure 13-15.

13.4 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 and 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 figure illustrates this.

Menu 21.7 - 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:

1 2 ... 169 170 171 172 173 174 175 176 177 178 179 ... 284 285

Vikicmj 04 Jan 2024 | 10:44:24

urenrjrjkvnm

Evalyw 07 Jan 2024 | 13:35:47

Med

Viktorimky 13 Jan 2024 | 22:28:53

Cinema

ZyXEL Communications 1 Guia do Utilizador Página 174