Chapter 8 Packet Filters
P-660R-F1 Series User’s Guide
112
8.3 Packet Filter Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
8.3.1 Filter Types and NAT
There are two classes of filter rules, generic filter rules and protocol filter rules. Generic filter rules
act on the raw data from/to LAN and WAN. Protocol filter rules act on the IP packets. 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 ZyXEL Device 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 filters are applied to the raw packets that appear on the wire. They are applied at the
point when the ZyXEL Device is receiving and sending the packets; that is the interface. The
interface can be an Ethernet port or any other hardware port. The following diagram illustrates this.
Figure 69
Protocol and Generic Filter Sets
8.3.2 Firewall Versus Filters
Below are some comparisons between the ZyXEL Device’s filtering and firewall functions.
Log
Select a logging option from the following:
None
– No packets will be logged.
Match
- Only packets that match the rule parameters will be logged.
Not Match
- Only packets that do not match the rule parameters will be
logged.
Both
– All packets will be logged.
Action Match
Select the action for a matching packet.
Options are
Check Next Rule
,
Forward
and
Drop
.
Action Not Match
Select the action for a packet not matching the rule.
Options are
Check Next Rule
,
Forward
and
Drop
.
Back
Click this to return to the previous screen without saving.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
LABEL
DESCRIPTION
Protocol
Filters
Generic
Filters
NAT
Interface
Route
Incoming
Outgoing
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