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Chapter 12 Packet Filter
P-660HN-F1A User’s Guide
224
12.3 Packet Filter Technical Reference
This section provides some technical background information about the topics
covered in this chapter.
12.3.1 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 P-660HN-F1A 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 P-660HN-F1A 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 93
Protocol and Generic Filter Sets
12.3.2 Firewall Versus Filters
Below are some comparisons between the P-660HN-F1A’s filtering and firewall
functions.
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.
Table 65
Security > Packet Filter > Edit (Generic Filter) > Edit Rule (continued)
LABEL
DESCRIPTION
Protocol
Filters
Generic
Filters
NAT
Interface
Route
Incoming
Outgoing
Содержание P-660HN-F1A
Страница 2: ......
Страница 10: ...Contents Overview P 660HN F1A User s Guide 10...
Страница 20: ...Table of Contents P 660HN F1A User s Guide 20...
Страница 21: ...21 PART I User s Guide...
Страница 22: ...22...
Страница 36: ...Chapter 2 Introducing the Web Configurator P 660HN F1A User s Guide 36...
Страница 44: ...Chapter 3 Status Screens P 660HN F1A User s Guide 44...
Страница 77: ...Chapter 4 Tutorials P 660HN F1A User s Guide 77 2 Leave the other settings as their defaults and click Apply...
Страница 84: ...Chapter 4 Tutorials P 660HN F1A User s Guide 84 Physical Port 1 3 exclude port 4 3 Click Apply...
Страница 88: ...Chapter 4 Tutorials P 660HN F1A User s Guide 88...
Страница 103: ...103 PART II Technical Reference...
Страница 104: ...104...
Страница 142: ...Chapter 7 LAN Setup P 660HN F1A User s Guide 142...
Страница 188: ...Chapter 9 Network Address Translation NAT P 660HN F1A User s Guide 188...
Страница 210: ...Chapter 10 Firewalls P 660HN F1A User s Guide 210...
Страница 236: ...Chapter 13 Certificates P 660HN F1A User s Guide 236...
Страница 240: ...Chapter 14 Static Route P 660HN F1A User s Guide 240...
Страница 256: ...Chapter 16 Quality of Service QoS P 660HN F1A User s Guide 256 Figure 111 QoS Class Example Boss 2...
Страница 276: ...Chapter 17 Dynamic DNS Setup P 660HN F1A User s Guide 276...
Страница 288: ...Chapter 18 Remote Management P 660HN F1A User s Guide 288...
Страница 344: ...Chapter 24 Troubleshooting P 660HN F1A User s Guide 344...
Страница 376: ...Appendix A Setting up Your Computer s IP Address P 660HN F1A User s Guide 376...
Страница 386: ...Appendix B Pop up Windows JavaScripts and Java Permissions P 660HN F1A User s Guide 386...
Страница 396: ...Appendix C IP Addresses and Subnetting P 660HN F1A User s Guide 396...
Страница 420: ...Appendix F Legal Information P 660HN F1A User s Guide 420...
Страница 430: ...Index P 660HN F1A User s Guide 430...