Chapter 25 Filter Configuration
P-791R v2 User’s Guide
224
4
This brings you to menu 11.1.4. Apply a filter set (our example filter set 3) as shown in
5
Press
[ENTER
] to confirm after you enter the set numbers and to leave menu 11.1.4.
25.4 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. 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 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, or device 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; in other words the interface. The interface can be an
Ethernet port or any other hardware port. The following diagram illustrates this.
Figure 145
Protocol and Device Filter Sets
25.5 Applying a Filter
This section shows you where to apply the filter(s) after you design it (them). The ZyXEL
Device already has filters to prevent NetBIOS traffic from triggering calls, and block
incoming telnet, FTP and HTTP connections.
25.5.1 Applying LAN Filters
LAN traffic filter sets may be useful to block certain packets, reduce traffic and prevent
security breaches. Go to menu 3.1 (shown next) and enter the number(s) of the filter set(s) that
you want to apply as appropriate. You can choose up to four filter sets (from twelve) by
entering their numbers separated by commas, for example 3, 4, 6, 11. Input filter sets filter
incoming traffic to the ZyXEL Device and output filter sets filter outgoing traffic from the
ZyXEL Device.
Содержание P-791R
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Страница 7: ...Safety Warnings P 791R v2 User s Guide 7 This product is recyclable Dispose of it properly...
Страница 8: ...Safety Warnings P 791R v2 User s Guide 8...
Страница 20: ...Table of Contents P 791R v2 User s Guide 20...
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Страница 46: ...Chapter 2 Introducing the Web Configurator P 791R v2 User s Guide 46...
Страница 53: ...Chapter 3 Wizard Setup for Internet Access P 791R v2 User s Guide 53...
Страница 54: ...Chapter 3 Wizard Setup for Internet Access P 791R v2 User s Guide 54...
Страница 58: ...Chapter 4 Point to point Configuration P 791R v2 User s Guide 58...
Страница 59: ...59 PART II Network Setup WAN Setup 61 LAN Setup 83 Network Address Translation NAT Screens 93...
Страница 60: ...60...
Страница 82: ...Chapter 5 WAN Setup P 791R v2 User s Guide 82...
Страница 104: ...Chapter 7 Network Address Translation NAT Screens P 791R v2 User s Guide 104...
Страница 105: ...105 PART III Security Filter 107...
Страница 106: ...106...
Страница 110: ...110...
Страница 114: ...Chapter 9 Static Route P 791R v2 User s Guide 114...
Страница 118: ...Chapter 10 Dynamic DNS Setup P 791R v2 User s Guide 118...
Страница 128: ...Chapter 11 Remote Management Configuration P 791R v2 User s Guide 128...
Страница 140: ...Chapter 12 Universal Plug and Play UPnP P 791R v2 User s Guide 140...
Страница 141: ...141 PART V Maintenance System 143 Logs 149 Tools 153 Diagnostic 159...
Страница 142: ...142...
Страница 148: ...Chapter 13 System P 791R v2 User s Guide 148...
Страница 158: ...Chapter 15 Tools P 791R v2 User s Guide 158...
Страница 162: ...162...
Страница 168: ...Chapter 17 Introducing the SMT P 791R v2 User s Guide 168...
Страница 172: ...Chapter 18 General Setup P 791R v2 User s Guide 172...
Страница 178: ...Chapter 19 WAN Setup P 791R v2 User s Guide 178...
Страница 194: ...Chapter 22 Remote Node Setup P 791R v2 User s Guide 194...
Страница 198: ...Chapter 23 Static Route Setup P 791R v2 User s Guide 198...
Страница 226: ...Chapter 25 Filter Configuration P 791R v2 User s Guide 226...
Страница 228: ...Chapter 26 SNMP Configuration P 791R v2 User s Guide 228...
Страница 230: ...Chapter 27 System Password P 791R v2 User s Guide 230...
Страница 240: ...Chapter 28 System Information Diagnosis P 791R v2 User s Guide 240...
Страница 268: ...Chapter 31 IP Routing Policy Setup P 791R v2 User s Guide 268...
Страница 272: ...Chapter 32 Schedule Setup P 791R v2 User s Guide 272...
Страница 278: ...Chapter 33 Troubleshooting P 791R v2 User s Guide 278...
Страница 280: ...280...
Страница 285: ...Appendix A Product Specifications P 791R v2 User s Guide 285 Figure 194 Masonry Plug and M4 Tap Screw...
Страница 286: ...Appendix A Product Specifications P 791R v2 User s Guide 286...
Страница 320: ...Appendix E IP Address Assignment Conflicts P 791R v2 User s Guide 320...
Страница 324: ...Appendix F Common Services P 791R v2 User s Guide 324...
Страница 330: ...Appendix G Command Interpreter P 791R v2 User s Guide 330...
Страница 342: ...Appendix H Log Descriptions P 791R v2 User s Guide 342...
Страница 348: ...Appendix J Legal Information P 791R v2 User s Guide 348...
Страница 354: ...Appendix S Customer Support P 791R v2 User s Guide 38...