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NAT Advanced Screen

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Chapter 16 Network Address Translation (NAT) Table 64 Network > NAT > Application (continued) LABEL DESCRIPTION Application Rules Summary # This is the number of an individual port forwarding server entry. Active This icon is turned on when the rule is enabled. Name This field displays a name to identify this rule. Port This field displays the port number(s). Server IP Address This field displays the inside IP address of the server. Modify Click the Edit icon to display and modify an existing rule setting in the fields under Add Application Rule. Apply Reset Click the Remove icon to delete a rule. Click Apply to save your changes back to the Router. Click Reset to begin configuring this screen afresh. 16.5 NAT Advanced Screen Some services use a dedicated range of ports on the client side and a dedicated range of ports on the server side. With regular port forwarding you set a forwarding port in NAT to forward a service (coming in from the server on the WAN) to the IP address of a computer on the client side (LAN). The problem is that port forwarding only forwards a service to a single LAN IP address. In order to use the same service on a different LAN computer, you have to manually replace the LAN computer's IP address in the forwarding port with another LAN computer's IP address. Trigger port forwarding solves this problem by allowing computers on the LAN to dynamically take turns using the service. The Router records the IP address of a LAN computer that sends traffic to the WAN to request a service with a specific port number and protocol (a "trigger" port). When the Router's WAN port receives a response with a specific port number and protocol ("incoming" port), the Router forwards the traffic to the LAN IP address of the computer that sent the request. After that computer's connection for that service closes, another computer on the LAN can use the service in the same manner. This way you do not need to configure a new IP address each time you want a different LAN computer to use the application. To change your Router's trigger port settings, click Network > NAT > Advanced. The screen appears as shown. 142 NBG-419N v2 User's Guide

Section	Page
NBG-419N v2	1
Contents Overview	3
Table of Contents	5
User’s Guide	13
Getting to Know Your Router	15
1.1 Overview	15
1.2 Applications	15
1.3 Ways to Manage the Router	15
1.4 Good Habits for Managing the Router	16
1.5 LEDs	17
1.6 The WPS Button	18
1.7 Wall Mounting	18
ZyXEL NetUSB Share Center Utility	20
2.1 Overview	20
2.1.1 Quick Setup	20
2.1.2 Installing ZyXEL NetUSB Share Center Utility	20
2.2 The ZyXEL NetUSB Share Center Utility	21
2.2.1 The Menus	22
2.2.2 The ZyXEL NetUSB Share Center Configuration Window	23
2.2.3 The Auto-Connect Printer List Window	24
2.2.4 Exit the ZyXEL NetUSB Share Center Utility	25
Connection Wizard	27
3.1 Overview	27
3.2 Accessing the Wizard	27
3.3 Connect to Internet	28
3.3.1 Connection Type: DHCP	29
3.3.2 Connection Type: Static IP	29
3.3.3 Connection Type: PPPoE	30
3.3.4 Connection Type: PPTP	31
3.3.5 Connection Type: L2TP	32
3.4 Router Password	34
3.5 Wireless Security	34
3.5.1 Wireless Security: No Security	34
3.5.2 Wireless Security: WPA-PSK/WPA2-PSK	35
Introducing the Web Configurator	37
4.1 Overview	37
4.2 Accessing the Web Configurator	37
4.2.1 Login Screen	37
4.2.2 Password Screen	38
4.2.3 Home Screen	39
4.3 Resetting the Router	41
4.3.1 Procedure to Use the Reset Button	41
Monitor	43
5.1 Overview	43
5.2 What You Can Do	43
5.3 The Log Screen	43
5.3.1 View Log	43
5.4 BW MGMT Monitor	45
5.5 DHCP Table	45
5.6 Packet Statistics	46
5.7 WLAN Station Status	47
Router Modes	49
6.1 Overview	49
6.1.1 Web Configurator Modes	49
6.1.2 Device Modes	49
Easy Mode	51
7.1 Overview	51
7.2 What You Can Do	52
7.3 What You Need to Know	52
7.4 Navigation Panel	53
7.5 Network Map	53
7.6 Control Panel	54
7.6.1 Game Engine	55
7.6.2 Power Saving	55
7.6.3 Content Filter	57
7.6.4 Bandwidth MGMT	57
7.6.5 Firewall	58
7.6.6 Wireless Security	58
7.6.7 WPS	60
7.7 Status Screen in Easy Mode	61
Router Mode	62
8.1 Overview	62
8.2 What You Can Do	62
8.3 Status Screen	63
8.3.1 Navigation Panel	66
Access Point Mode	69
9.1 Overview	69
9.2 What You Can Do	69
9.3 What You Need to Know	69
9.3.1 Setting your Router to AP Mode	70
9.3.2 Accessing the Web Configurator in Access Point Mode	70
9.3.3 Configuring your WLAN, Bandwidth Management and Maintenance Settings	71
9.4 AP Mode Status Screen	72
9.5 LAN Screen	74
WISP Mode	76
10.1 Overview	76
10.2 What You Can Do	76
10.3 What You Need to Know	76
10.3.1 Setting your Router to WISP Mode	77
10.3.2 Accessing the Web Configurator in WISP Mode	77
10.4 WISP Mode Status Screen	78
10.5 Wireless LAN General Screen	80
10.5.1 Static WEP	82
10.5.2 WPA(2)-PSK	83
10.5.3 Advance Screen	84
10.5.4 Site Survey Screen	85
Tutorials	87
11.1 Overview	87
11.2 Connecting to the Internet from an Access Point	87
11.3 Configuring Wireless Security Using WPS	87
11.3.1 Push Button Configuration (PBC)	88
11.3.2 PIN Configuration	89
11.4 Enabling and Configuring Wireless Security (No WPS)	91
11.4.1 Configure Your Notebook	92
11.5 Connecting to USB Storage with the ZyXEL NetUSB Share Center Utility	94
11.5.1 Multiple Connections to the USB Device	94
11.6 Automatically Connecting to a USB Printer	96
Technical Reference	99
Wireless LAN	101
12.1 Overview	101
12.2 What You Can Do	101
12.3 What You Should Know	102
12.3.1 Wireless Security Overview	102
12.4 General Wireless LAN Screen	104
12.4.1 No Security	105
12.4.2 WEP Encryption	106
12.4.3 WPA-PSK/WPA2-PSK	108
12.5 MAC Filter	108
12.6 Wireless LAN Advanced Screen	109
12.7 Quality of Service (QoS) Screen	111
12.8 WPS Screen	112
12.9 WPS Station Screen	113
12.10 Scheduling Screen	114
12.11 WDS Screen	115
WAN	117
13.1 Overview	117
13.2 What You Can Do	117
13.3 What You Need To Know	117
13.3.1 Configuring Your Internet Connection	118
13.3.2 Multicast	119
13.4 Internet Connection	119
13.4.1 Ethernet Encapsulation	119
13.4.2 PPPoE Encapsulation	121
13.4.3 PPTP Encapsulation	123
13.4.4 L2TP Encapsulation	126
13.5 Advanced WAN Screen	128
13.6 IGMP Blocking Screen	129
LAN	131
14.1 Overview	131
14.2 What You Can Do	131
14.3 What You Need To Know	132
14.3.1 IP Pool Setup	132
14.3.2 LAN TCP/IP	132
14.3.3 IP Alias	132
14.4 LAN IP Screen	133
14.5 IP Alias Screen	133
DHCP Server	135
15.1 Overview	135
15.2 What You Can Do	135
15.3 General Screen	135
15.4 Advanced Screen	136
Network Address Translation (NAT)	139
16.1 Overview	139
16.2 What You Can Do	139
16.3 General NAT Screen	140
16.4 NAT Application Screen	140
16.5 NAT Advanced Screen	142
16.5.1 Trigger Port Forwarding Example	144
16.5.2 Two Points To Remember About Trigger Ports	144
Dynamic DNS	145
17.1 Overview	145
17.2 What You Can Do	145
17.3 What You Need To Know	145
17.4 Dynamic DNS Screen	145
Static Route	147
18.1 Overview	147
18.2 What You Can Do	147
18.3 IP Static Route Screen	148
RIP	151
19.1 Overview	151
19.2 What You Can Do	151
19.3 RIP Screen	151
Firewall	153
20.1 Overview	153
20.2 What You Can Do	153
20.3 What You Need To Know	154
20.4 General Firewall Screen	154
20.5 Services Screen	155
Content Filter	157
21.1 Overview	157
21.2 What You Can Do	157
21.3 What You Need To Know	157
21.3.1 Content Filtering Profiles	157
21.4 Content Filter Screen	158
Bandwidth Management	161
22.1 Overview	161
22.2 What You Can Do	161
22.3 What You Need To Know	162
22.4 General Screen	162
22.5 Advanced Screen	162
22.5.1 Rule Configuration: Application Rule Configuration	164
22.5.2 Rule Configuration: User Defined Service Rule Configuration	165
22.6 Monitor Screen	166
22.6.1 Predefined Bandwidth Management Services	167
Remote Management	168
23.1 Overview	168
23.2 What You Can Do	168
23.3 What You Need to Know	168
23.3.1 Remote Management and NAT	168
23.3.2 System Timeout	169
23.4 WWW Screen	169
Universal Plug-and-Play (UPnP)	171
24.1 Overview	171
24.2 What You Can Do	171
24.3 What You Need to Know	171
24.3.1 NAT Traversal	171
24.3.2 Cautions with UPnP	172
24.4 UPnP Screen	172
24.5 Technical Refereance	172
24.5.1 Using UPnP in Windows XP Example	172
24.5.2 Web Configurator Easy Access	175
Maintenance	179
25.1 Overview	179
25.2 What You Can Do	179
25.3 General Screen	179
25.4 Password Screen	180
25.5 Time Setting Screen	181
25.6 Firmware Upgrade Screen	182
25.7 Configuration Backup/Restore Screen	184
25.8 Reset/Restart Screen	185
25.9 System Operation Mode Overview	185
25.10 Sys OP Mode Screen	187
Troubleshooting	189
26.1 Power, Hardware Connections, and LEDs	189
26.2 Router Access and Login	190
26.3 Internet Access	191
26.4 Resetting the Router to Its Factory Defaults	193
26.5 Wireless Router/AP Troubleshooting	193
26.6 ZyXEL Share Center Utility Problems	194
Pop-up Windows, JavaScript and Java Permissions	197
IP Addresses and Subnetting	209
Setting Up Your Computer’s IP Address	219
Wireless LANs	247
Common Services	261
Legal Information	265

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Chapter 16 Network Address Translation (NAT)

NBG-419N v2 User’s Guide

142

16.5

NAT Advanced Screen

Some services use a dedicated range of ports on the client side and a dedicated range of ports on

the server side. With regular port forwarding you set a forwarding port in NAT to forward a service

(coming in from the server on the WAN) to the IP address of a computer on the client side (LAN).

The problem is that port forwarding only forwards a service to a single LAN IP address. In order to

use the same service on a different LAN computer, you have to manually replace the LAN

computer's IP address in the forwarding port with another LAN computer's IP address.

Trigger port forwarding solves this problem by allowing computers on the LAN to dynamically take

turns using the service. The Router records the IP address of a LAN computer that sends traffic to

the WAN to request a service with a specific port number and protocol (a "trigger" port). When the

Router's WAN port receives a response with a specific port number and protocol ("incoming" port),

the Router forwards the traffic to the LAN IP address of the computer that sent the request. After

that computer’s connection for that service closes, another computer on the LAN can use the

service in the same manner. This way you do not need to configure a new IP address each time you

want a different LAN computer to use the application.

To change your Router’s trigger port settings, click

Network > NAT

Advanced

. The screen

appears as shown.

Application Rules Summary

This is the number of an individual port forwarding server entry.

Active

This icon is turned on when the rule is enabled.

Name

This field displays a name to identify this rule.

Port

This field displays the port number(s).

Server IP

Address

This field displays the inside IP address of the server.

Modify

Click the

Edit

icon to display and modify an existing rule setting in the fields under

Add

Application Rule

Click the

Remove

icon to delete a rule.

Apply

Click

Apply

to save your changes back to the Router.

Reset

Click

Reset

to begin configuring this screen afresh.

Table 64

Network > NAT > Application (continued)

LABEL

DESCRIPTION