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NAT Application Screen

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Chapter 10 Network Address Translation Table 47 Network > NAT > General (continued) LABEL Server IP Address DESCRIPTION In addition to the servers for specified services, NAT supports a default server. A default server receives packets from ports that are not specified in the Application screen. Apply Reset If you do not assign a Default Server IP address, the NBG-416N discards all packets received for ports that are not specified in the Application screen or remote management. Click Apply to save your changes back to the NBG-416N. Click Reset to begin configuring this screen afresh. 10.4 NAT Application Screen Use the Application screen to forward incoming service requests to the server(s) on your local network. You may enter a single port number or a range of port numbers to be forwarded, and the local IP address of the desired server. The port number identifies a service; for example, web service is on port 80 and FTP on port 21. In some cases, such as for unknown services or where one server can support more than one service (for example both FTP and web service), it might be better to specify a range of port numbers. In addition to the servers for specified services, NAT supports a default server. A service request that does not have a server explicitly designated for it is forwarded to the default server. If the default is not defined, the service request is simply discarded. Note: Many residential broadband ISP accounts do not allow you to run any server processes (such as a Web or FTP server) from your location. Your ISP may periodically check for servers and may suspend your account if it discovers any active services at your location. If you are unsure, refer to your ISP. Port forwarding allows you to define the local servers to which the incoming services will be forwarded. To change your NBG-416N's port forwarding settings, click Network > NAT > Application. The screen appears as shown. Note: If you do not assign a Default Server IP address in the NAT > General screen, the NBG-416N discards all packets received for ports that are not specified in this screen or remote management. NBG-416N User's Guide 115

Section	Page
NBG-416N	1
Contents Overview	3
Table of Contents	5
User’s Guide	11
Introduction	13
1.1 Overview	13
1.2 Securing the NBG-416N	14
1.3 LEDs	15
1.4 The WPS Button	16
1.5 Wall Mounting	16
The Web Configurator	19
2.1 Overview	19
2.2 Accessing the Web Configurator	19
2.3 Resetting the NBG-416N	21
2.3.1 Using the RESET Button	21
Connection Wizard	23
3.1 Wizard Setup	23
3.2 Connection Wizard: STEP 1: System Information	24
3.2.1 System Name	24
3.2.2 Domain Name	25
3.3 Connection Wizard: STEP 2: Wireless LAN	26
3.3.1 WPA-PSK or WPA2-PSK Security	27
3.4 Connection Wizard: STEP 3: Internet Configuration	27
3.4.1 Ethernet Connection	28
3.4.2 PPPoE Connection	28
3.4.3 PPTP Connection	30
3.4.4 Your IP Address	31
3.4.5 WAN IP Address Assignment	32
3.4.6 IP Address and Subnet Mask	32
3.4.7 DNS Server Address Assignment	33
3.4.8 WAN IP and DNS Server Address Assignment	34
3.4.9 WAN MAC Address	35
3.5 Connection Wizard Complete	36
Modes	37
4.1 Overview	37
4.2 Setting your NBG-416N to Router Mode	39
4.2.1 Status Screen (Router Mode)	40
4.2.2 Router Mode Navigation Panel	45
4.3 Setting your NBG-416N to AP Mode	47
4.3.1 Status Screen (AP Mode)	48
4.3.2 AP Navigation Panel	50
4.4 Setting your NBG-416N to Universal Repeater Mode	52
4.4.1 Status Screen (Universal Repeater Mode)	53
4.4.2 Universal Repeater Navigation Panel	55
4.5 Setting your NBG-416N to Client Bridge Mode	56
4.5.1 Status Screen (Client Bridge Mode)	57
4.5.2 Client Bridge Navigation Panel	59
Tutorials	61
5.1 Overview	61
5.2 How to Connect to the Internet from an AP	61
5.2.1 Configure Wireless Security Using WPS on both your NBG-416N and Wireless Client	61
5.3 Enable and Configure Wireless Security without WPS on your NBG-416N	65
Technical Reference	69
Wireless LAN	71
6.1 Overview	71
6.2 What You Can Do	72
6.3 What You Should Know	73
6.3.1 Wireless Security Overview	73
6.4 General Wireless LAN Screen	75
6.4.1 No Security	77
6.4.2 WEP Encryption	78
6.4.3 WPA-PSK/WPA2-PSK	80
6.5 MAC Filter	81
6.6 Wireless LAN Advanced Screen	83
6.7 Quality of Service (QoS) Screen	85
6.8 WPS Screen	86
6.9 WPS Station Screen	87
6.10 Scheduling Screen	87
6.11 AP Select Screen	89
6.12 WLAN Info Screen	90
WAN	91
7.1 Overview	91
7.2 What You Need To Know	91
7.2.1 Configuring Your Internet Connection	92
7.3 Internet Connection	93
7.3.1 Ethernet Encapsulation	93
7.3.2 PPPoE Encapsulation	95
7.3.3 PPTP Encapsulation	97
LAN	101
8.1 Overview	101
8.2 What You Need To Know	102
8.2.1 IP Pool Setup	102
8.2.2 LAN TCP/IP	102
8.3 LAN IP Screen	103
DHCP Server	105
9.1 Overview	105
9.2 What You Can Do	105
9.3 What You Need To Know	105
9.4 General Screen	106
9.5 Advanced Screen	106
9.6 Client List Screen	108
Network Address Translation	111
10.1 Overview	111
10.2 What You Can Do	112
10.2.1 What You Need To Know	112
10.3 General NAT Screen	114
10.4 NAT Application Screen	115
10.5 Technical Reference	117
10.5.1 NAT Port Forwarding: Services and Port Numbers	117
10.5.2 NAT Port Forwarding Example	118
Dynamic DNS	119
11.1 Overview	119
11.2 Dynamic DNS Screen	119
Firewall	121
12.1 Overview	121
12.2 What You Can Do	121
12.3 What You Need To Know	122
12.3.1 About the NBG-416N Firewall	122
12.3.2 VPN Pass Through Features	122
12.4 General Firewall Screen	123
12.5 Services Screen	123
Remote Management	125
13.1 Overview	125
13.1.1 Remote Management Limitations	126
13.1.2 Remote Management and NAT	126
13.1.3 System Timeout	126
13.2 WWW Screen	127
Universal Plug-and-Play (UPnP)	129
14.1 Overview	129
14.2 What You Need to Know	129
14.3 Configuring UPnP	130
14.3.1 Using UPnP in Windows XP Example	131
14.3.2 Web Configurator Easy Access	133
System	135
15.1 Overview	135
15.2 What You Can Do	135
15.3 System General Screen	135
15.4 Time Setting Screen	137
Logs	141
16.1 Overview	141
16.2 What You Need to Know	141
16.3 View Log Screen	141
Tools	143
17.1 Overview	143
17.2 What You Can Do	143
17.3 Firmware Upload Screen	143
17.4 Configuration Screen	146
17.4.1 Backup Configuration	146
17.4.2 Restore Configuration	146
17.4.3 Back to Factory Defaults	147
17.5 Restart Screen	148
Sys OP Mode	149
18.1 Overview	149
18.2 General Screen	149
Language	153
19.1 Language Screen	153
Troubleshooting	155
20.1 Power, Hardware Connections, and LEDs	155
20.2 NBG-416N Access and Login	156
20.3 Internet Access	158
20.4 Resetting the NBG-416N to Its Factory Defaults	159
20.5 Wireless Problems	160
IP Addresses and Subnetting	161
Setting Up Your Computer’s IP Address	171
Pop-up Windows, JavaScripts and Java Permissions	199
Wireless LANs	209
Common Services	223
Legal Information	227

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Chapter 10 Network Address Translation

NBG-416N User’s Guide

115

10.4

NAT Application Screen

Use the

Application

screen to forward incoming service requests to the server(s)

on your local network. You may enter a single port number or a range of port

numbers to be forwarded, and the local IP address of the desired server. The port

number identifies a service; for example, web service is on port 80 and FTP on

port 21. In some cases, such as for unknown services or where one server can

support more than one service (for example both FTP and web service), it might

be better to specify a range of port numbers.

In addition to the servers for specified services, NAT supports a default server. A

service request that does not have a server explicitly designated for it is forwarded

to the default server. If the default is not defined, the service request is simply

discarded.

Note: Many residential broadband ISP accounts do not allow you to run any server

processes (such as a Web or FTP server) from your location. Your ISP may

periodically check for servers and may suspend your account if it discovers any

active services at your location. If you are unsure, refer to your ISP.

Port forwarding allows you to define the local servers to which the incoming

services will be forwarded. To change your NBG-416N’s port forwarding settings,

click

Network > NAT

Application

. The screen appears as shown.

Note: If you do not assign a

Default Server

IP address

in the

NAT >

General

screen,

the NBG-416N discards all packets received for ports that are not specified in

this screen or remote management.

Server IP

Address

In addition to the servers for specified services, NAT supports a default

server. A default server receives packets from ports that are not

specified in the

Application

screen.

If you do not assign a

Default

Server

IP address

, the NBG-416N

discards all packets received for ports that are not specified in the

Application

screen or remote management.

Apply

Click

Apply

to save your changes back to the NBG-416N.

Reset

Click

Reset

to begin configuring this screen afresh.

Table 47

Network > NAT > General (continued)

LABEL

DESCRIPTION