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Technical Reference, 14.5.1 NATPort Forwarding: Services and Port Numbers

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Chapter 14 NAT Table 52 Network > NAT > Port Trigger (continued) LABEL DESCRIPTION Incoming Incoming is a port (or a range of ports) that a server on the WAN uses when it sends out a particular service. The NBG6616 forwards the traffic with this port (or range of ports) to the client computer on the LAN that requested the service. Port Type a port number or the starting port number in a range of port numbers. End Port Type a port number or the ending port number in a range of port numbers. Trigger The trigger port is a port (or a range of ports) that causes (or triggers) the NBG6616 to record the IP address of the LAN computer that sent the traffic to a server on the WAN. Port Type a port number or the starting port number in a range of port numbers. End Port Type a port number or the ending port number in a range of port numbers. Apply Click Apply to save your changes back to the NBG6616. Cancel Click Cancel to begin configuring this screen afresh. 14.5 Technical Reference The following section contains additional technical information about the NBG6616 features described in this chapter. 14.5.1 NATPort Forwarding: Services and Port Numbers A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP, that you can make accessible to the outside world even though NAT makes your whole inside network appear as a single machine to the outside world. Use the Port Forwarding 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. 14.5.2 NAT Port Forwarding Example Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (A in the example), port 80 to another (B in the example) and assign a default server IP address of 192.168.1.35 to a third (C in the example). You assign the LAN IP addresses and the ISP assigns the WAN IP address. The NAT network appears as a single host on the Internet. NBG6616 User's Guide 121

Section	Page
NBG6616	1
Contents Overview	3
Table of Contents	4
User’s Guide	11
Introduction	12
1.1 Overview	12
1.2 Applications	12
1.3 Ways to Manage the NBG6616	12
1.4 Good Habits for Managing the NBG6616	13
1.5 Resetting the NBG6616	13
1.5.1 How to Use the RESET Button	13
1.6 The WPS Button	13
1.7 LEDs	14
1.8 Wall Mounting	15
Introducing the Web Configurator	17
2.1 Overview	17
2.2 Accessing the Web Configurator	17
2.2.1 Login Screen	17
2.2.2 Password Screen	18
Connection Wizard	20
3.1 Overview	20
3.2 Accessing the Wizard	20
3.3 Connect to Internet	21
3.3.1 Connection Type: IPoE	22
3.3.2 Connection Type: PPPoE	24
3.4 Router Password	25
3.5 Wireless Security	26
3.5.1 Wireless Security: No Security	26
3.5.2 Wireless Security: WPA2-PSK	27
NBG6616 Modes	30
4.1 Overview	30
4.1.1 Web Configurator Modes	30
4.1.2 Device Modes	30
Easy Mode	31
5.1 Overview	31
5.2 What You Can Do	32
5.3 What You Need to Know	32
5.4 Navigation Panel	32
5.5 Network Map	33
5.6 Control Panel	34
5.6.1 Game Engine	35
5.6.2 Power Saving	35
5.6.3 Parental Control	36
5.6.4 Bandwidth MGMT	37
5.6.5 Firewall	38
5.6.6 Wireless Security	38
5.6.7 WPS	39
5.7 Status Screen in Easy Mode	40
Router Mode	42
6.1 Overview	42
6.2 Router Mode Status Screen	42
6.2.1 Navigation Panel	45
Access Point Mode	49
7.1 Overview	49
7.2 What You Can Do	49
7.3 What You Need to Know	49
7.3.1 Setting your NBG6616 to AP Mode	50
7.3.2 Accessing the Web Configurator in Access Point Mode	50
7.3.3 Configuring your WLAN and Maintenance Settings	51
7.4 AP Mode Status Screen	51
7.4.1 Navigation Panel	53
7.5 LAN Screen	53
Tutorials	56
8.1 Overview	56
8.2 Set Up a Wireless Network Using WPS	56
8.2.1 Push Button Configuration (PBC)	56
8.2.2 PIN Configuration	57
8.3 Connect to NBG6616 Wireless Network without WPS	58
8.3.1 Configure Your Notebook	60
8.4 Using Multiple SSIDs on the NBG6616	62
8.4.1 Configuring Security Settings of Multiple SSIDs	63
Technical Reference	68
Monitor	69
9.1 Overview	69
9.2 What You Can Do	69
9.3 The Log Screen	69
9.3.1 View Log	69
9.4 DHCP Table	70
9.5 Packet Statistics	71
9.6 WLAN Station Status	72
WAN	74
10.1 Overview	74
10.2 What You Can Do	74
10.3 What You Need To Know	74
10.3.1 Configuring Your Internet Connection	75
10.4 Internet Connection	76
10.4.1 IPoE Encapsulation	76
10.4.2 PPPoE Encapsulation	79
10.5 Advanced WAN Screen	82
Wireless LAN	84
11.1 Overview	84
11.1.1 What You Can Do	85
11.1.2 What You Should Know	85
11.2 General Wireless LAN Screen	89
11.3 Wireless Security	91
11.3.1 No Security	91
11.3.2 WEP Encryption	92
11.3.3 WPA-PSK/WPA2-PSK	94
11.3.4 WPA/WPA2	95
11.4 More AP Screen	97
11.4.1 More AP Edit	98
11.5 MAC Filter Screen	100
11.6 Wireless LAN Advanced Screen	102
11.7 Quality of Service (QoS) Screen	102
11.8 WPS Screen	103
11.9 WPS Station Screen	105
11.10 Scheduling Screen	105
LAN	107
12.1 Overview	107
12.2 What You Can Do	107
12.3 What You Need To Know	107
12.3.1 IP Alias	108
12.4 LAN IP Screen	108
12.5 IP Alias Screen	109
12.6 IPv6 LAN Screen	110
DHCP Server	111
13.1 Overview	111
13.1.1 What You Can Do	111
13.1.2 What You Need To Know	111
13.2 DHCP Server General Screen	111
13.3 DHCP Server Advanced Screen	112
13.4 DHCP Client List Screen	114
NAT	116
14.1 Overview	116
14.1.1 What You Can Do	116
14.2 General	117
14.3 Port Forwarding Screen	117
14.3.1 Port Forwarding Edit Screen	119
14.4 Port Trigger Screen	120
14.5 Technical Reference	121
14.5.1 NATPort Forwarding: Services and Port Numbers	121
14.5.2 NAT Port Forwarding Example	121
14.5.3 Trigger Port Forwarding	122
14.5.4 Trigger Port Forwarding Example	122
14.5.5 Two Points To Remember About Trigger Ports	123
DDNS	124
15.1 Overview	124
15.1.1 What You Need To Know	124
15.2 General	124
Static Route	126
16.1 Overview	126
16.2 IP Static Route Screen	126
16.2.1 Add/Edit Static Route	127
Firewall	129
17.1 Overview	129
17.1.1 What You Can Do	129
17.1.2 What You Need To Know	129
17.2 General Screen	130
17.3 Services Screen	131
Content Filtering	134
18.1 Overview	134
18.2 Content Filter	134
Parental Control	136
19.1 Overview	136
19.1.1 What You Need To Know	136
19.2 Parental Control Screen	136
19.2.1 Add/Edit a Parental Control Rule	137
19.2.2 Add/Edit a Service	139
19.3 Technical Reference	140
19.3.1 Customizing Keyword Blocking URL Checking	140
IPv6 Firewall	142
20.1 Overview	142
20.2 IPv6 Firewall Screen	142
Bandwidth Management	145
21.1 Overview	145
21.2 What You Can Do	145
21.3 What You Need To Know	146
21.4 General Screen	146
21.5 Advanced Screen	146
21.5.1 Rule Configuration: Application Rule Configuration	148
21.5.2 Rule Configuration: User Defined Service Rule Configuration	149
21.5.3 Predefined Bandwidth Management Services	151
Remote Management	152
22.1 Overview	152
22.2 What You Can Do in this Chapter	152
22.3 What You Need to Know	152
22.3.1 Remote Management and NAT	153
22.3.2 System Timeout	153
22.4 WWW Screen	153
22.5 Telnet Screen	154
22.6 Wake On LAN Screen	154
Universal Plug-and-Play (UPnP)	156
23.1 Overview	156
23.2 What You Need to Know	156
23.2.1 NAT Traversal	156
23.2.2 Cautions with UPnP	156
23.3 UPnP Screen	157
23.4 Technical Reference	157
23.4.1 Using UPnP in Windows XP Example	157
23.4.2 Web Configurator Easy Access	159
USB Media Sharing	162
24.1 Overview	162
24.2 What You Can Do	163
24.3 What You Need To Know	163
24.4 Before You Begin	164
24.5 DLNA Screen	165
24.6 SAMBA Screen	165
24.7 FTP Screen	167
24.8 Example of Accessing Your Shared Files From a Computer	168
24.8.1 Use Windows Explorer to Share Files	168
24.8.2 Use FTP to Share Files	170
Maintenance	172
25.1 Overview	172
25.2 What You Can Do	172
25.3 General Screen	172
25.4 Password Screen	173
25.5 Time Setting Screen	174
25.6 Firmware Upgrade Screen	175
25.7 Configuration Backup/Restore Screen	177
25.8 Restart Screen	178
25.9 Language Screen	178
25.10 System Operation Mode Overview	179
25.11 Sys OP Mode Screen	180
Troubleshooting	182
26.1 Overview	182
26.2 Power, Hardware Connections, and LEDs	182
26.3 NBG6616 Access and Login	183
26.4 Internet Access	184
26.5 Resetting the NBG6616 to Its Factory Defaults	186
26.6 Wireless Connections	186
26.7 USB Device Problems	188
Pop-up Windows, JavaScript and Java Permissions	189
Setting Up Your Computer’s IP Address	198
Common Services	224
Legal Information	227
Customer Support	232

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Chapter 14 NAT

NBG6616 User’s Guide

121

14.5

Technical Reference

The following section contains additional technical information about the NBG6616 features

described in this chapter.

14.5.1

NATPort Forwarding: Services and Port Numbers

A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP,

that you can make accessible to the outside world even though NAT makes your whole inside

network appear as a single machine to the outside world.

Use the

Port Forwarding

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.

14.5.2

NAT Port Forwarding Example

Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (

in the example),

port 80 to another (

in the example) and assign a default server IP address of 192.168.1.35 to a

third (

in the example). You assign the LAN IP addresses and the ISP assigns the WAN IP address.

The NAT network appears as a single host on the Internet.

Incoming

Incoming is a port (or a range of ports) that a server on the WAN uses when it sends out

a particular service. The NBG6616 forwards the traffic with this port (or range of ports) to

the client computer on the LAN that requested the service.

Port

Type a port number or the starting port number in a range of port numbers.

End Port

Type a port number or the ending port number in a range of port numbers.

Trigger

The trigger port is a port (or a range of ports) that causes (or triggers) the NBG6616 to

record the IP address of the LAN computer that sent the traffic to a server on the WAN.

Port

Type a port number or the starting port number in a range of port numbers.

End Port

Type a port number or the ending port number in a range of port numbers.

Apply

Click

Apply

to save your changes back to the NBG6616.

Cancel

Click

Cancel

to begin configuring this screen afresh.

Table 52

Network > NAT > Port Trigger (continued)

LABEL

DESCRIPTION