NetComm NB750 User manual

2 NB750 Load Balancing Router User Guide
YML817 Rev1
Contents
CHAPTER 1. INTRODUCTION ................................................................................. 4
1.1 Overview ........................................................................................ 4
1.2 Hardware ........................................................................................ 6
1.2.1 Front Panel View .............................................................................. 6
1.2.2 Rear Panel View ............................................................................... 7
1.2.3 Hardware Load Default ...................................................................... 7
1.3 Features ......................................................................................... 8
1.3.1 Software Feature .............................................................................. 8
1.3.3 How to configure router .................................................................. 12
CHAPTER 2. CONNECTION .................................................................................. 13
2.1 Connection Diagram ....................................................................... 13
2.2 Connection Procedure ..................................................................... 13
2.3 Prepare Computer TCP/IP Environment ............................................ 14
CHAPTER 3 CONFIGURATION .............................................................................. 16
3.1 Log on .......................................................................................... 16
3.2 Work Mode .................................................................................... 18
3.3 System Status ............................................................................... 20
3.3.1 Link Status .................................................................................... 20
3.3.2 Data Monitor ................................................................................. 21
3.4 WAN Configuration ......................................................................... 23
3.4.1 Dynamic IP Connect to CABLE MODEM .............................................. 25
3.4.2 PPPoE/Dial Up DSL Type ................................................................. 25
3.4.3 Static IP/Leased DSL Type ............................................................... 26
3.5 Bandwidth Usage Control ................................................................ 27
3.6 Configure LAN&DHCP...................................................................... 28
3.7 Routing Table ................................................................................ 29
3.7.1 Configure ..................................................................................... 29
3.7.2 Current Table ................................................................................. 30
3.8 Access Control ............................................................................... 31
3.8.1 Local IP Filtering (Gateway Mode only) .............................................. 31
3.8.2 Remote IP Filtering (Gateway Mode only) .......................................... 32
3.8.3 Intrusion Security .......................................................................... 33
3.8.4 DoS Defense ................................................................................. 33
3.8.5 URL Filtering .................................................................................. 35
3.9 QoS .............................................................................................. 36
3.10 Load Balance ................................................................................. 37
3.10.1 Mode ............................................................................................ 37
3.10.2 Special Application ......................................................................... 39
3.10.3 Special IP Assignment. .................................................................... 39
3.11 Advance ........................................................................................ 40
3.11.1 Remote Configure ......................................................................... 40
3.11.2 Virtual Server / VPN Pass Through /ALG options ................................. 41
3.11.3 DMZ Host ..................................................................................... 43
3.11.4 Multi-NAT ...................................................................................... 45

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3.11.5 IP Binding (Protocol Route Control) ................................................... 46
3.11.6 DDNS (Gateway Mode / Basic NAT Mode only) .................................... 48
3.11.7 Proxy ............................................................................................ 48
3.11.8 Mail Alert (Gateway Mode / Basic NAT Mode only) ............................... 49
3.11.9 Time (Gateway Mode / Basic NAT Mode only) ..................................... 50
3.11.10 System Log ................................................................................... 51
3.11.11 MAC Address Clone ......................................................................... 51
3.12 Administration ............................................................................... 53
3.12.1 Change Password ........................................................................... 53
3.12.2 Back Up & Restore .......................................................................... 53
3.12.3 Load Factory Default ....................................................................... 54
3.12.4 Display ........................................................................................ 54
3.13 Firmware Update ............................................................................ 55
3.14 Save & Reset ................................................................................. 58
Appendix A: TCP/IP Protocol Port Number List ....................................................... 59
Appendix B: Load Balancing Router Specification .................................................. 60
Appendix C: Cable Information ............................................................................ 65
Appendix D: Registration and Warranty Information .............................................. 67

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CHAPTER 1. INTRODUCTION
1.1 Overview
The Load Balancing Router provides two 10/100 Mbps Ethernet WAN ports and one 10/100
Mbps Ethernet LAN port. The WAN ports are used to connect to broadband modems, such
as an ADSL modem or CABLE modem, so the user can download or upload data at high
speed. The NB750 provides one LAN port to connect to a computer via a cable. You can
also connect the LAN port to a HUB/SWITCH device to extend the amount of connection
devices/users if necessary. Families with multiple PCs could share one ISP account to play
games against each other through the NB750.
Important Features:
• Allows many users to use it with a single user account
• Web configuration tool
• Multiple DMZ Host (PPPoE, FIX IP)
• Multiple Virtual Server
• Multiple NAT function
• Protocol Route Control (IP Binding Function, by IP & port number)
• Protocol Bandwidth Control (by application protocol port number)
• IP/URL Blocking
• User Bandwidth Control Function (by user IP address)
• H.323 VoIP ALG included
• Remote Configuration through Internet
• System Log
• Mail Alert
• Firewall
• Backup / Restore router configuration file from PC
• Display real time router configuration parameter
• Out-Bound Firmware

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Package Contents:
Your NB750 package includes the following items:
• 1 x CD-ROM containing the NB750 user’s
manual
• 1 x AC Adapter suitable for your electric
service
• 1 x Network cable with RJ-45 connectors for
LAN connection
When you open your package, make sure all of the above items are included and
not damaged. If any components are missing or damaged, please contact NetComm
immediately.
• 1 x NB750 Load Balancing Router

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1.2 Hardware
1.2.1 Front Panel View
LED Indicators
LEDs Indication
POWER On Power on
Off Power off
ALARM On System not working
Off Normal operation
WAN1 / WAN2 On Linked
Flash Data Transmitting
Off Disconnected or undetected
LAN 10M/100M On Linked
Flash Data Transmitting
Off Disconnected or undetected

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1.2.2 Rear Panel View
FG: Ground connection.
DC 5V: Connecting to AC adapter.
WAN: The NB750 provides two RJ45 type WAN ports for
connection to broadband transmission equipments
such as ADSL or CABLE Modem via a RJ45 cable.
LAN: The NB750 provides one RJ45 type LAN port for
connection to your network devices such as Hub/
Switch via the RJ45 cable. Using a HUB/Switch will
allow more PCs to connect with the NB750.
Factory Reset: Should the NB750 incur a system crash, press the
Factory Reset button to reload the factory default
value or reset it back to the latest configuration file.
1.2.3 Hardware Load Default
If you need to reset the NB750 to factory default values or load the latest configuration file, please
follow the description step by step to load the factory default settings or latest configuration file for
the device. Please be careful. Do not press the Factory Reset button unless you want to clear the
current data.
1. Plug in the power cord and then hold down the Factory Reset button for 2 seconds.
2. Release the Factory Reset button.
3. The NB750 will load the default settings or latest configuration file and complete a self-
test.
4. This completes the reset procedure.

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1.3 Features
1.3.1 Software Feature
In order to meet different application usage, you can configure this router in any of three
different working modes:
1. Gateway mode
2. Router mode
3. Basic NAT mode (NAT Table up to 5000 entries)
Each working mode includes different features:
Function
Mode
LAN to WAN
Throughput
NAT
Function
DMZ, DoS
Virtual Ser
IP Filtering
IP Domain PPPoE Dial
up
Gateway
Mode
Good Yes Yes Legal To
Illegal
Yes
Router Mode Best No No.... (1) Legal To
Legal (4)
No
Basic NAT
Mode (2)
Good Yes Yes…(3) Legal To
Illegal
Yes
(1) All NAT related functions will be disabled
(2) The purpose of this mode is to have both high through-put and NAT function.
(3) Simple NAT functions available
(4) Simulates a multi-LAN port router

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Working Mode / Function List
Function
Mode
Gateway Router Basic NAT
PPPoE/Dial Up DSL Type X X
Local IP Filtering X
Remote IP Filtering X
Intrusion Security X
Dos Defense X
URL Filtering X
Remote Configure X X X
Virtual Server X X
DMZ Host X X
Multi-NAT X X
IP Binding X X
Load Balance X X
Dynamic DNS X X
Mail Alert X X
Time Zone X X X
System Log X X X
Mac Address Clone X X X
Configure Proxy X X
Routing protocol X X X
DOD (PPPoE) X X
Bandwidth Usage Control X X
QoS X X

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1.3.2 Factory Default Value
Function Value
Default Enable Disable
Work Mode Gateway X
Router
Basic NAT
System Status Link Status X
Data Monitor X
WAN Configure Connect to Internet
Health Check X
WAN Type Dynamic IP
Schedule X
Bandwidth Usage
Control
X
Configure LAN
& DHCP
DHCP server X
Routing Table Static Route X
Dynamic Route X
Access Control Local IP Filtering X
Remote IP
Filtering
X
DoS Defense X (Some items)
URL Filtering X
Advance Remote Config X
Virtual Server
DMZ Host X
Multi-NAT X
IP Binding X
DDNS X
Proxy X
Mail Alert X
Time Zone X
System Log X
MAC Address
Clone
X

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Administration Password X
Backup &
Restore
X
Load Factory
Default
Load Default
Display X
Save & Reset X

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1.3.3 How to configure router
This equipment provides three working modes for various usages. In order to set the proper
parameters in each function/mode, you can follow this flow chart before you start to configure the
router.

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CHAPTER 2. CONNECTION
2.1 Connection Diagram
The NB750 provides one LAN port connected to your network devices such as a PC, HUB
or SWITCH via a RJ45 cable. Using a HUB/SWITCH allows more PCs to connect to the
NB750. WAN ports are used to connect your ADSL or CABLE Modem to the broadband
ISP.
For the RJ45 cable type, both WAN/LAN ports support the auto MDI/MDIX Function. You
can choose to use either crossover or straight type RJ-45 cable.
2.2 Connection Procedure
1. Plug in DC power adapter to Router.
2. Connect the Router WAN port RJ45 modular jack to ADSL/CABLE Modem Ethernet
port with the RJ45 cable.
3. Connect the Router LAN port RJ45 modular jack to HUB/SWITCH LAN port by RJ45
cable.
4. Connect PC LAN card port to HUB/SWITCH LAN port.
5. Connect FG to ground.
6. Plug in AC power cord to power source.

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2.3 Prepare Computer TCP/IP Environment
This section provides instructions for configuring the TCP/IP (Network) settings on your computer
to work with your NB750.
Windows® XP PCs
1. In the Windows task bar, click the Start button, and then click Control Panel.
2. Click on Network & Internet Connections icon. (Category mode only).
3. Click the Network Connections icon.
4. In the LAN or High-Speed Internet window, right-click on the icon corresponding to
your network interface card (NIC) and select Properties. (Often, this icon is labelled
Local Area Connection).
5. The Local Area Connection dialog box displays with a list of currently installed network
items. Ensure that the check box to the left of the item labelled Internet Protocol (TCP/
IP) is checked. Select Internet Protocol TCP/IP and click on Properties.
6. In the Internet Protocol (TCP/IP) Properties dialog box, click the radio button labelled
Obtain an IP address automatically. Also click the radio button labelled Obtain DNS
server address automatically.
7. Click OK twice to confirm your changes, and close the Control Panel.
Windows 2000 PCs
First, check for the IP protocol and, if necessary, install it:
1. In the Windows task bar, click the Start button, point to Settings, and then click
Control Panel.
2. Double-click the Network and Dial-up Connections icon.
3. In the Network and Dial-up Connections window, right-click the Local Area
Connection icon, and then select Properties.
4. In the Local Area Connection Properties dialog box, select Internet Protocol (TCP/IP),
and then click Properties
5. In the Internet Protocol (TCP/IP) Properties dialog box, click the radio button
labelled Obtain an IP address automatically. Also click the radio button labelled Obtain
DNS server address automatically.
6. Click OK twice to confirm and save your changes, and then close the Control Panel.
Windows Me PCs
1. In the Windows task bar, click the Start button, point to Settings, and then click
Control Panel.
2. Click on View All Control Panel Options.
3. Double-click the Network icon.
4. The Network Properties dialog box displays with a list of currently installed network
components. If the list includes Internet Protocol (TCP/IP), then the protocol has already
been enabled. Skip to step 10.
5. If Internet Protocol (TCP/IP) does not display as an installed component, click Add…
6. In the Select Network Component Type dialog box, select Protocol, and then click
Add…
7. Select Microsoft in the Manufacturers box.

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8. Select Internet Protocol (TCP/IP) in the Network Protocols list, and then click OK.
You may be prompted to install files from your Windows ME installation CD or other
media. Follow the instructions to install the files. If prompted, click OK to restart your
computer with the new settings.
Next, configure the PC to accept IP information assigned by the modem:
9. Follow steps 1 – 4 above..
10. In the Network Properties dialog box, select TCP/IP, and then click Properties.
If you have multiple TCP/IP listings, select the listing associated with your network card
or adapter.
11. In the TCP/IP Settings dialog box, click the radio button labelled Obtain an IP address
automatically.
12. Click OK twice to confirm and save your changes, and then close the Control Panel.
Windows 95, 98 PCs
First, check for the IP protocol and, if necessary, install it:
1. In the Windows task bar, click the Start button, point to Settings, and then click
Control Panel.
2. Double-click the Network icon.
3. The Network dialog box displays with a list of currently installed network components.
If the list includes TCP/IP, and then the protocol has already been enabled. Skip to step
9.
4. If TCP/IP does not display as an installed component, click Add… The Select Network
Component Type dialog box displays.
5. Select Protocol, and then click Add… The Select Network Protocol dialog box
displays.
6. Click on Microsoft in the Manufacturers list box, and then click TCP/IP in the
Network Protocols list box.
7. Click OK to return to the Network dialog box, and then click OK again. You may
be prompted to install files from your Windows 95/98 installation CD. Follow the
instructions to install the files.
8. Click OK to restart the PC and complete the TCP/IP installation.
Next, configure the PCs to accept IP information assigned by the Modem:
9. Follow steps 1 – 3 above.
10. Select the network component labelled TCP/IP, and then click Properties. If you have
multiple TCP/IP listings, select the listing associated with your network card or adapter.
11. In the TCP/IP Properties dialog box, click the IP Address tab.
12. Click the radio button labelled Obtain an IP address automatically.
13. Click OK twice to confirm and save your changes. You will be prompted to restart
Windows.
14. Click Yes.

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CHAPTER 3 CONFIGURATION
3.1 Log on
Type the default IP address 192.168.1.1 into the address bar of the IE browser. Then enter
your user name and password. The default user name and password are both admin.
Figure 1 Login
Web configuration display includes:
• Welcome
• Work Mode
• System Status,
• WAN Configure
• Bandwidth Usage Control
• Configure LAN&DHCP
• Routing Table
• Access Control
• QoS
• Load Balance
• Advance
• Administration
• Firmware Update
• Save & Reset
The welcome page and various configuration menus are displayed overleaf.

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Figure 2 Welcome
You can select various functions listed in the left-hand side of the Welcome display. You are
advised to change your password immediately. Advice on managing your password can be
found in the section 3.12.1.

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3.2 Work Mode
In order to meet different application usage, this router can be configured in three different
working modes, as outlined below.
1. Gateway mode
2. Router mode
3. Basic NAT mode
Figure 3 Work Mode
Each working mode includes different features:
Function
Mode
LAN to WAN
Through put
NAT
Function
DMZ, Dos
Virtual Ser
IP Filtering
IP Domain PPPoE Dial
up
Gateway
Mode
Good Yes Yes Legal To
Illegal
Yes
Router Mode Best No No.... (1) Legal To
Legal (4)
No
Basic NAT
Mode (2)
Good Yes Yes…(3) Legal To
Illegal
Yes
(1) All NAT related functions will be disabled
(2) The purpose of this mode is to have both high through-put and NAT function.
(3) Simple NAT function available
(4) Simulates a multi-LAN port router
Note: Once you have selected the “Work Mode” and click “OK”, you will need to
power off the NB750 by unplugging the power adapter and then powering
it on again for the settings to take effect.

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Working Mode / Function List
Function
Mode
Gateway Router Basic NAT
PPPoE/Dial Up DSL Type X X
Local IP Filtering X
Remote IP Filtering X
Intrusion Security X
Dos Defense X
URL Filtering X
Remote Configure X X X
Virtual Server X X
DMZ Host X X
Multi-NAT X X
IP Binding X X
Load Balance X X
Dynamic DNS X X
Mail Alert X X
Time Zone X X X
System Log X X X
Mac Address Clone X X X
Configure Proxy X X
Routing protocol X X X
DOD (PPPoE) X X
Bandwidth Usage Control X X
QoS X X

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3.3 System Status
3.3.1 Link Status
You can get the following information in the Link Status window:
• LAN Status,
• WAN Status,
• Firmware Information,
• DHCP TABLE.
Figure 4 Link Status
LAN Status: Shows the information of MAC Address, IP Address,
Subnet Mask and DHCP Status (Enable/Disable).
WAN Status: Shows the information of MAC Address, IP Address,
and Subnet Mask on each or all WAN ports.
Firmware version: Version of software and its release date.
DHCP TABLE: Shows the information of MAC Address and IP
Address.