Black Box LRB500A User manual

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 2001. Black Box Corporation. All rights reserved.

CUSTOMER
SUPPORT
INFORMATION
Order toll-free in the U.S.: Call 877-877-BBOX outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Bla k Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.bla kbox. om • E-mail: info@bla kbox. om
AUGUST 2001
LRB500A
Net A ess Broadband Router
w/4-Port Swit h
Users’ Manual

1
FCC AND IC RFI STATEMENTS
FEDERAL COMMUNICATIONS COMMISSION
and INDUSTRY CANADA
RADIO FREQUENCY INTERFERENCE STATEMENTS
Class B Digital Device. This equipment has been tested and found to comply with
the limits for a Class B computing device pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful
interference in a residential installation. However, there is no guarantee that
interference will not occur in a particular installation. This equipment generates,
uses, and can radiate radio frequency energy, and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. If this equipment does cause harmful interference to radio or
telephone reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
• Consult an experienced radio/TV technician for help.
Caution:
Changes or modifications not expressl approved b the part
responsible for compliance could void the user’s authorit to operate
the equipment.
To meet FCC requirements, shielded cables and power cords are required to
connect this device to a personal computer or other Class B certified device.
This digital apparatus does not exceed the Class B limits for radio noise emission from digital
apparatus set out in the Radio Interference Regulation of Industry Canada.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de classe B prescrites dans le Règlement sur le brouillage
radioélectrique publié par Industrie Canada.

2
NET ACCESS BROADBAND ROUTER W/4-PORT SWITCH USERS’ MANUAL
NORMAS OFICIALES MEXICANAS (NOM)
ELECTRICAL SAFETY STATEMENT
INSTRUCCIONES DE SEGURIDAD
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de
que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca
de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc..
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que
sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea
recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá
a lo descrito en las instrucciones de operación. Todo otro servicio deberá ser
referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no
interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá,
alfombra o superficie similar puede bloquea la ventilación, no se debe colocar
en libreros o gabinetes que impidan el flujo de aire por los orificios de
ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor
como radiadores, registros de calor, estufas u otros aparatos (incluyendo
amplificadores) que producen calor.
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del
tipo descrito en el instructivo de operación, o como se indique en el aparato.

3
NOM STATEMENT
12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización
del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no
sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen del
aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas
de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no sea
usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su
desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.

4
NET ACCESS BROADBAND ROUTER W/4-PORT SWITCH USERS’ MANUAL
TRADEMARKS USED IN THIS MANUAL
DEC™ is a trademark of Digital Equipment Corporation.
Intel®is a registered trademark of Intel Corporation.
IPX™ is a trademark and Novell®and NetWare®are registered trademarks of
Novell Incorporated.
Microsoft®, Windows®, and Windows NT®are registered trademarks of Microsoft
Corporation.
UL®is a registered trademark of Underwriters Laboratories Incorporated.
Unix®is a registered trademark of UNIX System Laboratories, Inc.
Xerox®is a registered trademark of Xerox Corporation.
Any other trademarks mentioned in this manual are acknowledged to be the property of the
trademark owners.

5
CONTENTS
Contents
Chapter Page
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1 Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 Back Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3 Typical Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3.1 Connecting a Remote Site via a Cable Modem. . . . . . . . . . . . . . 14
2.3.2 Connecting a Local Site by Segmenting the LAN. . . . . . . . . . . . 15
2.3.3 Connecting a Local Site to the Internet . . . . . . . . . . . . . . . . . . . 15
3. Hardware Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.2 What the Package Includes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.3 Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4. Software Installation and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1 Software Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2 Using the Setup Wizard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3 Testing Your Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5. Telnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.1 Starting a Telnet Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2 Using the Telnet Server Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6. Broadband Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.1 General Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.1.1 LAN Ethernet Segment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.1.2 WAN Ethernet Segment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.1.3 Async Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.2 Port Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
6.2.1 Edit Login for Remote Access . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
6.2.2 Modem String Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.2.3 Dial-Up/Hang-Up Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6.3 LAN DHCP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.3.1 IP Address Pool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
6.3.2 IP Address Mapping Reservation . . . . . . . . . . . . . . . . . . . . . . . . . 70
6.4 Routing Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
6.5 Filter Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

6
NET ACCESS BROADBAND ROUTER W/4-PORT SWITCH USERS’ MANUAL
Contents (continued)
Chapter Page
6.6 Refresh Device List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
6.7 Device Name and Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
6.8 Save Settings to File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
6.9 Load Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
6.10 Upgrade Firmware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
6.11 General Diagnostic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
7. Router Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
7.1 Running Router Monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
7.2 Refresh Device List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
7.3 Test Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
7.4 Terminate Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
7.5 Save to File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
7.6 IP Address/Name. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
7.7 Event Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
7.8 TCP/IP Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
7.9 Time Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
7.10 Status Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
7.11 Statistics Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
8. LAN Client Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
8.1 Setting Up Remote Access Clients . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
8.2 Accessing a Windows NT Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
8.2.1 Adding the Dial-Up Adapter (NT Server Connection) . . . . . . . 96
8.2.2 Adding TCP/IP (NT Server Connection). . . . . . . . . . . . . . . . . . 97
8.2.3 Adding Client for Microsoft Network
(NT Server Connection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.2.4 Adding File and Print Sharing for Microsoft Networks
(NT Server Connection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.2.5 Set Your Primary Network Logon (NT Server Connection) . . . 98
8.2.6 Set-Up Properties of Components (NT Server Connection). . . 98
8.2.7 Make Your New Connection (NT Server Connection) . . . . . . . 99
8.2.8 Set Dial-Up Type (NT Server Connection). . . . . . . . . . . . . . . . 100
8.2.9 Dial Into Your Network (NT Server Connection) . . . . . . . . . . 100
8.3 Accessing a Novell Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
8.3.1 Adding the Dial-Up Adapter (Novell Server Connection). . . . 101
8.3.2 Adding IPX/SPX (Novell Server Connection). . . . . . . . . . . . . 101

7
CONTENTS
Contents (continued)
Chapter Page
8.3.3 Adding Client for NetWare Networks
(Novell Server Connection). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
8.3.4 Set-Up Properties of Components
(Novell Server Connection). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
8.3.5 Set Your Primary Network Logon (Novell Server Connection)103
8.3.6 Set Your Access Control (Novell Sever Connection) . . . . . . . . 103
8.3.7 Make Your New Connection (Novell Server Connection). . . . 103
8.3.8 Set Dial-Up Type (Novell Server Connection) . . . . . . . . . . . . . 104
8.3.9 Dial Into Your Network (Novell Server Connection). . . . . . . . 104
8.4 Accessing a Windows NT Server and a Novell NetWare Server . . . 105
8.4.1 Adding the Dial-Up Adapter and a Novell NetWare Server. . . 105
8.4.2 Adding TCP/IP (Novell/NT Server Connection) . . . . . . . . . . 105
8.4.3 Adding Client for Microsoft Networks
(Novell/NT Server Connection). . . . . . . . . . . . . . . . . . . . . . . . . 106
8.4.4 Adding File and Print Sharing for Microsoft Networks
(Novell/NT Server Connection). . . . . . . . . . . . . . . . . . . . . . . . . 106
8.4.5 Adding IPX/SPX (Novell/NT Server Connection). . . . . . . . . 106
8.4.6 Adding Client for NetWare Networks (Novell/NT Server
Connection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
8.4.7 Set Your Primary Network Logon (Novell/NT Server
Connection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
8.4.8 Set-Up Properties of Components (Novell/NT Server
Connection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
8.4.9 Make Your New Connection
(NT/Novell Server Connection). . . . . . . . . . . . . . . . . . . . . . . . . 109
8.4.10 Set Dial-Up Type (NT/Novell Server Connection) . . . . . . . . 110
8.4.11 Dial Into Your Network (NT/Novell Server Connection). . . 110
8.5 Accessing a Unix Server. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
8.5.1 Adding the Dial-Up Adapter (Unix Server Connection). . . . . 111
8.5.2 Adding TCP/IP (Unix Server Connection) . . . . . . . . . . . . . . . 111
8.5.3 Set-Up Properties of Components
(Unix Server Connection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
8.5.4 Make Your New Connection (Unix Server Connection). . . . . 112
8.5.5 Set Dial-Up Type (Unix Server Connection) . . . . . . . . . . . . . . 113
8.5.6 Dial Into Your Network (Unix Server Connection) . . . . . . . . . 113
8.6 Make New Connection (Windows 2000 Only) . . . . . . . . . . . . . . . . 113

8
NET ACCESS BROADBAND ROUTER W/4-PORT SWITCH USERS’ MANUAL
Contents (continued)
Chapter Page
9. LAN-to-LAN Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
9.1 Setting Up a Windows Machine to Share Files . . . . . . . . . . . . . . . . 115
9.2 Using the Find Computer Command. . . . . . . . . . . . . . . . . . . . . . . . 116
9.3 Using LMHosts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
10. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
10.1 Problems/Solutions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
10.2 Calling Black Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
10.3 Shipping and Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Appendix A: Tools for Your Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
A.1 Broadband Monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
A.2 PING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
A.3 WINIPCFG and IPCONFIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
A.4 TRACERT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Appendix B: Cabling Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
B.1 WAN/LAN Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
B.2 Serial Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Appendix C: Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

9
CHAPTER 1: Specifications
1. Specifications
LAN Ports: Number of Ports: 4; Interface: 10BASE-T/100BASE-TX, one can be used
for uplink; Standards: IEEE 802.3
WAN Ports: (1) 10BASE-T, (1) RS-232 (V.24); DTE Speed: Up to 460 kbps
asynchronous
Protocols: Security: PAP/CHAP, MSCHAP, NAT Firewall, RADIUS and Callback for
remote access; Network: TCP/IP, IPX, DHCP, PPP, PPPoE; Routing: Static, RIP1,
VPN, IPSec, PPTP pass-through; Filtering: Protocol, port number, URL address, and
IP address
Processor: 40-MHz, 32-bit RISC
Memory: RAM: 4 MB; Flash ROM: 512 KB
Operating Temperature: 32 to 120°F (0 to 50°C)
Humidity: 25 to 85% noncondensing
Approvals: FCC Part 15, Class B
Power: 5 VDC, 1000 mA
Size: 4.9"H x 7.1"W x 1.4"D (12.5 x 18 x 3.6 cm)
Weight: 13 oz. (370 g)

10
NET ACCESS BROADBAND ROUTER W/4-PORT SWITCH USERS’ MANUAL
2. Introduction
The Net Access Broadband Router w/4-Port Switch connects a DSL or cable
modem to an Ethernet LAN to provide high-speed broadband access to the
Internet for multiple users. The Router features a built-in 4-port 10/100 switch,
one asynchronous port for backup Internet access or dial-in remote access, and
firewall services. The Router is ideal for any business looking for cost-effective
broadband access to the Internet for every use on the LAN or for the home user
looking to share their DSL cable modem.
The Router connects up to 253 internal IP addresses to the Internet with
broadband speed. It can be configured as a DHCP server to handle requests for
Internet services and route to and from the ISP. Up to 253 internal IP addresses
are connected to the Internet with only one IP account. The WAN Ethernet port
has a bandwidth of 10 Mbps, which is 179 times faster than a 56-kbps modem and
can support DSL or cable speeds of up to 2.5 Mbps.
A built-in 10/100-Mbps Switch is included with the router. The integrated 4-port
10/100 switch eliminates the need for an additional hub or switch to connect users
not on a LAN. It ensures high-speed transmission and can serve as a completely
dedicated full duplex backbone.
The Router gives you network security. It uses the NAT protocol to provide
security from hackers attempting to access the office LAN without the extra cost of
a firewall. It implements firewall and gateway security for LAN-based resources.
The Router also supports Internet access restriction by IP address, client protocols,
or a list of forbidden sites.
The Router features Dial Backup or Dial-in RAS Port. It also provides an
additional asynchronous port that, when connected to a dial-up modem or ISDN
terminal adapter, serves as a backup resource for Internet access if your DSL or
cable service goes down. It can also serve as dial-in remote access for your
telecommuters or mobile users.
Plus, it offers Virtual Server Support. In addition to providing shared Internet
access, the Router can support Web, FTP, or other Internet servers. Once
configured, the Router accepts only unsolicited IP packets addressed to the Web or
FTP server.
LAN segmentation is included with the Router. For added LAN security, you can
use the Router to segment the LAN by connecting the corporate servers to one
Router Ethernet port and the Internet servers to the other Ethernet port. This
configuration puts the corporate servers behind a firewall and the Internet servers

11
CHAPTER 2: Introduction
outside the firewall. To continue to provide Internet access, connect a modem or
ISDN terminal adapter to the Router’s asynchronous port.
2.1 Front Panel
Figure 2-1. Front panel.
Table 2-1. Front-panel indicators.
LED Group LED Description
LAN Link/Act Lights when the LAN client is correctly
connected to the 10BASE-T Ethernet LAN.
10/100 Lights when the LAN client correctly establishes
a 100-Mb s connection.
FDX/COL A steady-on light indicates a successful LAN
connection. A flickering light indicates a
otential network connection roblem.
Serial Data Blinks when the serial async ort is receiving or
transmitting data.
DCD Lights when the serial async ort is ro erly
connected to a remote site.

12
NET ACCESS BROADBAND ROUTER W/4-PORT SWITCH USERS’ MANUAL
Table 2-1 (continued). Front-panel indicators.
LED Group LED Description
WAN Link Lights when a successful connection to the
10BASE-T WAN is established.
RXD Lights when the LAN ort is receiving data.
TXD Lights when the LAN ort is transmitting data.
Power PWR Lights when ower is being su lied to the
router.
2.2 Back Panel
Figure 2-2. Back panel.
10/100 BT LAN
Uplink/Normal
1234
ASYNC
Reset
10 BT WAN
5 DC
Power

13
CHAPTER 2: Introduction
Table 2-2. Back panel connectors/buttons.
Connector/Button Description
Power 5VDC The 5-VDC ower socket is used to connect the
device to the AC ower ada ter.
10 BT WAN The WAN ort is used to connect the router to a
DSL or cable modem.
ASYNC The serial async ort connects the router to a
standard modem (o tional).
Reset The reset button is used to reset the router to
factory defaults.
10/100 BT LAN The four 10/100 orts are used to connect the
router to LAN client workstations. If the Router is
set to use the U link feature, the number 1 LAN
ort is inactive as a LAN ort.
Uplink/Normal Slide the switch to the U link osition to use the
number 1 LAN 10/100 ort to ex and your
network by connecting a network cable to
another router, switch, or hub. To connect the
number 1 ort to a LAN client workstation, slide
the switch to the Normal osition.

14
NET ACCESS BROADBAND ROUTER W/4-PORT SWITCH USERS’ MANUAL
2.3 Typical Applications
The following examples provide information about typical applications using the
Router. They describe using the Router to connect a remote site via a cable
modem, using the Router to segment a local area network, and using the Router to
connect a LAN to the Internet using one shared IP address.
2.3.1 C ONNECTING A R EMOTE S ITE VIA A C ABLE M ODEM
In the following example, the Router is used to connect a LAN to the Internet via
DSL or a cable modem.
Kernal: (outgoing TCP/IP connection sharing a single Internet IP address or using
multiple IP mapping)
• Virtual Server (allowing incoming specific TCP/IP service request redirect to
an internal server)
• Static Routing (Routing table setting to Internal Local Gateways)
• Firewall
External: Fixed External Port IP or DHCP client (Dynamic IP assigned)
Internal: Device Fixed IP, DHCP Server
Figure 2-3. Connect remote site via a cable modem.
Net Access
Broadband Router
(LRB500A)
Workstation
IP Address
192.168.0.106
Workstation
IP Address
192.168.0.105
Workstation
IP Address
192.168.0.104
Workstation
IP Address
192.168.0.103
Internet
Cable
modem

15
CHAPTER 2: Introduction
2.3.2 C ONNECTING A
L OCAL S ITE BY S EGMENTING THE LAN
In this application, the Router is used to connect LAN segments within a local site.
Kernal: Static Routing (Routing table to External or Internal Gateways)
• Firewall
External: Fixed External IP or DHCP client (Dynamic IP only)
Internal: Device Fixed IP, DHCP Server
Figure 2-4. Connect local site (segmenting the LAN).
2.3.3 C ONNECTING A L OCAL S ITE TO THE I NTERNET
In this application, the Router is used to connect up to 253 internal IP addresses to
the Internet using a single shared external IP address.
Kernal: NAT (outgoing TCP/IP connection sharing single External Port IP or
using multiple IP Mapping)
• Virtual Server (allow incoming specific TCP/IP service request redirect to
internal server)
• Firewall
External: Fixed External Port IP and mask DNS IP, Gateway IP, or DHCP client
(Dynamic IP for the device, DNS and Gateway assigned.)
Internal: Device Fixed IP, DHCP Server
Net Access
Broadband
Router
Workstation
IP Address
192.168.0.104
Workstation
IP Address
192.168.0.106
Workstation
IP Address
192.168.0.105
Workstation
IP Address
192.168.0.103
Workstation
IP Address
192.168.1.101
Workstation
IP Address
192.168.1.100
Server
IP Address
192.168.1.102
Department
Segment
(Ethernet)
Major Segment
(Ethernet)

16
NET ACCESS BROADBAND ROUTER W/4-PORT SWITCH USERS’ MANUAL
Figure 2-5. Connect local site (one external IP address = 253 internal IP
addresses).
Net Access
Broadband
Router
Internet
Cable
modem
Workstation IP
Address
192.168.0.106
Workstation IP
Address
192.168.0.105
Workstation IP
Address
192.168.0.104
Workstation IP
Address
192.168.0.103

17
CHAPTER 3: Hardware Installation
3. Hardware Installation
3.1 Safety
1. Never install telephone wiring during a lightning storm.
2. Never install telephone jacks in a wet location unless the jack is specifically
designed for wet locations.
3. This product is to be used with UL®and cUL listed computers.
4. Never touch uninsulated telephone wires or terminals unless the telephone
line has been disconnected at the network interface.
5. Avoid using a telephone (other than a cordless type) during an electrical
storm. There may be a remote risk of electrical shock from lightning.
6. Do not use the telephone to report a gas leak in the vicinity of the leak.
7. To reduce the risk of fire, use only No. 26 AWG or larger telecommunications
line cord.
3.2 What the Package Includes
The Router package contains the following items:
• Net Access Broadband Router w/4-Port Switch
• System CD containing PDF of users’ manual
• Tucows CD containing browser/shareware
• Power supply
• A Quick Start Guide
• A serial cable
If any of the items is missing or damaged, please contact Black Box at
724-746-5500.