Linksys BEFCMUH4 User manual

Linksys BEFCMUH4 Cable Gatewayr + 802.11b Wireless-Ready
Linksys BEFCMUH4
Cable Gateway with 4-Port
Switch/USB and 802.11b
Wireless-Ready
Quick Guide
COPYRIGHT & TRADEMARKS
Copyright 2002 RCA, All Rights Reserved. Microsoft,
Windows, and the Windows logo are registered trademarks
of Microsoft Corporation. All other trademarks and brand
names are the property of their respective proprietors.
FCC STATEMENT
The Linksys BEFCMUH4 has been tested and complies with
the specifications for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interface in a
residential installation. This equipment generates, uses, and
can radio frequency energy and, if not installed and used
according to the instructions, may cause harmful interference
to radio communications. However, there is no guarantee
that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or
television reception, which is found by turning the equipment
off and on, the user is encouraged to try to correct the
interference by one or more of the following measure:
• Reorient or relocate the receiving antenna
• Increase the separation between the equipment of devices
• Connect the equipment to an outlet other than the receiver
• Consult a dealer or an experienced radio/TV technician for
assistance
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Linksys BEFCMUH4 Cable Gatewayr + 802.11b Wireless-Ready
Table of Contents
CHAPTER 1: INTRODUCTION.............................................................................. 2
OVERVIEW ................................................................................................................. 2
SOFTWARE FEATURES ................................................................................................ 2
MINIMUM REQUIREMENTS......................................................................................... 4
PACKAGE CONTENTS.................................................................................................. 4
CHAPTER 2: USING THE LINKSYS BEFCMUH4 ............................................. 6
THE LINKSYS BEFCMUH4’S REAR PANEL ............................................................... 6
THE LINKSYS BEFCMUH4’S FRONT PANEL ............................................................. 7
CHAPTER 3: CONNECT THE GATEWAY ........................................................... 9
OVERVIEW ................................................................................................................. 9
CONNECTING YOUR HARDWARE TOGETHER AND BOOTING UP................................. 9
CHAPTER 4: CONFIGURE YOUR PCS ...............................................................11
OVERVIEW ............................................................................................................... 11
CONFIGURING WINDOWS 95, 98, AND MILLENNIUM PCS........................................ 11
CONFIGURING WINDOWS 2000 PCS........................................................................ 13
CONFIGURING WINDOWS XP PCS........................................................................... 14
CHAPTER 5: CONFIGURE THE GATEWAY..................................................... 15
CONFIGURING THE LINKSYS BEFCMUH4 .............................................................. 15
APPENDIX A: TROUBLESHOOTING ................................................................ 18
COMMON PROBLEMS AND SOLUTIONS ..................................................................... 18
FREQUENTLY ASKED QUESTIONS............................................................................. 29
APPENDIX B: GLOSSARY .................................................................................... 32
APPENDIX C: INSTALLING THE TCP/IP PROTOCOL ................................. 40
APPENDIX D: FINDING THE MAC ADDRESS AND IP ADDRESS FOR
YOUR ETHERNET ADAPTER ............................................................................. 43
APPENDIX E: SPECFICATIONS.......................................................................... 46
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Linksys BEFCMUH4 Cable Gatewayr + 802.11b Wireless-Ready
Chapter 1: Introduction
Overview
Thank you for purchasing the Linksys BEFCMUH4 Cable Gateway. The
Linksys BEFCMUH4 provides the ideal solution for connecting your wireless
network to a high-speed broadband Internet connection and a 10/100 Fast
Ethernet backbone. Configurable as a DHCP server for your existing network,
the Linksys BEFCMUH4 acts as the only externally recognized Internet
gateway on your local area network (LAN) and serve as an Internet NAT
firewall against unwanted outside intruders. The Linksys BEFCMUH4 can also
be configured to filter internal users’ access to the Internet.
A typical gateway relies on a hub or a switch to share its Internet connection,
but the Linksys BEFCMUH4 channels this connection through the blazing, full
duplex of its built-in 10/100 4-Port Switch. This cutting-edge combination of
wireless router and switch technology eliminates the need to buy an additional
hub or switch and extends the range of your wireless network. Now your entire
wireless network can enjoy blazing broadband Internet connections supported
by its robust switched backbone. With the dual-function speed and power of
the Linksys BEFCMUH4, your network will take off at speeds faster than you
ever imagined possible.
Software Features
DOCSIS Features
 Cable Modem (CM) is 1.0 and non 1.1 upgradeable
 Concatenation, Fragmentation, Payload Header suppression, IGMP
and BPI and BPI Plus are supported features for DOCSIS 1.1
 4/16/32/64/128/256/512/1024 QAM Downstream Receiver
 2/4/8/16/32/64/128/256 QAM Advanced TDMA Upstream Transmitter
 Both IP and LLC filters are supported
 Sixteen (16) destination address filters and 256 multicast/unicast DA
filters
 Sixteen (16) independent upstream queues for multiple QoS support
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Linksys BEFCMUH4 Cable Gatewayr + 802.11b Wireless-Ready
USB Features
 OS (Win2K, XP, WinME) supported for USB interface
Wireless Features
 Supports at least one beacon/DTIM interval of within the range
20-1000κμs
 Supports reception of fragmented packets
 Supports reception of RTS and generation of CTS
Firewall Features
 Stateful Packet Inspection against both Denial of Service and
Distributed Denial of Service attacks and will protect against the
following:
 Reassembly attacks
 SYN Attack (SYN Flood)
 ICMP Flood
 Ping of Death Attack
 Tear Drop Attack
 IP Spoofing Attack
 LAND Attack
 Jolt
 Winnuke Attack (Netbios out-of-bound)
 OverDrop
 BONK, BOINK
 Blind Spoofing
 Echo/Chargen
 Storm
 Smurf Attack
 Mime Flood
 De-Militarized Zone (DMZ) which allows a computer on the LAN to
expose all of its ports to the WAN that are not otherwise filtered
 Logged Events which all security incidents will be logged
 Keyword blocking is based on keywords in a URL and can be
specified by the user
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Linksys BEFCMUH4 Cable Gatewayr + 802.11b Wireless-Ready
NAT Requirements
The implementation of NAT must allow for specific port redirection. Listed
below are applications supported.
 FTP
 IRC
 H.323
 Quake
 Blizzard games
 Chat ALG
 Real Audio/Video
 CUSEEME
 Netmeeting
 MS Games but not with game zone
 DIABOLO II
 Activision Games
 PCAnywhere
 SSL
 NNTP
 Port Forwarding, incoming traffic that is not part of an existing
connection will be dropped unless the user specifies forwarding of the
server to a host on the LAN
Virtual Private Network (VPN) Feature
 Having the ability to enable or disable PPTP and IPSec pass through
Minimum Requirements
One RJ-45 Broadband Internet connection, with a Cable Modem





One PC with an installed 10Mbps, 100Mbps, or 10/100 Mbps Ethernet
card (optional)
TCP/IP network protocol for each PC
UTP network cable with RJ-45 connector
Microsoft Internet Explorer 4.0 or later, or Netscape Navigator 4.0 or later.
(5.0 and 4.7, respectively, are strongly recommended.)
Windows 95, 98, Millennium, NT 4.0, 2000 or XP
Package Contents
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Linksys BEFCMUH4 Cable Gatewayr + 802.11b Wireless-Ready
 {1} Cable Modem
 {1} AC Power adapter
 {1} CAT.5 Ethernet cable {RJ-45}
 {1} USB cable
 {1} User’s Manual
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Linksys BEFCMUH4 Cable Gatewayr + 802.11b Wireless-Ready
the Gateway’s data and restore the factory defaults. This should be done only
if you are experiencing heavy routing problems, and only after you have
exhausted all of the other troubleshooting options. By resetting the Gateway,
you run the risk of creating conflicts between your PCs’ actual IP Addresses
and what the Gateway thinks their IP Addresses should be. You may be forced
to reboot the entire system(s).
If your Gateway locks up, simply power it down for 5 seconds by removing the
power cable from the Gateway’s Power Port. Leaving the power off for too
long could result in the loss of network connections.
The Linksys BEFCMUH4’s Front Panel
Power Green. The power LED illuminates when the device is powered
on.
Diag Red. The Diag LED illuminates when the device goes through its
self-diagnosis mode during boot-up and restart. It will turn off
upon successful completion of the diagnosis.
The LAN indicators
USB Green. The USB LED illuminates when the USB port is properly
connected to your PC.
WLAN Green. The WLAN LED illuminates when the Wireless PC card
slide-in.
Link/Act Green. Steady on when link is up and blinking when data is
following through this LAN port.
Full/Col Green. Steady on when it operates at full duplex mode. Off at
half duplex mode. Blinking when collision is occurred on this
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Linksys BEFCMUH4 Cable Gatewayr + 802.11b Wireless-Ready
port.
10/100 Green. Steady on when a successful 100Mbps connection is
made through the corresponding port.
The WAN indicators
Cable Green. Steady on when cable is registered and ready to transfer
data. Blinking when no downstream RF carrier present.
Receive Green. Blinking when user data going through the cable modem
to PC present.
Send Green. Blinking when user data going through the cable modem
from PC present.
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Linksys BEFCMUH4 Cable Gatewayr + 802.11b Wireless-Ready
Chapter 3: Connect the Gateway
Overview
Unlike a simple hub or switch, the Gateway’s setup consists of more than
simply plugging hardware together. You will have to configure your networked
PCs to accept the IP addresses that the Gateway assigns them (if applicable),
and you will also have to configure the Gateway with setting(s) provided by
your Internet Service Provider (ISP).
The installation technician from your ISP should have left the setup
information with you after installing your broadband connection. If not, you can
call your ISP to request the data.
Once you have the setup information you need for your specific type of
Internet connection, you can begin installation and setup of the Gateway.
Connecting Your Hardware Together and Booting Up
1. Before you begin, make sure that all of you hardware is powered off,
including the Gateway, PCs, hubs, and switches.
2. Connect one end of an Ethernet cable to one of the LAN ports (labeled 1, 2,
3, or 4) on the back of the Gateway and the other end to a standard port on
a network device, e.g., a PC, print server, hub, or switch. Repeat the above
step to connect more PCs or network devices to the Gateway.
3. Connect the cable from your ISP to the Cable port on the Gateway’s back
panel.
4. Connect the power-supply cable to the Power port on the rear of the
Gateway, then plug the supplied AC power cable into a power outlet and
power on the Linksys BEFCMUH4.
• The Power LED on the front panel will light up green as soon as the
power adapter is connected properly.
• The Diag LED will light up red for a few seconds when the Gateway
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