Linksys BEFCMUH4 Router Manual PDF (Setup & Configuration Guide)

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Cable Gateway

Instant Broadband

Series

DTIM Interval

This value indicates the interval of the Delivery

Traffic Indication Message (DTIM). A DTIM

field is a countdown field informing clients of the

next window for listening to broadcast and multi-

cast messages. When the Cable Gateway has

buffered broadcast or multicast messages for

associated clients, it sends the next DTIM with a

DTIM Interval value.

Clients for the Cable

Gateway hear the beacons and awaken to receive

the broadcast and multicast messages.

Fragmentation Threshold

This value indicates how much of the Cable

Gateway’s resources are devoted to recovering

packet errors. The value should remain at its

default setting of 2,346. If you have decreased this

value and experience high packet error rates, you

can increase it again, but it will likely decrease

overall network performance. Only minor modifi-

cations of this value are recommended.

RTS Threshold

This value should remain at its default setting of

2,347. Should you encounter inconsistent data

flow, only minor modifications are recommended.

click the

Apply

button to save any changes.

The Advanced Tab

From the Advanced tab, shown in Figure 5-9, you can configure the Cable

Gateway’s more advanced wireless features.

Basic Data Rates

The basic transfer rates should be set depending on the

speed of your wireless network. You must select

1, 2 Mbps

if you have older 802.11 compliant equipment on your net-

work, such as wireless adapters that support only 1 or 2

Mbps. Faster wireless adapters can support the second

choice from the drop-down menu:

1, 2, 5.5, 11 Mbps

Control TX Rates

The control transfer rates should be set depending on the

speed of your wireless network. You must select

1, 2 Mbps

if you have older 802.11 compliant equipment on your net-

work, such as wireless adapters that support only 1 or 2

Mbps. Faster wireless adapters can support the second

choice from the drop-down menu:

1, 2, 5.5, 11 Mbps

Beacon Interval

This value indicates the frequency interval of the beacon. A

beacon is a packet broadcast by the Cable Gateway to keep

the network synchronized. A beacon includes the wireless

LAN service area, the IP address, the Broadcast destination

addresses, a time stamp, Delivery Traffic Indicator Maps,

and the Traffic Indicator Message (TIM).

Figure 5-8

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Page 27 / 43

I can’t access the Internet from the Cable Gateway.

• Check if both ends of the network cable and power adapter are properly

connected. Check if the status LEDs on the front panel are functioning

properly.

•

If using Windows 95, 98 or Me, check the TCP/IP setup on the client side.

Run

winipcfg

by clicking on the

Start

button, selecting

Run

, and typing

winipcfg

in the Run field. Press

Enter

The PC should have an IP address

of 192.168.0.xxx (“xxx” is from 2 to 254.). The Subnet Mask is

255.255.255.0; the default gateway IP should be the Cable Gateway’s IP

Address, and check that the DNS is correct.

• Check the same setup values in the Cable Gateway’s Summary page.

When I enter a URL or IP address, I get a time out error.

• Check to see if your other PCs work. If they do, verify that your PC’s IP

settings are correct (IP address, Subnet Mask, Default Gateway, and

DNS)

•

If the PCs are configured correctly, but still not working, check the Cable

Gateway. Make sure that it is connected and ON. Connect to it and check

its settings. (If you cannot connect to it, check the LAN and power con-

nections.)

•

If the Cable Gateway is configured correctly, check your Internet connec-

tion to see that it is working correctly.

•

Manually configure the TCP/IP with a DNS address provided by your ISP.

What is the maximum number of IP addresses that the Cable Gateway will sup-

port?

The Cable Gateway will support up to 253 IP addresses.

Does the Cable Gateway support IPSec Pass-Through?

Yes, it is a feature built

into the Cable Gateway.

Does the Cable Gateway support IPX or AppleTalk?

No. TCP/IP is the only proto-

col standard for the Internet and has become the global standard for commu-

nications. IPX, a NetWare communications protocol used only to route mes-

sages from one node to another, and AppleTalk, a communications protocol

used on Apple and Macintosh networks, can be used for LAN to LAN con-

nections, but those protocols cannot connect from WAN to LAN.

Cable Gateway

Instant Broadband

Series

Frequently Asked Questions

Appendix A: Troubleshooting

This section provides possible solutions to problems regarding the Cable

Gateway’s installation and operation. If your situation is described here, the

problem should be solved by applying the corresponding solution.

If you can’t

find an answer here, check the Linksys website at

www.linksys.com

The Cable Gateway is not working.

• Verify that the Power cord and other network cables are plugged in.

•

Check the LAN and Cable Modem - Cable LEDs on the Cable Gateway’s

front and verify that they are lit appropriately.

• Check the settings on your PC.

• Check the Cable Gateway’s settings.

I can’t connect to the Cable Gateway.

•

Verify that the Cable Gateway is properly installed; LAN connections are

OK, and it is powered ON.

• Make sure that your PC and the Cable Gateway are on the same network

segment. If you are not sure, initiate the DHCP function, and let the PC

get the IP address automatically.

•

Make sure that your PC is using an IP address within the default range of

192.168.0.2 to 192.168.0.254 and thus compatible with the Cable

Gateway default IP Address of 192.168.0.1

•

Also, the Subnet Mask should be set to 255.255.255.0 to match the Cable

Gateway. For the Cable Gateway, you can check these settings by using

Control Panel-Network to check the Properties for the TCP/IP protocol.

The Diag LED stays lit when it shouldn’t.

•

The Diag LED lights up when the device is first powered up. The system

will boot up itself and check for proper operation. After finishing the

checking procedure, the LED turns off to show the system is working

fine. If the LED remains lit after this time, the device is not working prop-

erly. Contact your cable provider if this problem persists.

The Cable Link LED will not go solid.

• Verify that the coaxial cable is firmly plugged into the Cable Gateway’s

cable port, with the other end plugged directly into the Cable wall jack.

• Verify that your Cable account is active.

Common Problems and Solutions

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Cable Gateway

Instant Broadband

Series

How do I get

Half-Life:Team Fortress

to work with the Cable Gateway?

The default

client port for Half-Life is 27005.

The computers on your LAN need to have

“+clientport 2700x” added to the HL shortcut command line; the x would be

6, 7, 8, and on up. This lets multiple computers connect to the same server.

One problem:

Version 1.0.1.6 won’t let multiple computers with the same CD

key connect at the same time, even if on the same LAN (not a problem with

1.0.1.3).

As far as hosting games, the HL server does not need to be in the

DMZ. Just forward port 27015 to the local IP address of the server computer.

The web page hangs; downloads are corrupt, or nothing but junk characters are

being displayed on the screen. What do I need to do?

Force your Ethernet

adapter to 10Mbps or half duplex mode, and turn off the “Auto-negotiate”

feature of your Ethernet adapter as a temporary measure. (Please look at the

Network Control Panel in your Ethernet adapter’s Advanced Properties tab.)

Make sure that your proxy setting is disabled in the browser. Check our web-

site at

www.linksys.com

for more information.

If all else fails in the installation, what can I do?

Reset the Cable Gateway by

holding down the reset button until the Diag LED fully turns on and off.

Will the Cable Gateway function in a Macintosh environment?

Yes, but the Cable

Gateway’s setup pages are accessible only through Internet Explorer v4.0 or

Netscape Navigator v4.0 or higher for Macintosh. NOTE: Linksys does not

provide technical support for Macintosh computers.

With which type of firewall is the Cable Gateway equipped?

The Cable Gateway

uses NAT and TCP/IP port inspections. It also has SPI (Stateful Packet

Inspection).

I am not able to access the Cable Gateway’s web configuration screen.

What can

I do?

You may have to remove the proxy settings on your Internet browser,

e.g., Netscape Navigator or Internet Explorer.

Or remove the dial-up settings

on your browser.

Check with your browser documentation.

What is DMZ?

Demilitarized Zone (DMZ) allows one IP address (computer) to

be exposed to the Internet.

Some applications require multiple TCP/IP ports

to be open.

It is recommended that you set your computer with a static IP if

you want to use DMZ.

If DMZ is used, does the exposed user share the public IP with the Cable Gateway?

No.

What is

Network Address Translation

and what is it used for?

Network Address

Translation (NAT) translates multiple IP addresses on the private LAN to one

public address that is sent out to the Internet. This adds a level of security

since the address of a PC connected to the private LAN is never transmitted

on the Internet. Furthermore, NAT allows the Cable Gateway to be used with

low cost Internet accounts, when only one TCP/IP address is provided by the

ISP. The user may have many private addresses behind this single address pro-

vided by the ISP.

Does the Cable Gateway support any operating system other than Windows 95, 98,

Me, NT, 2000, or XP?

Yes, but Linksys does not, at this time, provide technical

support for setup, configuration or troubleshooting of any non-Windows

operating systems. USB features are only supported by Windows 98, Me,

2000, and XP.

Does the Cable Gateway support ICQ send file?

Yes, with the following fix: click

ICQ menu -> preference -> connections tab->

, and check

I am behind a

firewall or proxy

. Then set the firewall time-out to

seconds in the firewall

setting. The Internet user can then send a file to a user behind the Cable

Gateway.

How do I get KaZaA to work with the Cable Gateway?

KaZaA

is fully compatible

with the Cable Gateway, but you must make sure that, during installation, you

select “no idea” when asked about your firewall selection.

Set your proxy set-

tings to “No Proxy Server” in your

File>Preferences.

set up an Unreal Tournament Server, but others on the LAN cannot join. What do

I need to do?

If you have a dedicated Unreal Tournament server running, you

need to create a static IP for each of the LAN computers and forward ports

7777, 7778, 7779, 7780, 7781, and 27900 to the IP address of the server. You

can also use a port forwarding range of 7777 ~ 27900. If you want to use the

UT Server Admin, forward another port (8080 usually works well but is used

for remote admin. You may have to disable this.), and then in the

[UWeb.WebServer] section of the server.ini file, set the ListenPort to 8080 (to

match the mapped port above) and ServerName to the IP assigned to the

Cable Gateway from your ISP.

Can multiple gamers on the LAN get on one game server and play simultaneously

with just one public IP address?

It depends on which network game or what

kind of game server you are using.

For example, Unreal Tournament supports

multi-login with one public IP.

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Cable Gateway

Instant Broadband

Series

Appendix B:Configuring Wireless

Security in Windows XP

An acronym for Wired Equivalent Privacy, WEP is an encryption scheme used

to protect your wireless data communications.

WEP uses a combination of 64-

bit or 128-bit keys to provide access control to your network and encryption

security for every data transmission.

To decode a data transmission, each point

in a network must use an identical 64-bit or 128-bit key.

Higher encryption lev-

els mean higher levels of security, but due to the complexity of the encryption,

they may mean decreased network performance.

You may also have heard the term “40-bit” used in conjunction with WEP

Encryption.

This is simply another term for 64-bit WEP encryption.

This level

of WEP encryption has been called 40-bit because it uses a 40-bit secret key

along with a 24-bit Initialization Vector (40 + 24 = 64).

Wireless vendors may

use either name.

Linksys uses the term “64-bit” when referring to this level of

encryption.

If possible, make sure your wireless network is functioning before attempting

to configure WEP.

A 128-bit WEP encrypted wireless network will NOT communicate with a 64-

bit WEP encrypted wireless network.

Therefore, make sure that all of your

wireless devices are using the same encryption level.

All wireless devices com-

plying with the 802.11b standard will support 64-bit WEP.

Configure WEP in

the Wireless Setup section

of “Chapter 5: Using the

Gateway’s Web-based Utility.” Go to

Features Setup

tab.

Click on

Wireless

then

Setup

. Use the WEP Key in the Key 1 field to configure WEP in Windows

XP.

Note:

WEP Encryption is an additional data security measure and

not essential for Gateway operation.

Does the Cable Gateway pass PPTP packets or actively route PPTP sessions?

The

Cable Gateway allows PPTP packets to pass through.

Is the Cable Gateway cross-platform compatible?

Any platform that supports

Ethernet and TCP/IP is compatible with the Cable Gateway.

How many ports can be simultaneously forwarded?

Theoretically, the Cable

Gateway can establish 520 sessions at the same time, but you can only for-

ward 10 ranges of ports.

Does the Cable Gateway replace a modem?

Is there a cable modem in the Cable

Gateway?

Yes. The Cable Gateway has an integrated cable modem, so this

product will replace your current cable modem.

What are the Cable Gateway’s advanced features?

The Cable Gateway’s

advanced features include Filters, Forwarding, and DMZ host.

How do I get mIRC to work with the Cable Gateway?

Set port forwarding to 113

for the computer on which you are using mIRC.

If you are experiencing dif-

ficulty after setting the port forwarding, try changing the Direct Client-to-

Client (DCC) settings to a range from 1024 to 1030 on the DCC option and

Forwarding page of the Web-based Setup Utility.

If your questions are not addressed here, refer to the contact information

on the last page of this manual, or online at

support.linksys.com

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In the “Control Panel” window, click the

Network and Internet

Connections

icon.

Click on the

Network Connections

icon.

The “Network Connections” window will appear.

Under LAN or High-

Speed Internet you will see all Network cards that are installed and operat-

ing in your computer. Double-click the

Wireless Network Connection

icon associated with your wireless adapter.

If the “Wireless Network Connection Status” window appears, continue to

the next step.

Cable Gateway

Instant Broadband

Series

The following steps will help you enable WEP and enter the encryption key

manually for your wireless PC cards, in order to enable your Windows XP sys-

tem to communicate with the Gateway wirelessly.

These steps assume that you are running Windows XP in the default mode.

Be sure you have the WEP Key generated in the Gateway, shown in the Key 1

field.

Click the

Start

button and go to the

Control Panel

Figure B-2

Figure B-3

Figure B-1

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