54

Appendix A: Troubleshooting

Frequently Asked Questions

Wireless-G ADSL Gateway

Does the 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 80 seconds in the firewall setting. The Internet user can then send a file

to a user behind the Gateway.

I 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.

(Port 8080 usually works well but is used for remote admin. You may have to disable this.) 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 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.

How do I get Half-Life: Team Fortress to work with the 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 website at

www.linksys.com for more information.

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

Reset the Gateway by holding down the reset button until the Power LED fully turns on and off. Reset your DSL

modem by powering the unit off and then on.

Obtain and flash the latest firmware release that is readily available

on the Linksys website, www.linksys.com.

How will I be notified of new Gateway firmware upgrades?

All Linksys firmware upgrades are posted on the Linksys website at www.linksys.com, where they can be

downloaded for free. To upgrade the Gateway’s firmware, use the Administration tab of the Gateway’s web-

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Appendix A: Troubleshooting

Frequently Asked Questions

Wireless-G ADSL Gateway

based utility. If the Gateway’s Internet connection is working well, there is no need to download a newer

firmware version, unless that version contains new features that you would like to use.

Will the Gateway function in a Macintosh environment?

Yes, but the Gateway’s setup pages are accessible only through Internet Explorer 4.0 or Netscape Navigator 4.0

or higher for Macintosh.

I am not able to get the web configuration screen for the Gateway.

What can I do?

You may have to remove the proxy settings on your Internet browser, e.g., Netscape Navigator or Internet

Explorer. Check with your browser documentation, and make sure that your browser is set to connect directly

and that any dial-up is disabled. For Internet Explorer, click Tools, Internet Options, and then the Connection tab.

Make sure that Internet Explorer is set to Never dial a connection. For Netscape Navigator, click Edit,

Preferences, Advanced, and Proxy. Make sure that Netscape Navigator is set to Direct connection to the Internet.

What is DMZ Hosting?

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 Hosting. To get the LAN IP address, see “Appendix D: Finding the MAC Address and IP Address

for Your Ethernet Adapter.”

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

No.

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

The Gateway allows PPTP packets to pass through.

Is the Gateway cross-platform compatible?

Any platform that supports Ethernet and TCP/IP is compatible with the Gateway.

How many ports can be simultaneously forwarded?

Theoretically, the Gateway can establish 520 sessions at the same time, but you can only forward 10 ranges of

ports.

What are the advanced features of the Gateway?

The Gateway’s advanced features include Advanced Wireless settings, Filters, Port Forwarding, Routing, and

DDNS.

What is the maximum number of VPN sessions allowed by the Gateway?

The maximum number depends on many factors. At least one IPSec session will work through the Gateway;

however, simultaneous IPSec sessions may be possible, depending on the specifics of your VPNs.

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Appendix A: Troubleshooting

Frequently Asked Questions

Wireless-G ADSL Gateway

How can I check whether I have static or DHCP IP Addresses?

Consult your ISP to obtain this information.

How do I get mIRC to work with the Gateway?

Under the Port Forwarding tab, set port forwarding to 113 for the computer on which you are using mIRC.

Can the Gateway act as my DHCP server?

Yes. The Gateway has DHCP server software built-in.

Can I run an application from a remote computer over the wireless network?

This will depend on whether or not the application is designed to be used over a network. Consult the

application’s documentation to determine if it supports operation over a network.

What is the IEEE 802.11g standard?

It is one of the IEEE standards for wireless networks. The 802.11g standard allows wireless networking hardware

from different manufacturers to communicate, provided that the hardware complies with the 802.11g standard.

The 802.11g standard states a maximum data transfer rate of 54Mbps and an operating frequency of 2.4GHz.

What IEEE 802.11b and 802.11g features are supported?

The product supports the following IEEE 802.11b and IEEE 802.11g functions:

•

CSMA/CA plus Acknowledge protocol

•

Multi-Channel Roaming

•

Automatic Rate Selection

•

RTS/CTS feature

•

Fragmentation

•

Power Management

What is ad-hoc mode?

When a wireless network is set to ad-hoc mode, the wireless-equipped computers are configured to

communicate directly with each other, peer-to-peer without the use of an access point.

What is infrastructure mode?

When a wireless network is set to infrastructure mode, the wireless network is configured to communicate with

a network through a wireless access point.

What is roaming?

Roaming is the ability of a portable computer user to communicate continuously while moving freely throughout

an area greater than that covered by a single access point. Before using the roaming function, the computer must

make sure that it is the same channel number with the access point of dedicated coverage area.

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Appendix A: Troubleshooting

Frequently Asked Questions

Wireless-G ADSL Gateway

To achieve true seamless connectivity, the wireless LAN must incorporate a number of different functions. Each

node and access point, for example, must always acknowledge receipt of each message. Each node must

maintain contact with the wireless network even when not actually transmitting data. Achieving these functions

simultaneously requires a dynamic RF networking technology that links access points and nodes. In such a

system, the user’s end node undertakes a search for the best possible access to the system. First, it evaluates

such factors as signal strength and quality, as well as the message load currently being carried by each access

point and the distance of each access point to the wired backbone. Based on that information, the node next

selects the right access point and registers its address. Communications between end node and host computer

can then be transmitted up and down the backbone.

As the user moves on, the end node’s RF transmitter regularly checks the system to determine whether it is in

touch with the original access point or whether it should seek a new one. When a node no longer receives

acknowledgment from its original access point, it undertakes a new search. Upon finding a new access point, it

then re-registers, and the communication process continues.

What is Ihe ISM band?

The FCC and their counterparts outside of the U.S. have set aside bandwidth for unlicensed use in the ISM

(Industrial, Scientific and Medical) band. Spectrum in the vicinity of 2.4 GHz, in particular, is being made available

worldwide. This presents a truly revolutionary opportunity to place convenient high-speed wireless capabilities in

the hands of users around the globe.

What is Spread Spectrum?

Spread Spectrum technology is a wideband radio frequency technique developed by the military for use in

reliable, secure, mission-critical communications systems. It is designed to trade off bandwidth efficiency for

reliability, integrity, and security. In other words, more bandwidth is consumed than in the case of narrowband

transmission, but the trade-off produces a signal that is, in effect, louder and thus easier to detect, provided that

the receiver knows the parameters of the spread-spectrum signal being broadcast. If a receiver is not tuned to

the right frequency, a spread-spectrum signal looks like background noise. There are two main alternatives,

Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).

What is DSSS? What is FHSS? And what are their differences?

Frequency-Hopping Spread-Spectrum (FHSS) uses a narrowband carrier that changes frequency in a pattern that

is known to both transmitter and receiver. Properly synchronized, the net effect is to maintain a single logical

channel. To an unintended receiver, FHSS appears to be short-duration impulse noise. Direct-Sequence Spread-

Spectrum (DSSS) generates a redundant bit pattern for each bit to be transmitted. This bit pattern is called a chip

(or chipping code). The longer the chip, the greater the probability that the original data can be recovered. Even if

one or more bits in the chip are damaged during transmission, statistical techniques embedded in the radio can

recover the original data without the need for retransmission. To an unintended receiver, DSSS appears as low

power wideband noise and is rejected (ignored) by most narrowband receivers.

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Appendix A: Troubleshooting

Frequently Asked Questions

Wireless-G ADSL Gateway

Will the information be intercepted while it is being transmitted through the air?

WLAN features two-fold protection in security. On the hardware side, as with Direct Sequence Spread Spectrum

technology, it has the inherent security feature of scrambling. On the software side, WLAN offers the encryption

function (WEP) to enhance security and access control.

What is WEP?

WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 64-bit or 128-bit shared key algorithm, as

described in the IEEE 802.11 standard.

What is a MAC Address?

The Media Access Control (MAC) address is a unique number assigned by the manufacturer to any Ethernet

networking device, such as a network adapter, that allows the network to identify it at the hardware level. For all

practical purposes, this number is usually permanent. Unlike IP addresses, which can change every time a

computer logs onto the network, the MAC address of a device stays the same, making it a valuable identifier for

the network.

How do I reset the Gateway?

Press the Reset button on the back panel for about ten seconds. This will reset the Gateway to its default

settings.

How do I resolve issues with signal loss?

There is no way to know the exact range of your wireless network without testing. Every obstacle placed

between the Gateway and a wireless computer will create signal loss.

Lead glass, metal, concrete floors, water

and walls will inhibit the signal and reduce range.

Start with the Gateway and your wireless computer in the

same room and move it away in small increments to determine the maximum range in your environment.

You may also try using different channels, as this may eliminate interference affecting only one channel.

I have excellent signal strength, but I cannot see my network.

WEP is probably enabled on the Gateway, but not on your wireless adapter (or vice versa).

Verify that the same

WEP keys and levels (64 or 128) are being used on all nodes of your wireless network.

How many channels/frequencies are available with the Gateway?

There are eleven available channels, ranging from 1 to 11 (in North America).

If your questions are not addressed here, refer to the Linksys website, www.linksys.com.