44

Chapter 5: Configuring the Gateway

The Status Tab

Wireless-G ADSL Gateway

DSL Connection

The DSL Connection information that is displayed is the Status, Downstream Rate, Upstream Rate, Encapsulation,

VPI, VcI, and Multiplexing. (See Figure 5-40.)

Click the

Refresh

button if you want to Refresh your screen.

Figure 5-39: DSL Connection

45

Appendix A: Troubleshooting

Common Problems and Solutions

Wireless-G ADSL Gateway

Appendix A: Troubleshooting

This appendix consists of two parts: “Common Problems and Solutions” and “Frequently Asked Questions.”

Provided are possible solutions to problems that may occur during the installation and operation of the Gateway.

Read the descriptions below to help you solve your problems. If you can’t find an answer here, check the Linksys

website at www.linksys.com.

Common Problems and Solutions

1.

I need to set a static IP address on a computer.

You can assign a static IP address to a computer by performing the following steps:

•

For Windows 98 and Me:

1.

Click

Start

,

Settings

, and

Control Panel

. Double-click

Network

.

2.

In The following network components are installed box, select the TCP/IP-> associated with your

Ethernet adapter. If you only have one Ethernet adapter installed, you will only see one TCP/IP line

with no association to an Ethernet adapter. Highlight it and click the Properties button.

3.

In the TCP/IP properties window, select the IP address tab, and select Specify an IP address. Enter a

unique IP address that is not used by any other computer on the network connected to the Gateway.

Make sure that each IP address is unique for each computer or network device.

4.

Click the

Gateway

tab, and in the New Gateway prompt, enter 192.168.1.1, which is the default IP

address of the Gateway. Click the Add button to accept the entry.

5.

Click the

DNS

tab, and make sure the DNS Enabled option is selected. Enter the Host and Domain

names (e.g., John for Host and home for Domain). Enter the DNS entry provided by your ISP. If your

ISP has not provided the DNS IP address, contact your ISP to get that information or go to its website

for the information.

6.

Click the

OK

button in the TCP/IP properties window, and click Close or

the OK button for the Network

window.

7.

Restart the computer when asked.

•

For Windows 2000:

1.

Click

Start

,

Settings

, and

Control Panel

. Double-click

Network and Dial-Up Connections

.

2.

Right-click the Local Area Connection that is associated with the Ethernet adapter you are using, and

select the Properties option.

3.

In the Components checked are used by this connection box, highlight Internet Protocol (TCP/IP), and

click the

Properties

button. Select

Use the following IP address

option.

4.

Enter a unique IP address that is not used by any other computer on the network connected to the

Gateway.

5.

Enter the Subnet Mask, 255.255.255.0.

6.

Enter the Default Gateway, 192.168.1.1 (Gateway’s default IP address).

46

Appendix A: Troubleshooting

Common Problems and Solutions

Wireless-G ADSL Gateway

7.

Toward the bottom of the window, select Use the following DNS server addresses, and enter the

Preferred DNS server and Alternative DNS server (provided by your ISP). Contact your ISP or go on its

website to find the information.

8.

Click the

OK

button in the Internet Protocol (TCP/IP) Properties window, and click the

OK

button in the

Local Area Connection Properties window.

9.

Restart the computer if asked.

•

For Windows XP:

The following instructions assume you are running Windows XP with the default interface. If you are using

the Classic interface (where the icons and menus look like previous Windows versions), please follow the

instructions for Windows 2000.

1.

Click

Start

and

Control Panel

.

2.

Click the

Network and Internet Connections

icon and then the

Network Connections

icon.

3.

Right-click the

Local Area Connection

that is associated with the Ethernet adapter you are using,

and select the Properties option.

4.

In the

This connection uses the following items

box, highlight

Internet Protocol (TCP/IP)

. Click

the

Properties

button.

5.

Enter a unique IP address that is not used by any other computer on the network connected to the

Gateway.

6.

Enter the Subnet Mask, 255.255.255.0.

7.

Enter the Default Gateway, 192.168.1.1 (Gateway’s default IP address).

8.

Toward the bottom of the window, select Use the following DNS server addresses, and enter the

Preferred DNS server and Alternative DNS server (provided by your ISP). Contact your ISP or go on its

website to find the information.

9.

Click the

OK

button in the Internet Protocol (TCP/IP) Properties window. Click the

OK

button in the

Local Area Connection Properties window.

2.

I want to test my Internet connection.

A.

Check your TCP/IP settings.

For Windows 98, Me, 2000, and XP:

•

Refer to “Chapter 4: Configure the computers” for details. Make sure Obtain IP address automatically is

selected in the settings.

For Windows NT 4.0:

•

Click

Start

,

Setting

s, and

Control Panel

. Double-click the

Network

icon.

•

Click the Protocol tab, and double-click on TCP/IP Protocol.

•

When the window appears, make sure you have selected the correct Adapter for your Ethernet adapter

and set it for

Obtain an IP address

from a DHCP server.

•

Click the

OK

button in the TCP/IP Protocol Properties window, and click the

Close

button in the Network

window.

•

Restart the computer if asked.

47

Appendix A: Troubleshooting

Common Problems and Solutions

Wireless-G ADSL Gateway

B.

Open a command prompt.

For Windows 98 and Me:

•

Click

Start

and

Run

. In the Open field, type in command. Press the

Enter

key or click the

OK

button.

For Windows NT, 2000, and XP:

•

Click

Star

t and

Run

. In the Open field, type cmd. Press the

Enter

key or click the

OK

button. In the

command prompt, type ping 192.168.1.1 and press the Enter key.

•

If you get a reply, the computer is communicating with the Gateway.

•

If you do NOT get a reply, please check the cable, and make sure Obtain an IP address automatically is

selected in the TCP/IP settings for your Ethernet adapter.

C.

In the command prompt, type ping followed by your Internet or WAN IP address and press the

Enter

key.

The Internet or WAN IP Address can be found on the Status screen of the Gateway’s web-based utility. For

example, if your Internet or WAN IP address is 1.2.3.4, you would enter ping 1.2.3.4 and press the Enter

key.

•

If you get a reply, the computer is connected to the Gateway.

•

If you do NOT get a reply, try the ping command from a different computer to verify that your original

computer is not the cause of the problem.

D.

In the command prompt, type ping www.yahoo.com and press the

Enter

key.

•

If you get a reply, the computer is connected to the Internet. If you cannot open a webpage, try the ping

command from a different computer to verify that your original computer is not the cause of the problem.

•

If you do NOT get a reply, there may be a problem with the connection.

Try the ping command from a

different computer to verify that your original computer is not the cause of the problem.

3.

I am not getting an IP address on the Internet with my Internet connection.

•

Refer to “Problem #2, I want to test my Internet connection” to verify that you have connectivity.

1.

Make sure you are using the right Internet connection settings. Contact your ISP to see if your Internet

connection type is RFC 1483 Bridged, RFC 1483 Routed, RFC 2516 PPPoE, or RFC 2364 PPPoA.

Please

refer to the Setup section of “Chapter 5: Configuring the Gateway” for details on Internet connection

settings.

2.

Make sure you have the right cable. Check to see if the Gateway column has a solidly lit ADSL LED.

3.

Make sure the cable connecting from your Gateway’s ADSL port is connected to the wall jack of the

ADSL service line. Verify that the Status page of the Gateway’s web-based utility shows a valid IP

address from your ISP.

4.

Turn off the computer and Gateway. Wait 30 seconds, and then turn on the Gateway, and computer.

Check the Status tab of the Gateway’s web-based utility to see if you get an IP address.

4.

I am not able to access the Setup page of the Gateway’s web-based utility.

•

Refer to “Problem #2, I want to test my Internet connection” to verify that your computer is properly

connected to the Gateway.

1.

Refer to “Appendix D: Finding the MAC Address and IP address for Your Ethernet Adapter” to verify

that your computer has an IP Address, Subnet Mask, Gateway, and DNS.

2.

Set a static IP address on your system; refer to “Problem #1: I need to set a static IP address.”

48

Appendix A: Troubleshooting

Common Problems and Solutions

Wireless-G ADSL Gateway

3.

Refer to “Problem #10: I need to remove the proxy settings or the dial-up pop-up window (for PPPoE

users).”

5.

I can’t get my Virtual Private Network (VPN) working through the Gateway.

Access the Gateway’s web interface by going to http://192.168.1.1 or the IP address of the Gateway, and go

to the Security tab.

Make sure you have IPsec passthrough and/or PPTP pass-through enabled.

•

VPNs that use IPSec with the ESP (Encapsulation Security Payload known as protocol 50) authentication

will work fine. At least one IPSec session will work through the Gateway; however, simultaneous IPSec

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

•

VPNs that use IPSec and AH (Authentication Header known as protocol 51) are incompatible with the

Gateway.

AH has limitations due to occasional incompatibility with the NAT standard.

•

Change the IP address for the Gateway to another subnet to avoid a conflict between the VPN IP address

and your local IP address. For example, if your VPN server assigns an IP address 192.168.1.X (X is a

number from 1 to 254) and your local LAN IP address is 192.168.1.X (X is the same number used in the

VPN IP address), the Gateway will have difficulties routing information to the right location.

If you change

the Gateway’s IP address to 192.168.2.1, that should solve the problem. Change the Gateway’s IP address

through the Setup tab of the web interface.

•

If you assigned a static IP address to any computer or network device on the network, you need to change

its IP address accordingly to 192.168.2.Y (Y being any number from 1 to 254). Note that each IP address

must be unique within the network.

•

Your VPN may require port 500/UDP packets to be passed to the computer that is connecting to the IPSec

server. Refer to “Problem #7, I need to set up online game hosting or use other Internet applications” for

details.

•

Check the Linksys website for more information at www.linksys.com.

6.

I need to set up a server behind my Gateway and make it available to the public.

To use a server like a web, ftp, or mail server, you need to know the respective port numbers they are using.

For example, port 80 (HTTP) is used for web; port 21 (FTP) is used for FTP, and port 25 (SMTP outgoing) and

port 110 (POP3 incoming) are used for the mail server.

You can get more information by viewing the

documentation provided with the server you installed.

•

Follow these steps to set up port forwarding through the Gateway’s web-based utility. We will be setting

up web, ftp, and mail servers.

1.

Access the Gateway’s web-based utility by going to http://192.168.1.1 or the IP address of the

Gateway. Go to the Applications and Gaming => Port Range Forwarding tab.

2.

Enter any name you want to use for the Customized Application.

3.

Enter the External Port range of the service you are using. For example, if you have a web server, you

would enter the range 80 to 80.

4.

Check the protocol you will be using, TCP and/or UDP.

5.

Enter the IP address of the computer or network device that you want the port server to go to. For

example, if the web server’s Ethernet adapter IP address is 192.168.1.100, you would enter 100 in the