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Appendix A: Troubleshooting

Common Problems and Solutions

3.

In the

Components checked are used by this connection

box, highlight

Internet Protocol (TCP/IP)

,

and click the

Properties

button. Make sure that

Obtain an IP address automatically

and

Obtain

DNS server address automatically

are selected.

4.

Click the

OK

button in the

Internet Protocol (TCP/IP) Properties

window, and click the

OK

button in

the

Local Area Connection Properties

window.

5.

Restart the computer if asked.

6.

Click the

OK

button in the

Internet Protocol (TCP/IP) Properties

window, and click the

OK

button in

the

Local Area Connection Properties

window.

7.

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)

, and click

the

Properties

button.

Make sure that

Obtain an IP address automatically

and

Obtain DNS

server address automatically

are selected.

B.

Open a command prompt.

•

For Windows 98 and Millennium, click

Start

and

Run

. In the

Open

field, type

command

. Press the

Enter

key or click the

OK

button.

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Appendix A: Troubleshooting

Common Problems and Solutions

•

For Windows 2000 and XP, click

Start

and

Run

. In the

Open

field, type

cmd

. Press the

Enter

key or

click the

OK

button.

C.

In the command prompt, type

ping 192.168.15.1

and press the

Enter

key.

•

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

•

If you do NOT get a reply, check the cable, and make sure

Obtain an IP address automatically

is

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

D.

In the command prompt, type

ping

followed by your Internet IP address and press the

Enter

key.

The

Internet IP Address can be found in the web interface of the Router. For example, if your Internet 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 Router.

•

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.

E.

In the command prompt, type

ping www.linksys.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.

5.

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

A.

Refer to “Problem #4, I want to test my Internet connection” to verify that you have connectivity.

B.

If you need to register the MAC address of your Ethernet adapter with your ISP, please see “Appendix B:

Finding the MAC Address and IP Address for Your Ethernet Adapter.” If you need to clone the MAC

address of your Ethernet adapter onto the Router, see the MAC Address Clone section of “Chapter 5:

Configuring the Router” for details.

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Appendix A: Troubleshooting

Common Problems and Solutions

C.

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

type is DHCP, Static IP Address, or PPPoE (commonly used by DSL consumers).

Please refer to the Basic

Setup section of “Chapter 5: Configuring the Router” for details on Internet Connection Type settings.

D.

Make sure you use the right cable. Check to see if the Internet LED is solidly lit.

E.

Make sure the cable connecting from your cable or DSL modem is connected to the Router’s Internet

port. Verify that the Status page of the Router’s Web-based Utility shows a valid IP address from your

ISP.

F.

Turn off the computer, Router, and cable/DSL modem. Wait 30 seconds, and then turn on the Router,

cable/DSL modem, and computer. Check the Status tab of the Router’s Web-based Utility to see if you

get an IP address.

6.

I am not able to access the Router’s Web-based Utility Setup page.

A.

Refer to “Problem #4, I want to test my Internet connection” to verify that your computer is properly

connected to the Router.

B.

Refer to “Appendix B: 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.

C.

Set a static IP address on your system; refer to “Problem #3: I need to set a static IP address on a PC.”

D.

Refer to “Problem #12: I am a PPPoE user, and I need to remove the proxy settings or the dial-up pop-up

window.”

7.

I can’t get my Virtual Private Network (VPN) to work through the Router.

Access the Router’s web interface by going to

or the IP address of the Router, and go to

the

Security

=>

VPN Passthrough

tab.

Make sure you have IPsec passthrough and/or PPTP passthrough

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 Router; however, simultaneous IPSec sessions

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

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Appendix A: Troubleshooting

Common Problems and Solutions

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

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

Change the IP address for the Router 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 192.168.15.X (X is a number

from 1 to 254) and your local LAN IP address is 192.168.15.X (X is the same number used in the VPN IP

address), the Router will have difficulties routing information to the right location.

If you change the Router’s

IP address to 192.168.2.1, that should solve the problem. Change the Router’s IP address through the Basic

Setup tab of the Web-based Utility.

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 #9, I need to set up online game hosting or use other Internet applications” for

details. Check the Linksys website at

www.linksys.com

for more information.

8.

I need to set up a server behind my Router.

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 Router’s Web-based Utility. We will be setting up web, ftp, and mail servers.

A.

Access the Router’s Web-based Utility by going to

or the IP address of the Router.

Go to the

Applications & Gaming

=>

Port Range Forwarding

tab.

B.

Enter any name you want to use for the Application.

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Appendix A: Troubleshooting

Common Problems and Solutions

C.

Enter the port range of the service you are using. For example, if you have a web server, you would enter

the range 80 to 80.

D.

Select the protocol you will be using,

TCP

or

UDP

, or select

Both

.

E.

Enter the IP address of the PC or network device that you want the port server to go to. For example, if

the web server’s Ethernet adapter IP address is 192.168.15.100, you would enter 100 in the field

provided. Check “Appendix B: Finding the MAC Address and IP Address for Your Ethernet Adapter” for

details on getting an IP address.

F.

Check the

Enabled

option for the port services you want to use. Consider the examples below:

When you have completed the configuration, click the

Save Settings

button.

9.

I need to set up online game hosting or use other Internet applications.

If you want to play online games or use Internet applications, most will work without doing any port

forwarding or DMZ hosting.

There may be cases when you want to host an online game or Internet

application.

This would require you to set up the Router to deliver incoming packets or data to a specific

computer.

This also applies to the Internet applications you are using. The best way to get the information

on what port services to use is to go to the website of the online game or application you want to use. Follow

these steps to set up online game hosting or use a certain Internet application:

Application

Start and End

Protocol

IP Address

Enabled

Web server

80 to 80

Both

192.168.15.100

X

FTP server

21 to 21

TCP

192.168.15.101

X

SMTP (outgoing)

25 to 25

Both

192.168.15.102

X

POP3 (incoming)

110 to 110

Both

192.168.15.102

X

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