47

Appendix A: Troubleshooting

Common Problems and Solutions

4-Port Gigabit Security Router with VPN

4.

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

A.

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

connected to the Router.

B.

Refer to “Appendix E: 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 #1: I need to set a static IP address.”

D.

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) 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

VPN

=>

VPN Pass Through

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.

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 192.168.1.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

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 #7, 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.

6.

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

Downloaded from

www.Manualslib.com

manuals search engine

48

Appendix A: Troubleshooting

Common Problems and Solutions

4-Port Gigabit Security Router with VPN

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

Setup

=>

Forwarding

tab.

B.

Select the Service from the pull-down menu. If the Service you need is not listed in the menu, click the

Service Management

button to add the new Service Name, and enter the Protocol and Port Range. Click

the

Add to List

button. Then click the

Save Setting

button. Click the

Exit

button.

C.

Enter the IP Address of the server that you want the Internet users to access. For example, if the web

server’s Ethernet adapter IP address is 192.168.1.100, you would enter 100 in the field provided. Check

“Appendix E: Finding the MAC Address and IP Address for Your Ethernet Adapter” for details on getting an

IP address. Then check the

Enable

checkbox for the entry. Consider the examples below:

Application

Start and End

Protocol

IP Address

Enable

D.

Click the

Add to List

button, and configure as many entries as you like.

When you have completed the configuration, click the

Save Settings

button.

7.

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:

A.

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

or the IP address of the Router. Go

to the

Setup

=>

Forwarding

tab.

B.

Select the Service from the pull-down menu. If the Service you need is not listed in the menu, click the

Service Management

button to add the new Service Name, and enter the Protocol and Port Range. For

Web server

80 to 80

Both

192.168.1.100

X

FTP server

21 to 21

TCP

192.168.1.101

X

SMTP (outgoing)

25 to 25

Both

192.168.1.102

X

POP3 (incoming)

110 to 110

Both

192.168.1.102

X

Downloaded from

www.Manualslib.com

manuals search engine

49

Appendix A: Troubleshooting

Common Problems and Solutions

4-Port Gigabit Security Router with VPN

example, if you have a web server, you would enter the range 80 to 80. Click the

Add to List

button. Then

click the

Save Setting

button. Click the

Exit

button.

C.

Enter the IP Address of the server that you want the Internet users to access. For example, if the web

server’s Ethernet adapter IP address is 192.168.1.100, you would enter 100 in the field provided. Check

“Appendix E: Finding the MAC Address and IP Address for Your Ethernet Adapter” for details on getting an

IP address. Then check the

Enable

checkbox for the entry. Consider the examples below:

Application

Start and End

Protocol

IP Address

Enabled

D.

Click the

Add to List

button, and configure as many entries as you like.

When you have completed the configuration, click the

Save Settings

button.

8.

I can’t get the Internet game, server, or application to work.

If you are having difficulties getting any Internet game, server, or application to function properly, consider

exposing one PC to the Internet using DeMilitarized Zone (DMZ) hosting. This option is available when an

application requires too many ports or when you are not sure which port services to use. Make sure you

disable all the forwarding entries if you want to successfully use DMZ hosting, since forwarding has priority

over DMZ hosting. (In other words, data that enters the Router will be checked first by the forwarding settings.

If the port number that the data enters from does not have port forwarding, then the Router will send the data

to whichever PC or network device you set for DMZ hosting.) Follow these steps to set DMZ hosting:

A.

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

or the IP address of the Router. Go

to the

Setup

=>

Forwarding

tab.

B.

Disable or remove the entries you have entered for forwarding. To delete an entry, select it and then click

the

Delete selected application

button. Keep this information in case you want to use it at a later time.

C.

Click the

DMZ Host

tab.

D.

Enter the Ethernet adapter’s IP address of the computer you want exposed to the Internet. This will bypass

the NAT security for that computer. Please refer to “Appendix E: Finding the MAC Address and IP Address

for Your Ethernet Adapter” for details on getting an IP address.

Once completed with the configuration, click the

Save Settings

button.

UT

7777 to 27900

Both

192.168.1.100

X

Halflife

27015 to 27015

Both

192.168.1.105

X

PC Anywhere

5631 to 5631

UDP

192.168.1.102

X

VPN IPSEC

500 to 500

UDP

192.168.1.100

X

Downloaded from

www.Manualslib.com

manuals search engine

50

Appendix A: Troubleshooting

Common Problems and Solutions

4-Port Gigabit Security Router with VPN

9.

I forgot my password, or the password prompt always appears when saving settings to the Router.

Reset the Router to factory defaults by pressing the Reset button for ten seconds and then releasing it. If you

are still getting prompted for a password when saving settings, then perform the following steps:

A.

Access the Router’s web interface by going to

or the IP address of the Router. Enter

the default password admin, and click the

Setup

=>

Password

tab.

B.

Enter the old password in the

Old Password

field.

C.

Enter a different password in the

New Password

field, and enter the new password in the

Confirm New

Password

field to confirm the password.

D.

Click the

Save Settings

button.

10.I am a PPPoE user, and I need to remove the proxy settings or the dial-up pop-up window.

If you have proxy settings, you need to disable these on your computer. Because the Router is the gateway for

the Internet connection, the computer does not need any proxy settings to gain access. Please follow these

directions to verify that you do not have any proxy settings and that the browser you use is set to connect

directly to the LAN.

For Microsoft Internet Explorer 5.0 or higher:

A.

Click

Start

,

Settings

, and

Control Panel

. Double-click

Internet Options

.

B.

Click the

Connections

tab.

C.

Click the

LAN settings

button and remove anything that is checked.

D.

Click the

OK

button to go back to the previous screen.

E.

Click the option

Never dial a connection

. This will remove any dial-up pop-ups for PPPoE users.

For Netscape 4.7 or higher:

A.

Start

Netscape Navigator

, and click

Edit

,

Preferences

,

Advanced

, and

Proxies

.

B.

Make sure you have

Direct connection to the Internet

selected on this screen.

C.

Close all the windows to finish.

11.To start over, I need to set the Router to factory default.

Hold the Reset button for up to 30 seconds and then release it. This will return the password, forwarding, and

other settings on the Router to the factory default settings. In other words, the Router will revert to its original

factory configuration.

12.I need to upgrade the firmware.

In order to upgrade the firmware with the latest features, you need to go to the Linksys website and download

the latest firmware at

www.linksys.com

. Follow these steps:

Downloaded from

www.Manualslib.com

manuals search engine

51

Appendix A: Troubleshooting

Common Problems and Solutions

4-Port Gigabit Security Router with VPN

A.

Go to the Linksys website at

and download the latest firmware, or use the

Web-based Utility to be automatically redirected to the download webpage. Go to System Management -

Firmware Upgrade, and click the

Firmware Download from Linksys Web Site

button. Select the Router

from the pull-down menu and choose the firmware from the options.

B.

Extract the firmware file on your computer.

C.

To upgrade the firmware, follow the steps in the Upgrade section found in “Chapter 6: Setting Up and

Configuring the Router”.

13.The firmware upgrade failed.

The upgrade could have failed for a number of reasons. Follow these steps to upgrade the firmware:

A.

Use the Linksys TFTD program to upgrade the firmware. Go to the Linksys website at

http://

www.linksys.com

and download the TFTP program, which will be listed with the firmware.

B.

Set a static IP address on the PC; refer to “Problem #1, I need to set a static IP address.” Use the following

IP address settings for the computer you are using:

IP Address: 192.168.1.50

Subnet Mask: 255.255.255.0

Gateway: 192.168.1.1

C.

Perform the upgrade using the TFTP utility.

If the firmware upgrade failed, the Router will still work using its current firmware.

14.My DSL service’s PPPoE is always disconnecting.

PPPoE is not actually a dedicated or always-on connection. The DSL ISP can disconnect the service after a

period of inactivity, just like a normal phone dial-up connection to the Internet. There is a setup option to

“keep alive” the connection. This may not always work, so you may need to re-establish connection

periodically.

A.

To connect to the Router, go to the web browser, and enter

or the IP address of the

Router.

B.

Enter the password, if asked. (The default password is admin.)

C.

On the

Basic Setup

tab, select the option

Keep Alive

, and set the

Redial Period

option at

20

(seconds).

D.

Click the

Save Settings

button.

If the connection is lost again, follow steps E and F to re-establish connection.

Downloaded from

www.Manualslib.com

manuals search engine