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85
Appendix A: Troubleshooting
Common Problems and Solutions
10/100 16-Port VPN Router
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. 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.
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
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.
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86
Appendix A: Troubleshooting
Common Problems and Solutions
10/100 16-Port VPN Router
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.
6.
I am not getting an IP address on the Internet with my Internet connection.
A.
Refer to “Problem #2, 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 C:
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 6: Setting up
and Configuring the Router” for details.
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 Setup
section of “Chapter 6: Setting up and 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.
7.
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 C: 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).”
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87
Appendix A: Troubleshooting
Common Problems and Solutions
10/100 16-Port VPN Router
8.
I am using VPN client software on my computer, and I can’t get my Virtual Private Network (VPN)
tunnel to pass 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, PPTP, and/or L2TP passthrough enabled.
VPNs that use IPSec with 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 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 2 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.
9.
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.
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.
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88
Appendix A: Troubleshooting
Common Problems and Solutions
10/100 16-Port VPN Router
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 C: 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:
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.
10.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
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
Application
Start and End
Protocol
IP Address
Enable
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
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89
Appendix A: Troubleshooting
Common Problems and Solutions
10/100 16-Port VPN Router
“Appendix C: 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:
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.
11.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 C: 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.
12.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:
Application
Start and End
Protocol
IP Address
Enabled
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
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