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88
Appendix A: Troubleshooting
Common Problems and Solutions
Wireless-N Gigabit Security Router with VPN
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.
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.
3.
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 E:
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 Basic
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 System Summary tab of the Router’s Web-based Utility to
see if you get an IP address.
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Appendix A: Troubleshooting
Common Problems and Solutions
Wireless-N 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
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90
Appendix A: Troubleshooting
Common Problems and Solutions
Wireless-N 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
Firewall
=>
Single Port
Forwarding
tab.
B.
Enable one of the pre-defined applications in the Table or you can add or modify existing entries for your
application.
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:
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
Firewall
=>
Port Range Forwarding
tab.
B.
Enter the Service Application Name, Range of Port used by this Application, and Layer 4 Protocol used by
this Application to the Table.
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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91
Appendix A: Troubleshooting
Common Problems and Solutions
Wireless-N Gigabit Security Router with VPN
“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:
D.
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
Firewall
=>
Single Port Forwarding
tab.
B.
Disable or remove the entries you have entered for forwarding. Keep this information in case you want to
use it at a later time.
C.
Go to the
Setup
=>
DMZ
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.
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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92
Appendix A: Troubleshooting
Common Problems and Solutions
Wireless-N 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
Administration
=>
Management
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:
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