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Page 66 / 116 Scroll up to view Page 61 - 65
Wireless-G Broadband Router with 2 Phone Ports
58
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
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 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 5:
Configuring the Router” for details.
Page 67 / 116
Wireless-G Broadband Router with 2 Phone Ports
59
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 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 #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.
Page 68 / 116
Wireless-G Broadband Router with 2 Phone Ports
60
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.
Page 69 / 116
Wireless-G Broadband Router with 2 Phone Ports
61
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 C: 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
Page 70 / 116
Wireless-G Broadband Router with 2 Phone Ports
62
Appendix A: Troubleshooting
Common Problems and Solutions
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.
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 C: 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.
10. 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
Start and End
Protocol
IP Address
Enabled
UT
7777 to 27900
Both
192.168.15.100
X
Halflife
27015 to 27015
Both
192.168.15.105
X
PC Anywhere
5631 to 5631
UDP
192.168.15.102
X
VPN IPSEC
500 to 500
UDP
192.168.15.100
X

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