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50
Appendix A: Troubleshooting
Common Problems and Solutions
Wireless-N ADSL2+ Gateway
Appendix A: Troubleshooting
This appendix consists of two parts: “Common Problems and Solutions” and “Frequently Asked Questions.”
Provided are possible solutions to problems that may occur during the installation and operation of the Gateway.
Read the descriptions below to help you solve your problems. If you can’t find an answer here, check the Linksys
international website at www.linksys.com.
Common Problems and Solutions
1.
I need to set a static IP address on a computer.
You can assign a static IP address to a computer by performing the following steps:
•
For Windows 98 and Me:
1.
Click
Start
,
Settings
, and
Control Panel
. Double-click
Network
.
2.
In The following network components are installed box, select the TCP/IP-> associated with your
Ethernet adapter. If you only have one Ethernet adapter installed, you will only see one TCP/IP line
with no association to an Ethernet adapter. Highlight it and click the Properties button.
3.
In the TCP/IP properties window, select the IP address tab, and select Specify an IP address. Enter a
unique IP address that is not used by any other computer on the network connected to the Gateway.
Make sure that each IP address is unique for each computer or network device.
4.
Click the
Gateway
tab, and in the New Gateway prompt, enter 192.168.1.1, which is the default IP
address of the Gateway. Click the Add button to accept the entry.
5.
Click the
DNS
tab, and make sure the DNS Enabled option is selected. Enter the Host and Domain
names (e.g., John for Host and home for Domain). Enter the DNS entry provided by your ISP. If your
ISP has not provided the DNS IP address, contact your ISP to get that information or go to its website
for the information.
6.
Click the
OK
button in the TCP/IP properties window, and click
Close
or
the
OK
button for the
Network window.
7.
Restart the computer when asked.
•
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. Select
Use the following IP address
option.
4.
Enter a unique IP address that is not used by any other computer on the network connected to the
Gateway.
5.
Enter the Subnet Mask, 255.255.255.0.
6.
Enter the Default Gateway, 192.168.1.1 (Gateway’s default IP address).
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51
Appendix A: Troubleshooting
Common Problems and Solutions
Wireless-N ADSL2+ Gateway
7.
Toward the bottom of the window, select Use the following DNS server addresses, and enter the
Preferred DNS server and Alternative DNS server (provided by your ISP). Contact your ISP or go on its
website to find the information.
8.
Click the
OK
button in the Internet Protocol (TCP/IP) Properties window, and click the
OK
button in the
Local Area Connection Properties window.
9.
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)
. Click
the
Properties
button.
5.
Enter a unique IP address that is not used by any other computer on the network connected to the
Gateway.
6.
Enter the Subnet Mask, 255.255.255.0.
7.
Enter the Default Gateway, 192.168.1.1 (Gateway’s default IP address).
8.
Toward the bottom of the window, select Use the following DNS server addresses, and enter the
Preferred DNS server and Alternative DNS server (provided by your ISP). Contact your ISP or go on its
website to find the information.
9.
Click the
OK
button in the Internet Protocol (TCP/IP) Properties window. Click the
OK
button in the
Local Area Connection Properties window.
2.
I want to test my Internet connection.
A.
Check your TCP/IP settings.
For Windows 98, Me, 2000, and XP:
•
Refer to Windows Help for details. Make sure Obtain IP address automatically is selected in the settings.
For Windows NT 4.0:
•
Click
Start
,
Setting
s, and
Control Panel
. Double-click the
Network
icon.
•
Click the Protocol tab, and double-click on TCP/IP Protocol.
•
When the window appears, make sure you have selected the correct Adapter for your Ethernet adapter
and set it for
Obtain an IP address
from a DHCP server.
•
Click the
OK
button in the TCP/IP Protocol Properties window, and click the
Close
button in the Network
window.
•
Restart the computer if asked.
B.
Open a command prompt.
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52
Appendix A: Troubleshooting
Common Problems and Solutions
Wireless-N ADSL2+ Gateway
For Windows 98 and Me:
•
Click
Start
and
Run
. In the Open field, type in command. Press the
Enter
key or click the
OK
button.
For Windows NT, 2000, and XP:
•
Click
Star
t and
Run
. In the Open field, type cmd. Press the
Enter
key or click the
OK
button. In the
command prompt, type ping 192.168.1.1 and press the Enter key.
•
If you get a reply, the computer is communicating with the Gateway.
•
If you do NOT get a reply, please check the cable, and make sure Obtain an IP address automatically is
selected in the TCP/IP settings for your Ethernet adapter.
C.
In the command prompt, type ping followed by your Internet or WAN IP address and press the
Enter
key.
The Internet or WAN IP Address can be found on the Status screen of the Gateway’s Web-based Utility. For
example, if your Internet or WAN 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 Gateway.
•
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.
D.
In the command prompt, type ping www.yahoo.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.
•
Refer to “Problem #2, I want to test my Internet connection” to verify that you have connectivity.
1.
Make sure you are using the right Internet connection settings. Contact your ISP to see if your Internet
connection type is RFC 1483 Bridged, RFC 1483 Routed, RFC 2516 PPPoE, RFC 2364 PPPoA, Bridged
Mode Only, or IPoA. Please refer to the Setup section of “Chapter 5: Configuring the Wireless-N
ADSL2+ Gateway” for details on Internet connection settings.
2.
Make sure you have the right cable. Check to see if the Gateway column has a solidly lit ADSL LED.
3.
Make sure the cable connecting from your Gateway’s DSL port is connected to the wall jack of the
ADSL service line. Verify that the Status page of the Gateway’s Web-based Utility shows a valid IP
address from your ISP.
4.
Turn off the computer and Gateway. Wait 30 seconds, and then turn on the Gateway, and computer.
Check the Status tab of the Gateway’s Web-based Utility to see if you get an IP address.
4.
I am not able to access the Setup page of the Gateway’s Web-based Utility.
•
Refer to “Problem #2, I want to test my Internet connection” to verify that your computer is properly
connected to the Gateway.
1.
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.
2.
Set a static IP address on your system; refer to “Problem #1: I need to set a static IP address.”
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53
Appendix A: Troubleshooting
Common Problems and Solutions
Wireless-N ADSL2+ Gateway
3.
Refer to “Problem #10: I am a PPPoE user, and I need to remove the proxy settings or the dial-up pop-
up window.”
5.
I can’t get my Virtual Private Network (VPN) working through the Gateway.
Access the Gateway’s web interface by going to http://192.168.1.1 or the IP address of the Gateway, and go
to the Security tab.
Make sure you have IPsec passthrough and/or PPTP pass-through 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 Gateway; 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
Gateway.
AH has limitations due to occasional incompatibility with the NAT standard.
•
Change the IP address for the Gateway 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 Gateway will have difficulties routing information to the right location.
If you change
the Gateway’s IP address to 192.168.2.1, that should solve the problem. Change the Gateway’s IP address
through the Setup tab of the web interface.
•
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 international website for more information at www.linksys.com.
6.
I need to set up a server behind my Gateway and make it available to the public.
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 Gateway’s Web-based Utility. We will be setting
up web, ftp, and mail servers.
1.
Access the Gateway’s Web-based Utility by going to http://192.168.1.1 or the IP address of the
Gateway. Go to the Applications and Gaming => Port Range Forwarding tab.
2.
Enter any name you want to use for the Application.
3.
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.
4.
Select the protocol you will be using, TCP and/or UDP.
5.
Enter the IP address of the computer or network device that you want the port server to go to. For
example, if the web server’s Ethernet adapter IP address is 192.168.1.100, you would enter 100 in the
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Appendix A: Troubleshooting
Common Problems and Solutions
Wireless-N ADSL2+ Gateway
field provided. Check “Appendix C: Finding the MAC Address and IP Address for Your Ethernet
Adapter” for details on getting an IP address.
6.
Check the
Enable
option for the port services you want to use. Consider the example 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 Gateway 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:
1.
Access the Gateway’s web interface by going to http://192.168.1.1 or the IP address of the Gateway.
Go to the Applications and Gaming => Port Range Forwarding tab.
2.
Enter any name you want to use for the Application.
3.
Enter the port range of the service you are using. For example, if you want to host Unreal Tournament
(UT), you would enter the range 7777 to 27900.
4.
Select the protocol you will be using, TCP and/or UDP.
5.
Enter the IP address of the computer or network device that you want the port server to go to. For
example, if the web server’s Ethernet adapter IP address is 192.168.1.100, 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.
6.
Check the
Enable
option for the port services you want to use. Consider the example below:
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
Application
Start and End
Protocol
IP Address
Enable
UT
7777 to 27900
Both
192.168.1.100
X
Halflife
27015 to 27015
Both
192.168.1.105
X

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