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Page 81 / 127 Scroll up to view Page 76 - 80
74
Appendix A: Troubleshooting
Common Problems and Solutions
IP Telephony System
C.
In the command prompt, type
and press the
Enter
key.
•
If you get a reply, the computer is communicating with the System.
•
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 IP Telephony System. 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 System.
•
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.
11.I am not getting an IP address on the Internet with my Internet connection.
A.
Refer to “Problem #10, 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 System, see the Router - WAN Setup - MAC Clone Settings section of
“Chapter 6: Using the Web-based Utility.”
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).
Refer to the
Router - WAN Setup - Internet Connection Settings section of “Chapter 6: Using the Web-based Utility.”
D.
Make sure you use the right cable. Check to see if the LEDs for the Internet port are lit.
E.
Make sure the cable connecting from your cable or DSL modem is connected to the Internet port of the
System or your network router. Verify that the Router - Status page of the System’s Web-based Utility
shows a valid IP address from your ISP.
F.
Power off your network devices, including the System, cable/DSL modem, and router (if you have a
separate router). Wait 30 seconds, and power on the cable/DSL modem first. Then power on the router (if
used), System, and other network devices. Check the Router - Status tab of the System’s Web-based
Utility to see if you get an IP address.
Page 82 / 127
75
Appendix A: Troubleshooting
Common Problems and Solutions
IP Telephony System
12.I am not able to access the System’s Web-based Utility Setup page.
A.
Refer to “Problem #10, I want to test my Internet connection” to verify that your computer is properly
connected to the System.
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 #9: I need to set a static IP address on a PC.”
D.
Refer to “Problem #17: I am a PPPoE user, and I need to remove the proxy settings or the dial-up pop-up
window.”
13.I can’t get my Virtual Private Network (VPN) to work through the System.
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 System; 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 System.
AH has limitations due to occasional incompatibility with the NAT standard.
Change the IP address for the System 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 192.168.0.X (X is a number from
1 to 254) and your local LAN IP address is 192.168.0.X (X is the same number used in the VPN IP address), the
System will have difficulties routing information to the right location. If you change the System’s IP address to
192.168.2.1, that should solve the problem. Change the System’s IP address through the Router - LAN 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 #15, 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.
14.I need to set up a server behind my System.
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 System’s Web-based Utility. We will be setting up web, ftp, and mail servers.
A.
Access the System’s Web-based Utility by going to
or the IP address of the System.
Go to the
Router
=>
Application
tab.
B.
Select
yes
from the
Enable
drop-down menu.
Page 83 / 127
76
Appendix A: Troubleshooting
Common Problems and Solutions
IP Telephony System
C.
Enter any name you want to use for the service.
D.
Enter the port range of the service you are using. For example, if you have a web server, you would enter
the range 80 (in the
Starting Port
field) to 80 (in the
Ending Port
field).
E.
Select the protocol you will be using,
TCP
or
UDP
, or select
Both
.
F.
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 192.168.0.100, 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.
G.
Follow the instructions in steps B-F for the port services you want to use. Consider the examples below:
When you have completed the configuration, click the
Submit All Changes
button.
15.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 System 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 System’s Web-based Utility by going to
or the IP address of the System.
Go to the
Router
=>
Application
tab.
B.
Enter any name you want to use for the Application.
C.
Select
yes
from the
Enable
drop-down menu.
D.
Enter any name you want to use for the service.
E.
Enter the port range of the service you are using. For example, if you have a web server, you would enter
the range 80 (in the
Starting Port
field) to 80 (in the
Ending Port
field).
F.
Select the protocol you will be using,
TCP
or
UDP
, or select
Both
.
Enable
Service Name
Starting and
Ending Ports
Protocol
IP Address
yes
Web server
80 to 80
Both
192.168.0.100
yes
FTP server
21 to 21
TCP
192.168.0.101
yes
SMTP (outgoing)
25 to 25
Both
192.168.0.102
yes
POP3 (incoming)
110 to 110
Both
192.168.0.102
Page 84 / 127
77
Appendix A: Troubleshooting
Common Problems and Solutions
IP Telephony System
G.
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 192.168.0.100, 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.
H.
Check the
Enabled
option for the port services you want to use. Consider the examples below:
When you have completed the configuration, click the
Submit All Changes
button.
16.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 System will be checked first by the forwarding
settings. If the port number that the data enters from does not have port forwarding, then the System 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 System’s Web-based Utility by going to
or the IP address of the System.
Go to the
Router
=>
Application
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.
Select
yes
from the
Enable DMZ
drop-down menu.
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
Submit All Changes
button.
Enable
Application
Starting and
Ending Ports
Protocol
IP Address
yes
UT
7777 to 27900
Both
192.168.0.100
yes
Halflife
27015 to 27015
Both
192.168.0.105
yes
PC Anywhere
5631 to 5631
UDP
192.168.0.102
yes
VPN IPSEC
500 to 500
UDP
192.168.0.100
Page 85 / 127
78
Appendix A: Troubleshooting
Common Problems and Solutions
IP Telephony System
17.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 System is the gateway
Internet access, the computer does not need proxy settings to gain access. 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.
18.To start over, I need to set the System to its factory default settings.
Refer to “Chapter 5: Using the Interactive Voice Response Menu” for instructions.
19.I need to upgrade the firmware.
Firmware upgrades are handled by your ITSP. Contact your service provider for more information.
20.When I enter a URL or IP address, I get a time-out error or am prompted to retry.
Go through this checklist until your problem is solved:
•
Check if other PCs work. If they do, ensure that your workstation’s IP settings are correct (IP Address,
Subnet Mask, Default Gateway, and DNS). Restart the computer that is having a problem.
•
If the PCs are configured correctly, but still not working, check the System. Make sure that it is connected
and powered on. Check its settings. (If you cannot connect to it, check the LAN and power connections.)
•
If you have a separate router, check the router. Make sure that it is connected and powered on. Check its
settings. (If you cannot connect to it, check the LAN and power connections.)
•
Check your Internet connection (DSL/cable modem) to see if it is working correctly. You can remove the
System and router (if used) to verify a direct connection.
•
Manually configure the TCP/IP with a DNS address provided by your ISP.
•
Make sure that your browser is set to connect directly and that any dial-up is disabled. For Internet
Explorer, click
Tools
,
Internet Options
, and then the
Connection
tab. Make sure that Internet Explorer is
set to
Never dial a connection
. For Netscape Navigator, click
Edit
,
Preferences
,
Advanced
, and
Proxy
.
Make sure that Netscape Navigator is set to
Direct connection to the Internet
.

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