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Appendix A: Troubleshooting
Common Problems and Solutions
Broadband Firewall Router with 4-Port Switch/VPN Endpoint
15. I can't access my email, web, or VPN, or I am getting corrupted data from the Internet.
The Maximum Transmission Unit (MTU) setting may need to be adjusted. By default, the MTU is set at 1500.
Most DSL users should use MTU 1492. If you are having some difficulties, perform the following steps:
A. To connect to the Router, go to the web browser, and enter
http://192.168.1.1
or the IP address of the
Router.
B. Enter the password, if asked. (The default password is
admin
.)
C. On the
Basic Setup
tab, look for the MTU option, and select
Enable
. In the
Size
field, enter 1492.
D. Click the
Save Settings
button to continue.
If your difficulties continue, change the Size to different values. Try this list of values, one value at a time, in
this order, until your problem is solved:
1462
1400
1362
1300
16. I need to use port triggering.
Port triggering looks at the outgoing port services used and will trigger the Router to open a specific port,
depending on which port an Internet application uses. Follow these steps:
A. To connect to the Router, go to the web browser, and enter
http://192.168.1.1
or the IP address of the
Router.
B. Enter the password, if asked. (The default password is
admin
.)
C. Click the
Applications & Gaming
=>
Port Triggering
tab.
D. Enter any name you want to use for the Application Name.
E. Enter the
Start
and
End
Ports of the Triggered Port Range. Check with your Internet application provider
for more information on which outgoing port services it is using.
17. When I enter a URL or IP address, I get a time-out error or am prompted to retry.
• 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 Router. Ensure that it is connected and
powered on. Connect to it and check its settings. (If you cannot connect to it, check the network and
power connections.)
• If the Router is configured correctly, check your Internet connection (DSL/cable modem, etc.) to see if it is
working correctly. You can remove the Router 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
.