Troubleshooting
Cisco RVS4000 Security Router with VPN Administrator Guide 126
A
I can’t access my email, web, or VPN, or I am getting corrupted data
from the Internet.
You may need to adjust the Maximum Transmission Unit (MTU) setting. By default,
the MTU is set at 1500. For most DSL users, it is strongly recommended to use
MTU 1492. If you have difficulties, perform these steps:
STEP 1 To connect to the router, go to the web browser, and enter http://192.168.1.1 or
the IP address of the router.
STEP 2 Enter the password, if asked (the default password is admin).
STEP 3 Go to the Setup > WAN menu.
STEP 4 Look for the MTU option, and select Manual. In the Size field, enter 1492.
STEP 5 Click Save to continue.
STEP 6 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
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:
STEP 1 To connect to the router, go to the web browser, and enter http://192.168.1.1 or
the IP address of the router.
STEP 2 Enter the password, if asked (the default password is admin).
STEP 3 Click Firewall > Port Range Triggering.
STEP 4 Enter any name you want to use for the Application Name.
STEP 5 Enter the Start and End Ports of the Triggered Range. Check with your Internet
application provider for more information on which outgoing port services it uses.
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