Small Business VOIP Router: Problems with Access to Some Websites

Introduction
How can I access some websites using the Linksys VOIP router?
Related Information

Introduction

This article is one in a series to assist in the setup, troubleshooting, and maintenance of Cisco Small Business products.

Q. How do I access some websites using the Cisco Small Business VoIP router?

Inability to access certain websites is due to three main factors:

Security on the web browser is set too high
MTU not set on the router properly
Secured websites

Lower Security Settings on Internet Explorer

Step 1:
Double-click Internet Explorer, and click Tools.
Step 2:
Select Internet Options, click Security > Custom Level. A window similar to Step 3 will appear.
Step 3:
Under the Reset to drop-down menu, select Medium-Low, and click OK.

Note: If this did not work, enable the MTU on the ADSL gateway. For instructions, complete the steps in the next section.

Enable MTU on the VoIP Router

Step 1:
Determine the proper MTU size for the website.
Step 2:
Access the router's web-based setup page. For instructions, click here.
Step 3:
When the router's web-based setup page appears, look for MTU and set it to Manual. In the Size field, enter the MTU value you obtained from Step 1.

Note: Here are the recommended MTU sizes for DSL and Cable Connection:
Cable Connection: 1500
PPPoE DSL Connection: 1492
Step 4:

Click .

Note: If this did not work, complete the steps in the next section in order to open ports on the router.

Open Ports for Secured Sites

Step 1:
Access the router's web-based setup page. For instructions, click here.
Step 2:
When the router's web-based setup page appears, click Applications & Gaming > Port Triggering.
Step 3:
Under Application, type "https", and in the Triggered Range and Forwarded Range fields, type "443" (the port being used by https).
Step 4:

Click .