How to change the MTU on a Linksys router ?
An appropriate MTU value is important to the proper operation of any network. To change the MTU on a BEFSR series Linksys routers, simply follow the steps below:
1. Connect to your router's admin interface. Usually 192.168.1.1. The default username is blank, default password is "admin" (without the quotes).
2. Click on the Advanced tab from the menu.
3. Select the Filters tab and find "MTU" towards the bottom. Select "Enable", enter your desired MTU value (usually 1500, or 1492 for PPPoE) in the text field on the right, and click Apply. The router will restart to apply the new settings.