not working

By | 18 Mar 2009

If you have a router and Internet works with any application/site but you can’t connect to any site (e.g. WindowsUpdate, Windows Live Messenger [error code: 81000306], etc.) you might have your MTU set to a too high value. The default MTU for ethernet devices is 1500 but since the PPPoE header adds 8 Bytes to the packets, they get fragmented. And the servers seem to not accept fragmented packets.

So the solution is to set your MTU to the best value for PPPoE: 1492. To do this, use a tool like the TCP Optimizer to set the MTU for your ethernet device to 1492. After a reboot, all pages should work again – including Windows Live Messenger.

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