L2TP MTU: Difference between revisions

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The payload size (MTU) of traffic going through the L2TP tunnel will be lower than that of the underlying ISP - this is due to the extra 'headers' that are applied to make the tunnel.

 

* Generally, the L2TP MTU would be 38 bytes less than the MTU you have on the underlying internet connection.

 

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* In theory fragments will work to allow 1500 MTU on our service, but fragments are inefficient, and if everyone sends fragmented packets that could degrade the service.

 

Here's a breakdown of the headers and the bytes used. This is using a standard PPP broadband connection where traffic through the ISP is 1492