Category:Incoming L2TP: Difference between revisions
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=== MTU === |
=== MTU === |
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The payload |
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* Generally, the L2TP MTU would be 38 bytes less than the MTU you have on the underlying internet connection. |
* 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. |
* 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. |
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'''Technical Breakdown:''' |
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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 |
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Ethernet 1500 1500 |
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802.11Q* - 4* 1500 (* Treated as part of the ethernet header and doesn't affect the MTU) |
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PPPoE - 6 1494 |
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PPP - 2 1492 <-- the MTU of the underlying internet connection |
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IPv4 - 20 1472 |
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UDP - 8 1464 |
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L2TP - 6 1458 |
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(HDLC) - 2 1456 |
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PPP - 2 1454 <-- the MTU of the L2TP service |
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=== Port forwarding on some 'Mobile Broadband' routers === |
=== Port forwarding on some 'Mobile Broadband' routers === |
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