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