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Mobile L2TP Technical: Difference between revisions
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__NOTOC__<indicator name="L2TP">[[File:Menu-L2TP.svg|link=:Category:L2TP|30px|Back up to the L2TP Category]]</indicator>
An L2TP tunnel is established using the pre-agreed IP addresses, hostname and shared secret. Note that if your LNS rejects the tunnel connection, or fails to respond to the SCCRQ or a subsequent HELLO, then it will be
Once the tunnel is established, a session is established for each connecting data SIM.
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==ICCN==
{|class="wikitable"
! Attribute || || Meaning
|-
| Framing Type || 19 || Always 1 (PPP)
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| Initial Received LCP CONFREQ || 26 || As received / negotiated by proxy
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| Last Sent LCP CONFREQ || 27 || As sent / negotiated by proxy
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| Last Received LCP CONFREQ || 28 || As received / negotiated by proxy
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| Proxy Authen Type || 29 || Will always be CHAP
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| Proxy Authen Name || 30 || User name from mobile device, typically blank
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| Proxy Authen Challenge || 31 || Chap challenge
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| Proxy Authen ID || 32 || Chap challenge ID
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| Proxy Authen Response || 33 || Chap response hash
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| Tx connect speed || 24 || Present if advised by mobile network
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| Rx connect speed || 38 || Present if advised by mobile network
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==Limitations==
==Connect Speed==
We've seen various devices give odd Connect Speed settings when they connect. EG, OSX sends:
Connect Speed: 1000000
And a Pfsense has been seen to send 10Mbit/s and even the source code had it hard coded to 10Mbit/s.
[[File:L2TP OS X speed weirdness.png|thumbnail|TCP Dump of OSX L2TP highlighting the 'Connect Speed']]
This means that it is asking for a 1Mbit/s connection. This does not looks like it's configurable either.
From May 2016 we ignore the Connect Speed, and simply limit the speed to 100Mbit/s at our side.
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