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Re: [v6ops] [*SPAM* Score/Req: 3.9/3.3] Re: [*SPAM* Score/Req: 3.9/3.3] Re: reclassify 464XLAT as standard instead of info

Mikael Abrahamsson <swmike@swm.pp.se> Thu, 21 September 2017 15:07 UTC

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Date: Thu, 21 Sep 2017 17:07:34 +0200
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
cc: Ca By <cb.list6@gmail.com>, Owen DeLong <owen@delong.com>, v6ops@ietf.org
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Subject: Re: [v6ops] [*SPAM* Score/Req: 3.9/3.3] Re: [*SPAM* Score/Req: 3.9/3.3] Re: reclassify 464XLAT as standard instead of info
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On Thu, 21 Sep 2017, Alexandre Petrescu wrote:

> So I understand from three different persons that UE does not use GTP.
>
> If nobody else tries, I will have to ask the modem manufacturer.

Correct. The RLC layer is what's run over the "radio". The GTP tunnel 
header is taken out before it enters this, because it's kind of its own 
"tunnel".

It's the same misconception that there is PPP in 3GPP networks. There 
isn't, it's just an abstraction between the UE baseband and the operating 
system.

3G:
GTP between GGSN-SGSN-RNC.
RLC between RNC-enodb-UE baseband.

4G:
GTP between SPGW-enodb
RLC between enodb-UE baseband.

Then the baseband can have all kinds of interfaces to handoff packets to 
the kernel. It can pretend to be an ethernet bridge, it can pretend to be 
PPP tunnel, I'm sure it can pretend to be other things.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se

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