GTP echo response

Alandre De Carvalho alandrecm at tipbrasil.com.br
Wed Apr 5 10:51:29 UTC 2017


Hi Andreas,

Thanks for your responde. I'm going to check on OAI.

Thank you 

Alandre

Sent from my iPhone

> On 5 Apr 2017, at 07:26, Andreas Schultz <aschultz at tpip.net> wrote:
> 
> Hi Alandre,
> 
> ----- On Apr 4, 2017, at 6:32 PM, Alandre de Carvalho alandrecm at tipbrasil.com.br wrote:
> 
>> Hi everyone,
> 
>> We’re using kernel GTP developed by Osmocom on openair-cn. Turns out that we are
>> not able to connect an UE for longer than 20 seconds using an ZTE eNB
>> apparently because the GTP-U is not answering to the echo requests. As far I
>> know this response is supposed to be implemented but it is not answering. Do
>> you guys have any tips on this issue?
> 
> I don't know how OpenAir-CN uses the kernel module, but Echo handling
> is not part of the kernel implementation. 
> 
> The kernel will pass all GTP-U packets that do not match a PDP context
> (this applies to Echo Request) up to the user space management process
> which then has to generate the proper response. 
> 
> Your problem feels a bit like the OAI-CN userspace is not handling the
> echo requests. Maybe it's not implemented? 
> 
> Regards 
> Andreas 
> 
>> Thanks in advance,
> 
>> Alandre



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