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@tpip.net wrote:

Hi Alandre,

----- On Apr 4, 2017, at 6:32 PM, Alandre de Carvalho alandrecm@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