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Alandre De Carvalho alandrecm at tipbrasil.com.brHi 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