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Papa Tana papa.tana101 at gmail.comHi, After successfully making libgtpnl works between 02 Linux Host, now I am in the step of connecting one Linux Host to a real live SGSN this morning. I don't have any particular issue at GTP-C side: - the Mobile Station registered on 3G network, requests one activate PDP context to the SGSN - the SGSN sends to my ggsn a create PDP context - my ggsn accepts it, and answers with all the needed information, such as MS_Address, DNS Address 1, DNS address 2, IP of GGSN-C, IP of GGSN-U, TEID Control Plane, TEID user plane, .... everything should be OK. - upon receipt of my creade_pdp_context_response accepted, the SGSN now try to establish a Tunnel with the given TEID towards my GGSN - but I cannot see anything on my GTPU-side in ggsn, apart of several echo-request message from SGSN - Sure, SGSN try to test connectivity to my ggsn GTPU by using echo-request, but no response - I don't know maybe because of no response, or because of SGSN alert me with an error gtpu-sm-cause-update-ggsn-path-failure, the SGSN decide to send a delete request So I have 02 questions please: - 1) At GTP-C, I can implement all messages(echo-response, create-response, delete-response) but at GTPU-side, as the port is used by libgtpnl, I cannot implement an echo-response at all ==> So, do libgtpnl is supposed to answer or not to an echo-response received from a SGSN at GTPU-level? - 2) When I tried a Linux-to-Linux setup, it worked because I specified the ms_addr and sgsn_addr in the 02 Linux Host. But as I cannot configure anything about the tunnel at SGSN-side(done automatically by SGSN), I can only create the tunnel at ggsn-side thanks to my user space program, by passing the TEID and ms_addr input to libgtpnl. Does it mean that libgtpnl only complies with OpenGGSN, ergw, and OpenAirInterface but not intended to ber used with a real SGSN? Thanks for clarifying me, Best Regards, Le lun. 10 août 2020 à 23:00, Harald Welte <laforge at osmocom.org> a écrit : > Hi Papa, > > On Sat, Aug 08, 2020 at 10:59:24AM +0300, Papa Tana wrote: > > It is working now. > > Very simple and stupid mistake from my side at network namespace > configuration. > > I'm very happy to hear it's working successfully. Sometimes I start to > doubt > if there are problems in the codebase, but the fact that you report you > got it > to work is a relief in that regard :) > -- > - Harald Welte <laforge at osmocom.org> > http://laforge.gnumonks.org/ > > ============================================================================ > "Privacy in residential applications is a desirable marketing option." > (ETSI EN 300 175-7 Ch. > A6) > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-net-gprs/attachments/20200820/e461d830/attachment.htm>