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Papa Tana papa.tana101 at gmail.comWell, After debugging, it is more likely to have some bug in my code because finally, it works after several scenario, but for some reason I don't understand so far, after a moment, the SGSN requests to delete the pdp context. So, I was connected with a real sim card for around 1 minute, great! But I still need a clarification about what to do about echo-response at GTP-U because I can only handle echo-response at GTP-C because my ggsn listen in 2123, but I cannot add any message at all like echo-response in 2152 because libgtpnl manage it. Best Regards, Le jeu. 20 août 2020 à 12:49, Papa Tana <papa.tana101 at gmail.com> a écrit : > Hi, > > 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/20200820/27f6ad0b/attachment.htm>