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Max msuraev at sysmocom.deHi! Thanks for your feedback. Seems like a bug indeed. Could you please make a ticket via https://osmocom.org/projects/openggsn/issues/new (registration sould be quick and easy if you don't have one yet). Would be great if you could share more details in the ticket as well: - your configs - how to trigger this error indication reliably - any spec. reference for proper behavior - whatever else you think is relevant 11.11.18 07:00, Pierre Kim пишет: > After some debugging I found that the intermittent data loss was caused > by the GSN not properly reacting to Error Indication packets. > > From GGSN: > > <0002> ggsn.c:809 PDP(450091417013617:5): Packet received on > APN(internet): forwarding to tun apn0 > <000d> gtp.c:2681 Packet from 192.168.27.49:2152, length: 24 content: 32 > 1a 00 10 00 00 00 00 40 8e 00 00 10 00 00 00 05 85 00 04 c0 a8 1b 31 : > Received Error Indication > <0002> ggsn.c:372 PDP(450091417013617:5): Deleting PDP context > <000d> pdp.c:255 Begin pdp_tiddel tid = 5716310714190054 > <000d> pdp.c:262 End pdp_tiddel: PDP found > > > When the GGSN receives an error indication, isnt' it supposed to > acknowlege the SGSN and attempt to reinitialize the connection? In my > case the GGSN simply deleted the PDP context locally and both SGSN and > GGSN gets flooded by unknown PDP context error, while the phone keeps > trying to transmit data. > > Tested on lastest git version and lastest release version: osmo-sgsn > 1.3.0, osmo-ggsn 1.2.1 > > > Regards, > > Pierre > > -- - Max Suraev <msuraev at sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Directors: Harald Welte