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[Andei POPOV <nyandoma@xxxxxxxxx>]

Hello everyone,

While  carrying  out a series of experiments I faced a problem when at
some point Satellite Terminal stops working.
The  testbed  topology  is  presented in the attached file. I generate
multiple  traffic  flows (1 to 9) from  the  Sender  to  the  Receiver  in the
direction  from GW to ST using iperf with MSS = 1400 bytes. The buffer
of the GW (max_fifo) reduced to the value of 2500.
At  some  point  of the experiments (after 40-100 seconds form flow(s)
start)  the  ST  stops  processing  traffic (sometimes ST indicator in
OpenSand  Manager  turns red, sometimes it's still green but TCP flows
don't flow).
In  the  core.log  I  see  the  following  errors after which ST stops
working:

Jul 24 15:28:40 router st: [encap] [Mpeg.cpp:deencapsulate():193] ERR: [Mpeg::Context::deencapsulate] cannot create a burst of packets, drop packet
Jul 24 15:28:42 router st: [encap] [Mpeg.cpp:deencapMpeg():515] ERR: [Mpeg::Context::deencapMpeg] MPEG frame(s) lost (MPEG CC = 12, CTXT CC = 8), reset context, sync on PUSI
Jul 24 15:28:42 router st: [encap] [Mpeg.cpp:deencapMpeg():515] ERR: [Mpeg::Context::deencapMpeg] MPEG frame(s) lost (MPEG CC = 15, CTXT CC = 2), reset context, sync on PUSI
Jul 24 15:28:43 router st: [dvb_rcs_tal] [bloc_dvb_rcs_tal.cpp:connectToQoSServer():1138] [Tal][BlocDVBRcsTal::connectToQoSServer] service on TCP/12000 is not available
Jul 24 15:28:44 router st: [encap] [Mpeg.cpp:deencapMpeg():536] ERR: [Mpeg::Context::deencapMpeg] PUSI not set in current MPEG frame, drop it
.............................
Jul 24 15:28:56 router st: [encap] [../../src/common/IpPacketHandler.h:build():89] ERR: [IpPacketHandler::build] cannot get IP version
Jul 24 15:28:56 router st: [encap] [Ule.cpp:deencapUle():397] ERR: [Ule::Context::deencapUle] cannot create a IP packet, drop the ULE packet
Jul 24 15:28:56 router st: [encap] [Ule.cpp:deencapsulate():191] ERR: [Ule::Context::deencapsulate] cannot create a burst of packets, drop packet
Jul 24 15:28:56 router st: [encap] [../../src/common/IpPacketHandler.h:build():89]

Could you please tell me what can cause this problem?
Thank you.

Best regards,
Andrei

Attachment: OpenSand_Topo.PNG
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