Cellular Network Infrastructure » Core Network (CN) » OsmoSGSN

latest version for Ubuntu 20.04
usrp b210

i'm trying to ping (with -s 230) my device, but after few minutes, I'd get messages saying about deleting pdp context and deleting sgsn.

root@ubnt:/etc/osmocom# ping -s 230 192.168.2.1

<0002> ggsn.c:858 GGSN(ggsn0): Successfully started
<0005> telnet_interface.c:88 Available via telnet 127.0.0.1 4260
<000c> control_if.c:1014 CTRL at 127.0.0.1 4257
<0002> sgsn.c:83 SGSN(127.0.0.1): Discovered
<0002> pco.c:220 PDP(MyIMSI:5): Unknown/Unimplemented PCO Protocol 0x0005: 
<0002> ggsn.c:569 PDP(MyIMSI:5): Successful PDP Context Creation: APN=internet(internet), TEIC=1, IPv4=192.168.2.1, IPv6=none
<0002> ggsn.c:354 PDP(MyIMSI:5): Deleting PDP context
<0002> sgsn.c:21 SGSN(127.0.0.1): Deleting SGSN

<0005> gprs_llc_parse.c:78 LLC SAPI=3 C   U GEA0 IOV-UI=0x000000 FCS=0x779bac CMD=UI DATA 
<0004> sgsn_libgtp.c:744 GTP DATA IND from GGSN for MyIMSI, length=258
<0005> gprs_llc_parse.c:78 LLC SAPI=3 C   U GEA0 IOV-UI=0x000000 FCS=0xc5ab23 CMD=UI DATA 
<0004> sgsn_libgtp.c:744 GTP DATA IND from GGSN for MyIMSI, length=258
<0005> gprs_llc_parse.c:78 LLC SAPI=3 C   U GEA0 IOV-UI=0x000000 FCS=0x9727ad CMD=UI DATA 
<0004> sgsn_libgtp.c:744 GTP DATA IND from GGSN for MyIMSI, length=258
<0004> sgsn_libgtp.c:629 libgtp cb_conf(type=1, cause=1, pdp=(nil), cbp=0x558cb0c66620)
<0005> gprs_llc_parse.c:78 LLC SAPI=3 C   U GEA0 IOV-UI=0x000000 FCS=0x24290e CMD=UI DATA 
<0005> gprs_llc_parse.c:78 LLC SAPI=1 C   U GEA0 IOV-UI=0x000000 FCS=0x20b16a CMD=UI DATA 
<0004> sgsn_libgtp.c:318 PDP(MyIMSI/0) Delete PDP Context
<0004> sgsn_libgtp.c:629 libgtp cb_conf(type=20, cause=128, pdp=0x7f86d15cd058, cbp=0x558cb0c6dfa0)
<0004> sgsn_libgtp.c:551 PDP(MyIMSI/0) Received DELETE PDP CTX CONF, cause=128(Request accepted)
<0006> gprs_sndcp.c:549 SNSM-DEACTIVATE.ind (lle=0x558cb0c6ad78, TLLI=efb3baff, SAPI=3, NSAPI=5)
<0005> gprs_llc_parse.c:78 LLC SAPI=1 C   U GEA0 IOV-UI=0x000000 FCS=0xcc7f58 CMD=UI DATA 
<0005> gprs_llc.c:1079 LLME(ffffffff/efb3baff){ASSIGNED} LLGM Assign pre (efb3baff => ffffffff)
<0005> gprs_llc.c:1125 LLME(00000000/00000000){UNASSIGNED} LLGM Assign post (efb3baff => ffffffff)
<0004> sgsn.c:128 Checking for inactive LLMEs, time = 1742
<0004> sgsn.c:128 Checking for inactive LLMEs, time = 1772
<0005> gprs_llc.c:552 LLME(ffffffff/afb3baff){UNASSIGNED} LLC RX: unknown TLLI 0xafb3baff, creating LLME on the fly
<0005> gprs_llc_parse.c:78 LLC SAPI=1 C   U GEA0 IOV-UI=0x000000 FCS=0xfa35a3 CMD=UI DATA 
<0005> gprs_llc.c:1079 LLME(ffffffff/afb3baff){UNASSIGNED} LLGM Assign pre (afb3baff => c183646c)
<0005> gprs_llc.c:1125 LLME(afb3baff/c183646c){ASSIGNED} LLGM Assign post (afb3baff => c183646c)
<0005> gprs_llc_parse.c:78 LLC SAPI=1 C   U GEA0 IOV-UI=0x000000 FCS=0xe51227 CMD=UI DATA 
<0000> gprs_gmm.c:114 MM(/c183646c) Stopping MM timer 3370 but 0 is running
<0005> gprs_llc_parse.c:78 LLC SAPI=1 C   U GEA0 IOV-UI=0x000000 FCS=0x59693c CMD=UI DATA 
<0000> gprs_gmm.c:114 MM(/c183646c) Stopping MM timer 3370 but 0 is running
<0005> gprs_llc_parse.c:78 LLC SAPI=1 C   U GEA0 IOV-UI=0x000000 FCS=0xea1c55 CMD=UI DATA 
<0000> gprs_gmm.c:114 MM(MyIMSI/c183646c) Stopping MM timer 3350 but 0 is running
<0005> gprs_llc.c:1079 LLME(afb3baff/c183646c){ASSIGNED} LLGM Assign pre (ffffffff => c183646c)
<0005> gprs_llc.c:1125 LLME(ffffffff/c183646c){ASSIGNED} LLGM Assign post (ffffffff => c183646c)
<0005> gprs_llc_parse.c:78 LLC SAPI=1 C   U GEA0 IOV-UI=0x000000 FCS=0x6ce262 CMD=UI DATA 
<0004> sgsn_libgtp.c:181 PDP(MyIMSI/0) Create PDP Context
<0004> sgsn_libgtp.c:629 libgtp cb_conf(type=16, cause=128, pdp=0x7f86d15cd058, cbp=0x558cb0c6dfa0)
<0004> sgsn_libgtp.c:399 PDP(MyIMSI/0) Received CREATE PDP CTX CONF, cause=128(Request accepted)
<0006> gprs_sndcp.c:526 SNSM-ACTIVATE.ind (lle=0x558cb0c6c918 TLLI=c183646c, SAPI=3, NSAPI=5)
<0004> gprs_sm.c:190 PDP(MyIMSI/0) <- ACTIVATE PDP CONTEXT ACK
<0005> gprs_llc.c:364 Sending XID type NULL (8 bytes) request to MS...
<0005> gprs_llc_parse.c:78 LLC SAPI=3 R   U GEA0 IOV-UI=0x000000 FCS=0x4e7c8c CMD=XID DATA 
<0005> gprs_llc.c:329 Received XID confirmation from MS.
<0005> gprs_llc_xid.c:268 XID: type N201_I, data_len=2, data=05df
<0005> gprs_llc_xid.c:268 XID: type N201_U, data_len=2, data=01f4
<0005> gprs_llc_xid.c:268 XID: type VERSION, data_len=1, data=00
<0005> gprs_llc.c:202 Ignoring XID-Field: XID: type N201_I, data_len=2, data=05df
<0005> gprs_llc.c:202 Ignoring XID-Field: XID: type N201_U, data_len=2, data=01f4
<0005> gprs_llc.c:202 Ignoring XID-Field: XID: type VERSION, data_len=1, data=00
<0004> sgsn.c:128 Checking for inactive LLMEs, time = 1802
<0004> sgsn.c:128 Checking for inactive LLMEs, time = 1832
<0004> sgsn_libgtp.c:629 libgtp cb_conf(type=1, cause=1, pdp=(nil), cbp=0x558cb0c66620)
<0004> sgsn.c:128 Checking for inactive LLMEs, time = 1862
<0004> sgsn.c:128 Checking for inactive LLMEs, time = 1892
<0005> gprs_llc_parse.c:78 LLC SAPI=3 C   U GEA0 IOV-UI=0x000000 FCS=0x11f9f3 CMD=UI DATA 
<0004> sgsn_libgtp.c:744 GTP DATA IND from GGSN for MyIMSI, length=112
<0004> sgsn_libgtp.c:629 libgtp cb_conf(type=1, cause=1, pdp=(nil), cbp=0x558cb0c66620)
<0005> gprs_llc_parse.c:78 LLC SAPI=3 C   U GEA0 IOV-UI=0x000000 FCS=0xe2d3a5 CMD=UI DATA 
<0004> sgsn_libgtp.c:744 GTP DATA IND from GGSN for MyIMSI, length=112
<0004> sgsn.c:128 Checking for inactive LLMEs, time = 1922
<0005> gprs_llc_parse.c:78 LLC SAPI=3 C   U GEA0 IOV-UI=0x000000 FCS=0x03dca5 CMD=UI DATA 
<0004> sgsn_libgtp.c:744 GTP DATA IND from GGSN for MyIMSI, length=112
<0005> gprs_llc_parse.c:78 LLC SAPI=3 C   U GEA0 IOV-UI=0x000000 FCS=0x813f3c CMD=UI DATA 
<0004> sgsn_libgtp.c:744 GTP DATA IND from GGSN for MyIMSI, length=112
<0004> sgsn.c:128 Checking for inactive LLMEs, time = 1952
<0005> gprs_llc_parse.c:78 LLC SAPI=1 C   U GEA0 IOV-UI=0x000000 FCS=0xee0609 CMD=UI DATA 
<0004> sgsn_libgtp.c:318 PDP(MyIMSI/0) Delete PDP Context
<0004> sgsn_libgtp.c:629 libgtp cb_conf(type=20, cause=128, pdp=0x7f86d15cd058, cbp=0x558cb0c6dfa0)