[srslte-users] UE attach but can't create VPN

Thu Jul 9 14:22:37 UTC 2020

<div style="font-family:Arial, Helvetica, sans-serif; font-size:12px;">‌<span style="color:rgb(34, 34, 34); font-size:small">Hello,</span>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;"> </div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">I have successfully done my installation with srsLTE on one machine Ubuntu 18.04, with a LimeSDR mini. The LimeSDR mini is linked to the UE (LTE modem) with coaxial cable with -20 dB attenuation on RX side and -30 dB attenuation on TX side.</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;"> </div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">Since my UE has only one coax port, I use a splitter. </div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;"> </div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">The air conditioning next to the Lime cools it down, and the card is well connected to an USB 3 port.</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;"> </div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">I can launch srslte, and attach the UE to the network, even if the attach procedure can be fickle (see log file printed below).</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">
<div> </div>

<div>However, I want to establish a VPN connection between my UE and a VPN server, but I can't !</div>

<div>The VPN server receives the connexion request, it answers but the answer is not received by my UE. I can clearly see messages from both sides on the srslte machine, on the spgw interface, but it seems the LimeSDR doesn't send back the answer to the UE (see attached file srs_spgw_sgi.png). My UE retransmit perpetually connexion request so.</div>

<div>Sometimes for a short period of time <1s, the packets are well received by the UE and then it overlaps.</div>

<div> </div>

<div>The " [ERROR] Tx Calibration: MCU error 4 (SXT tune failed) " worried me but I don't know if it is the cause of my problems since I have seen many people having the same errors on forums.</div>

<div> </div>

<div>What can I do? All suggestions are welcome.</div>

<div> </div>

<div>Regards,</div>

<div>Théo </div>

<div> </div>

<div> </div>

<div> </div>

<div> </div>

<div>##########################  srs_spgw_sgi ##############################<wbr>#########</div>

<div> </div>

<div><img alt="srs_spgw_sgi1.jpg" class="CToWUd a6T" data-image-whitelisted="" height="122" src="https://mail.google.com/mail/u/0?ui=2&ik=e65b731b5b&attid=0.1&permmsgid=msg-a:r1955854772150472948&th=17332a50fdeef58e&view=fimg&sz=s0-l75-ft&attbid=ANGjdJ9ivDBK1YEo-rklJHD-SLJ8vW498o0EZ5hJ6R4DE-BwFZ13GxcZzZTF_70CwNfV8940Eg8G6tzZy5lD-5dj7MXmjsxQDMJ1_fjv1hS-rJtLlbjXfe51fFj4o_s&disp=emb&realattid=ii_kceidbbx0" style="cursor: pointer; outline: 0px;" tabindex="0" width="542"></div>
</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">##############################<wbr>##############################<wbr>##################</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;"> </div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;"> </div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;"> </div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">##############################<wbr>##############################<wbr>##################</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">##############################<wbr>##### enb log ##############################<wbr>######</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">##############################<wbr>##############################<wbr>##################</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">---  Software Radio Systems LTE eNodeB  ---<br>
<br>
Reading configuration file /home/user/.config/srslte/enb.<wbr>conf...<br>
<br>
Built in Release mode using commit c892ae56b on branch master.<br>
<br>
/home/user/SRS-LTE/srsLTE/<wbr>srsenb/src/enb_cfg_parser.cc.<wbr>883: Force DL EARFCN for cell PCI=1 to 6200<br>
<br>
Opening 1 channels in RF device=soapy with args=rxant=LNAH,txant=BAND2<br>
Soapy has found device #0: addr=24607:1027, driver=lime, label=LimeSDR Mini [USB 3.0] 1D538755289563, media=USB 3.0, module=FT601, name=LimeSDR Mini, serial=1D538755289563,<br>
Selecting Soapy device: 0<br>
[INFO] Make connection: 'LimeSDR Mini [USB 3.0] 1D538755289563'<br>
[INFO] Reference clock 40.00 MHz<br>
[INFO] Device name: LimeSDR-Mini<br>
[INFO] Reference: 40 MHz<br>
[INFO] LMS7002M register cache: Disabled<br>
Setting up Rx stream with 1 channel(s)<br>
Setting up Tx stream with 1 channel(s)<br>
[INFO] RX LPF configured<br>
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active<br>
[INFO] TX LPF configured<br>
Available device sensors:<br>
 - clock_locked<br>
 - lms7_temp<br>
Available sensors for Rx channel 0:<br>
 - lo_locked<br>
Setting Rx antenna to LNAH<br>
Setting Tx antenna to BAND2<br>
[ERROR] Tx Calibration: MCU error 4 (SXT tune failed)<br>
[INFO] Rx calibration finished<br>
State of gain elements for Rx channel 0 (AGC not supported):<br>
 - TIA: 9.00 dB<br>
 - LNA: 30.00 dB<br>
 - PGA: -4.00 dB<br>
State of gain elements for Tx channel 0 (AGC not supported):<br>
 - PAD: 45.00 dB<br>
 - IAMP: 0.00 dB<br>
Rx antenna set to LNAH<br>
Tx antenna set to BAND2<br>
<br>
==== eNodeB started ===<br>
Type <t> to view trace<br>
[INFO] RX LPF configured<br>
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 11.52 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active<br>
[INFO] TX LPF configured<br>
Setting frequency: DL=796.0 Mhz, UL=837.0 MHz for cc_idx=0<br>
RACH:  tti=9271, preamble=31, offset=13, temp_crnti=0x46<br>
<br>
RACH:  tti=3571, preamble=42, offset=13, temp_crnti=0x47<br>
Disconnecting rnti=0x46.<br>
User 0x47 connected<br>
LRACH:  tti=9821, preamble=27, offset=13, temp_crnti=0x48<br>
Disconnecting rnti=0x48.<br>
Disconnecting rnti=0x47.<br>
RACH:  tti=9991, preamble=15, offset=13, temp_crnti=0x49<br>
RACH:  tti=9931, preamble=20, offset=13, temp_crnti=0x4a<br>
RACH:  tti=4221, preamble=21, offset=13, temp_crnti=0x4b<br>
User 0x4b connected</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;"> </div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">##############################<wbr>##############################<wbr>##############</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">##############################<wbr>##############################<wbr>##############</div>

<div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">##############################<wbr>##############################<wbr>##############</div>
</div>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20200709/aaf04ab9/attachment.htm>