[srslte-users] Trouble connecting commersial UE (and some basic questions..)

[Gunnar Kulbotten]

It works! I noticed that the software that came with the modem did register
to the network, and there is a AT ping function that could ping the
172.16.0.1-address successfully. The apn-settings can also  be written to
the modem. But Windows would still not register to the network. But when I
selected "Standard APN" in Windows cellular settings it works! Not sure
what this does, but before I used an APN-setting that included the srsapn.
masquerading of the wireless internet-interface also works.

tor. 23. apr. 2020 kl. 20:02 skrev Gunnar Kulbotten <gkulbotten at gmail.com>:

> The LTE modem is a Quectel  evaluation kit. I can send AT-commands to it.
> I tried to do this now, to set APN, IPv4, etc.. the unhandled nas message I
> had is now gone it seems, but the modem does not register to the
> LTE-network. I set APN in windows too, and I don`t know what is supposed to
> be set via AT-commands, and what is set in windows. If you have time to
> have a look, I enclose the epc.pcap after setting IPv4 in the modem.
> Gunnar
>
> tor. 23. apr. 2020 kl. 18:01 skrev Pedro Alvarez <
> pedro.alvarez at softwareradiosystems.com>:
>
>> It seems like your dongle is requesting IPv6 connectivity, but srsEPC
>> does not support that at the moment.
>> The UE then gets stuck sending PDN connectivity requests just for the
>> IPv6 networks.
>>
>> Can you access the APN settings in the dongle? And in the APN Protocol
>> select IPv4, instead of IPv4v6?
>>
>> On Thu, Apr 23, 2020 at 4:38 PM Gunnar Kulbotten <gkulbotten at gmail.com>
>> wrote:
>> >
>> > Thanks!
>> > Here is the epc.pcap file.
>> >
>> > tor. 23. apr. 2020 kl. 17:18 skrev Pedro Alvarez <
>> pedro.alvarez at softwareradiosystems.com>:
>> >>
>> >> Can you share the epc.pcap please?
>> >> It might still be an APN issue, it would be nice to see the actual
>> >> messages going around.
>> >>
>> >> On Thu, Apr 23, 2020 at 12:31 PM Gunnar Kulbotten <
>> gkulbotten at gmail.com> wrote:
>> >> >
>> >> > I got a small step closer to get this working today! One problem is
>> that my Quectel LTE modem won`t register to the srsLTE network. It is
>> connected to a windows-pc. The modem gets ip 172.16.0.2 from the
>> srsLTE-network. I put this address as gateway in the windows-pc network
>> properties, and 17.16.0.10 as ip-address. This actually worked for little
>> while, and I could ping the enodeb/epc-pc from the windows-pc! Then the
>> status in windows chenged to "Disconnected", and the connection was lost.
>> It reappeared for a short while, and was lost again.
>> >> >
>> >> > I got a new error message from the srsepc terminal window:
>> >> >
>> >> > UL NAS: Received Attach Complete
>> >> > Unpacked Attached Complete Message. IMSI 1012345678912
>> >> > Unpacked Activate Default EPS Bearer message. EPS Bearer id 5
>> >> > Received GTP-C PDU. Message type: GTPC_MSG_TYPE_MODIFY_BEARER_REQUEST
>> >> > Sending EMM Information
>> >> > Unhandled NAS integrity protected message
>> LIBLTE_MME_MSG_TYPE_PDN_CONNECTIVITY_REQUEST
>> >> > Unhandled NAS integrity protected message
>> LIBLTE_MME_MSG_TYPE_PDN_CONNECTIVITY_REQUEST
>> >> > Unhandled NAS integrity protected message
>> LIBLTE_MME_MSG_TYPE_PDN_CONNECTIVITY_REQUEST
>> >> > And a lot more of these...
>> >> >
>> >> > I found this information from  the thread "NAS integrity error": "
>> >> >
>> >> > Seems like the UE is initially requesting the "oai.ipv4" APN. You can
>> >> > see this in the ESM information response message in the PCAP. Only
>> >> > after the attach is complete it requests the PDN connectivity to the
>> >> > "srsapn" PDN."
>> >> >
>> >> > I thought maybe my problem was the same, but I can`t find any ESM
>> information response message
>> >> > in  my epc.pcap-file?
>> >> >
>> >> > From the beginning of epc.log:
>> >> >
>> >> > Built in Release mode using commit d045213f on branch master.
>> >> >
>> >> > ---  Software Radio Systems EPC log ---
>> >> >
>> >> > 10:18:59.364245 [HSS ] [I] Opened DB file: /etc/srslte/user_db.csv
>> >> > 10:18:59.364388 [HSS ] [I] HSS Initialized. DB file
>> /etc/srslte/user_db.csv, MCC: 61441, MNC: 65281
>> >> > 10:18:59.390979 [S1AP] [I] S1-MME Initializing
>> >> > 10:18:59.391230 [S1AP] [I] S1AP Initialized
>> >> > 10:18:59.391250 [MME GTPC] [I] Initializing MME S11 interface.
>> >> > 10:18:59.391272 [MME GTPC] [I] MME S11 Initialized
>> >> > 10:18:59.391302 [MME GTPC] [I] MME GTP-C Initialized
>> >> > 10:18:59.391313 [S1AP] [I] MME Initialized. MCC: 0xf001, MNC: 0xff01
>> >> >
>> >> > Is the MCC and MNC correct? Elsewhere they are 001 and 01?
>> >> >
>> >> > _______________________________________________
>> >> > srslte-users mailing list
>> >> > srslte-users at lists.softwareradiosystems.com
>> >> > http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>
>
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