Help with GPRS and new split stack

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Rafael Diniz rafael at riseup.net
Tue Feb 27 12:30:59 UTC 2018


btw, attached goes my config, with LC15 (running everything inside ir)
IP 192.168.0.6.

Cheers,
Rafael Diniz

On 02/26/2018 11:09 PM, Rafael Diniz wrote:
> Hi Neels,
> 
> Now I have a fully working system! GPRS working!
> 
> Thanks!
> Rafael Diniz
> 
> On 02/25/2018 08:17 PM, Neels Hofmeyr wrote:
>> On Sun, Feb 25, 2018 at 12:50:54AM -0300, Rafael Diniz wrote:
>>> osmo-sgsn gives me:
>>> MM(250026920931392/e550701e) Updating authorization (unknown ->
>>> authenticate)
>>> 20180225034309988 DMM <0002> sgsn_auth.c:236
>>> MM(250026920931392/e550701e) Missing auth tuples, authorization not possible
>>> 20180225034309988 DMM <0002> sgsn_auth.c:248
>>> MM(250026920931392/e550701e) Got authorization update: state unknown ->
>>> rejected
>>> 20180225034309988 DMM <0002> gprs_gmm.c:1140
>>> MM(250026920931392/e550701e) Not authorized, rejecting ATTACH REQUEST
>>> with cause 'IMSI unknown in HLR' (2)
>>
>> Hi Rafael,
>>
>> as Vadim pointed out, you won't be able to do Authentication without the actual
>> auth tuples, which you most likely do not know for an arbitrary SIM.
>>
>> In 2G however, it is possible to connect without Authentication.  I think
>> that's done by 'auth-policy closed' and using 'ismi-acl add <your-imsi>', in
>> the osmo-sgsn.cfg under 'sgsn'. Then you're not using the HLR at all.
>>
>> In the MSC, we have added a configuration option 'authentication optional' so
>> that you can use the HLR and allow missing auth data there, but the SGSN hasn't
>> seen attention to that detail yet. There it's all or nothing, IIRC.
>>
>> Looking forward to hear your results on it...
>>
>> ~N
>>
>>
>>
> 
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