Problem with SGSN Location Update Reject during UE attach

Neels Hofmeyr nhofmeyr at sysmocom.de
Tue Oct 16 12:19:25 UTC 2018


On Tue, Oct 16, 2018 at 05:59:08PM +0700, Lam Ngoc Tuan wrote:
> We have modified the SGSN configuration: set auth-policy to accept-all.

No. For 3G, you require authentication, hence you need an external HLR that
provides auth tuples, for both MSC and SGSN.

I was unable to extract the attached rar file, please send a .tar or .tar.gz
instead, or even better, just post a link to a pastebin, so we don't fill up
people's mail inboxes.

In your first trace it seems that your authentication did work out, i.e. HLR
configured properly, but in the end the UE failed to respond with a TMSI
Reallocation Complete. That's a very weird situation, I would normally
associate that with an unreliable / unaccurate SDR based solution. But I assume
you are using a nano3G?

~N
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