25 Mar
2022
25 Mar
'22
10:44 a.m.
Hi,
I figured it out by myself😊
Regards,
/Sjur
-----Original Message-----
From: Sjur Thomas Lien <sjur.lien(a)telenormaritime.com>
Sent: Friday, March 25, 2022 10:23 AM
To: OpenBSC <openbsc(a)lists.osmocom.org>
Subject: OSMO HnbGW , problems with SCTP towards real MSC and SGSN
Hi,
I'm getting closer. But SCTP does not come up, both my real MSC and SGSN sends SCTP
ABORT:
283 2022-03-25 08:14:08.200734109 10.30.50.124 -> 10.40.33.6 SCTP 86 INIT
284 2022-03-25 08:14:08.201189770 10.40.33.6 -> 10.30.50.124 SCTP 298 INIT_ACK
285 2022-03-25 08:14:08.201286756 10.30.50.100 -> 10.40.2.66 SCTP 86 INIT
286 2022-03-25 08:14:08.201405921 10.40.2.66 -> 10.30.50.100 SCTP 60 ABORT
287 2022-03-25 08:14:08.204033135 10.30.50.124 -> 10.40.33.6 SCTP 254 COOKIE_ECHO
288 2022-03-25 08:14:08.204405432 10.40.33.7 -> 10.30.50.124 SCTP 130 HEARTBEAT
289 2022-03-25 08:14:08.204423695 10.40.33.6 -> 10.30.50.124 SCTP 64 COOKIE_ACK
290 2022-03-25 08:14:08.204595511 10.40.33.6 -> 10.30.50.124 SCTP 64 ABORT
291 2022-03-25 08:14:08.207135400 10.30.50.124 -> 10.40.33.7 SCTP 60 ABORT
SCTP endpoints:
SGSN HnbGw MSC
-------------------------------------------------------------------------------
10.40.33.6| <---------> 10.30.40.124 |10.40.2.66
10.40.33.7| 10.30.40.100 <---------> |10.40.2.74
I suspect the source port on HnbGw:
Source: 10.30.50.100
Destination: 10.40.2.66
Stream Control Transmission Protocol, Src Port: 38989 (38989), Dst Port: 2905 (2905)
Source port: 38989
Destination port: 2905
The MSC sends ABORT as answer to SCTP-INIT. But our SGSN seems to accept INIT and COOKIE,
but eventually sends ABORT.
OsmoHNBGW> show version
OsmoHNBGW 1.2.1 (OsmoHNBGW).
So a few questions:
- I tried to set local port to 2905 under asp in config file, but was rejected ( no such
command ). So is there a way to set source port ?
- In MSC and SGSN we must give local and remote port for the SCTP link. Have you tested
HnbGW with real Ericsson MSC and SGSN ?
- There are many parameters and timers connected to SCTP protocol:
HBInterval 3;
MaxAssociationRetransmits 10;
MaxInitRetransmits 3;
MaxPathRetransmits 5;
RTOInitial 3000;
RTOMax 6000;
RTOMin 1000;
ValCookieLife 60000;
Are these hardcoded, or could they be configured ?
Thanks,
/Sjur
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