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srsran / srsRAN_Project

Open source O-RAN 5G CU/DU solution from Software Radio Systems (SRS) https://docs.srsran.com/projects/project
https://www.srsran.com
GNU Affero General Public License v3.0
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srsGNB not able to establish SCTP connection #428

Closed meenaresh19 closed 4 months ago

meenaresh19 commented 7 months ago

Issue Description

SCTP connection is timing out, COOKIE_ECHO is not reaching 5G core

Client (srsGNB) sent INIT to Core (AMF) --> Detected in pcap of both client and core Core responded with INIT_ACK(+cookie) --> Detected in pcap of both client and core Client sends COOKIE_ECHO --> Detected only in pcap of the client.

COOKIE_ECHO didnt reach AMF.

Same is tested with UERANSIM, SCTP connection is established successfully.

Setup Details

srsRAN is installed on Ubuntu 22.04 (Core i7) [Client laptop] 5G Core: Open5GS deployed on EKS cluster in AWS cloud Client laptop connected to AWS VPC using VPN (OpenVPN). Able to ping IP of AMF node from client laptop. SCTP port : 38412

Expected Behavior

SCTP connection should be successful

Actual Behaviour

SCTP connection timeout

Steps to reproduce the problem

Connect srsGNB to open5GS core in AWS EKS cluster.

Additional Information

meenaresh19 commented 7 months ago

If I connect to core in bare metal machine (separate laptop), its working fine. Not sure whats going wrong when I connect to core in AWS cloud

pgawlowicz commented 7 months ago

Can you ping the AWS host from the gNB host? Maybe you need to add a routing entry.

meenaresh19 commented 7 months ago

Able to ping. Infact SCTP INIT reached core node, and core node responded with INIT ACK. After that SRS RAN node sent COOKIE_ECHO, which is not received by 5G core node.

pgawlowicz commented 7 months ago

Do you bind the gnb to a proper IP address? here:

amf:
  addr: x.x.x.x                  # The address or hostname of the AMF.
  bind_addr: x.x.x.x
meenaresh19 commented 7 months ago

Yes, addr : AMF node IP address bind_addr : Local machine IP address where srsRAN is running

pgawlowicz commented 7 months ago

Is the bind_addr : an IP address of an interface connected to the internet?

dhiaboujebha commented 7 months ago

Is the bind_addr : an IP address of an interface connected to the internet?

Should it work, if we create a static ip address?

pgawlowicz commented 7 months ago

Could you provide the NGAP PCAP file?

pgawlowicz commented 6 months ago

@dhiaboujebha Hi, any updates on this issue?