Skip to main content

Source IP received by the server does not match SIM IP in the app

Use OpenVPN for direct access. This will allow you to identify the SIM IP.

Jakub Kubinski avatar
Written by Jakub Kubinski
Updated over a month ago


Environment

  • Onomondo app: Traffic Monitor

  • Device-to-server communication via TCP / UDP

Issue

  • Source IP on UDP datagrams does not match SIM IP.

  • I cannot identify SIM IPs via UDP packets sent to the server.

  • I am trying to enrich the data that we have in our system in a way such that we can determine the SIM card used when receiving data, but the SIM IP is not the one I see in the Onomondo app.

Solution

Use OpenVPN for direct access. This will allow you to identify the SIM IP.

Remember to enable VPN access in the Users tab.

Workaround:

  1. Add device IMEI or ICCID to the UDP / TCP payload.

  2. Get SIM information via Onomondo API.

  3. Look up IMEI or ICCID in the JSON output to map it to a SIM.

Cause

All requests from Onomondo SIMs come from one of the public Onomondo SIM subnets. This is for enhanced security, but might not be ideal if you want to identify SIMs by source IP.

Did this answer your question?