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Testing Inbound Connections using IPERF3

24 Nov 2025 • 1 min read

From your mobile (on cellular):

(You can create a file with: dd if=/dev/zero of=bigfile.bin bs=1M count=100)

If your HTTP server shows data arriving and you time the transfer, you can calculate inbound Mbps.
Or use a tool like HTTP upload benchmark apps.

👉 HTTP is easier but less precise than iperf for pure bandwidth numbers.

✅ 3) Optional: Using a VPS as the client

If your mobile carrier limits upload, or you want to stress-test your inbound line fully:

Spin up a small VPS (e.g. in the cloud)
Run iperf3 -c YOUR_PUBLIC_IP -P 4 (for parallel streams)
This can saturate your inbound WAN and give you a realistic max.

Use Ethernet or a stable connection on the home end so you measure the WAN, not Wi-Fi bottlenecks.
Some routers have built-in QoS/firewall that may throttle inbound unless you open or forward ports correctly.
To simulate real-world use, test at different times (evening vs night vs morning).
For long tests, iperf3 -t 60 gives a more stable average.

✅ Recommended for you (fast setup)