How do I know what IP addressed are used in a load test so they can be white listed

Anonymous
2026-04-24T19:49:41.3966667+00:00

I have 273 engines defined for my load test. The organization requires that only white list IP addresses can access the test environment.

I see where I can define the whitelist but no the IP addresses,

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  1. kagiyama yutaka 5,330 Reputation points
    2026-04-25T08:53:57.2333333+00:00

    I think all load‑engine traffic just exits through the NAT gateway IP, so that’s the only one you whitelist.

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  2. AI answer

    2026-04-24T19:49:52.68+00:00

    Azure Load Testing uses the public IP addresses assigned to the outbound path from the injected load test engine subnet.

    For a scenario where a public endpoint has access restrictions and must allow only specific client IPs:

    1. Deploy a NAT Gateway in the same virtual network and attach it to the subnet where the Azure Load Testing engines are injected.
    2. Configure the NAT Gateway with one or more public IP addresses or a public IP prefix.
    3. These configured public IP addresses are the ones used by the load test engine VMs for outbound traffic.
    4. Provide these NAT Gateway public IP addresses to the security team so they can be allowlisted on the test environment.

    This way, regardless of how many engines (for example, 273) are used, all outbound traffic from the engines will appear to come from the NAT Gateway’s public IPs, which can be safely added to the whitelist.

    References:

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