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Staging Document Editor - IP Spoofing Tab

The IP Spoofing tab of the Staging Document Editor lets multiple IP addresses on a network interface to be used when making network requests.

In a performance testing scenario, enabling IP spoofing against a system under test gives the appearance that requests are originating from many different virtual users. For some systems such as web applications, this outcome often more closely resembles "real-world" behavior.

Enable IP Spoofing

If selected, IP addresses are spoofed for all supported test steps in a test case.

Version

• IPv4: If selected, IPv4 addresses are spoofed.
• IPv6: If selected, IPv6 addresses are spoofed.

Either IPv4 or IPv6 must be selected.

Selection Algorithm

• Round Robin: Spoofed IP addresses are selected in a round-robin format.
• Random: Spoofed IP addresses are selected in a random format.

IP Spoofing Support

IP spoofing is supported only for HTTP.

You can configure the following steps to use IP spoofing:

• HTTP/HTML Request
• REST Step
• Web Service Execution (XML)
• Raw SOAP Request

IP Spoofing Scenarios

You can expect these results when IP spoofing is configured in a staging document:

A single test case with a single user with a loop:

Based on sequential or random order of the IP address list each loop in one cycle of the test gets a different IP address.

A single test case with a single user with no loop, so that test starts and ends for every cycle:

Use random addressing so that the IP address is different. If you do not select random, each user always starts with the first IP address.

A single test case with multiple users with a loop behaves as number 1:

The test exec or cycle is what maintains the list of IP addresses to use.

A single test case with multiple users with no loop must have random selected:

Selecting random ensures that a random IP address is used when the cycle starts instead of the first in the list.

Configuring IP Addresses in Windows

This section describes how to add IP addresses to a network interface for IP spoofing.

Note: Before you add IP addresses, ensure that you are an administrator.

On Windows, IP address information can be obtained by using the command-line utility ipconfig.

To add a single IP address, 192.168.0.201, use the netsh command-line utility.

netsh in ip add address "Local Area Connection" 192.168.0.201 255.255.255.0

To add many IP addresses, use netsh in a loop.

For example, the following command adds 9 more IP addresses between 192.168.0.202 and 192.168.0.210:

for /L %i in (202, 1, 210) do netsh in ip add address "Local Area Connection" 192.168.0.%i 255.255.255.0

If these commands are successful, you can verify the new IP addresses by using the command-line utility ipconfig /all.