NeoLoad doesn't provide this out-of-the-box, you need to write a piece of Javascript.

Overview of Javascript:

1. Get the value of the Upper bound
2. Generate the random number
3. Set a variable with the random number.

So, use a "JavaScript" action and use a script like:

"var maxPage = context.variableManager.getValue("maxNumberPage");
if (maxPage == null) { context.fail("Variable 'maxNumberPage' not found"); }

var minPage = 2;

// random with min and max included:
var randomPage = Math.floor((Math.random() * (maxPage - minPage + 1)) + minPage );

context.variableManager.setValue("MyRandomPage",randomPage); "