Function netsim::spawn::new_namespace

pub fn new_namespace<F, R>(func: F) -> SpawnComplete<R> where
    F: FnOnce() -> R,
    F: Send + 'static,
    R: Send + 'static, 

Run the function func in its own network namespace. This namespace will not have any network interfaces. You can create virtual interfaces using Tap, or use one of the other functions in the spawn module which do this for you.