def METHOD_NAME(self, split=False):
    self.nodes = []
    self.nodes = start_nodes(NUMB_OF_NODES, self.options.tmpdir,
        extra_args = [
            ["-logtimemicros", "-debug=net", "-debug=tls", "-debug=py"],
            ["-logtimemicros", "-debug=net", "-debug=tls", "-debug=py", "-tlsfallbacknontls=0"]
        ])
    connect_nodes_bi(self.nodes, 0, 1)
    self.is_network_split = split
    self.sync_all()