def METHOD_NAME():
    "Simple ping tests"
    tgen = get_topogen()
    # Don't run this test if we have any failure.
    if tgen.routers_have_failure():
        pytest.skip(tgen.errors)
    #
    logger.info("Ping from R2 to R3")
    router = tgen.gears["R2"]
    output = router.run("ping -c 4 -w 4 {}".format("10.0.1.3"))
    assert " 0% packet loss" in output, "Ping R2->R3 FAILED"
    logger.info("Ping from R2 to R3 ... success")
    #
    logger.info("Ping from R4 to R2")
    router = tgen.gears["R4"]
    output = router.run("ping -c 4 -w 4 {}".format("10.0.0.2"))
    assert " 0% packet loss" in output, "Ping R4->R2 FAILED"
    logger.info("Ping from R4 to R2 ... success")
    #
    logger.info("Ping from R4 to R3")
    router = tgen.gears["R4"]
    output = router.run("ping -c 4 -w 4 {}".format("10.0.1.3"))
    assert " 0% packet loss" in output, "Ping R4->R3 FAILED"
    logger.info("Ping from R4 to R3 ... success")