diff --git a/tests/integration/test_statistics_remaining_writes.py b/tests/integration/test_statistics_remaining_writes.py
new file mode 100644
index 0000000..72949ec
--- /dev/null
+++ b/tests/integration/test_statistics_remaining_writes.py
@@ -0,0 +1,129 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from __future__ import annotations
+
+import os
+from collections.abc import Mapping
+from typing import Any
+
+import pytest
+
+from nr2301 import NR2301Client
+
+
+if os.environ.get("NR2301_WRITE_INTEGRATION") != "1":
+    pytest.skip(
+        "physical statistics write tests require NR2301_WRITE_INTEGRATION=1",
+        allow_module_level=True,
+    )
+
+
+pytestmark = pytest.mark.integration
+
+
+@pytest.fixture(scope="module")
+def router():
+    password = os.environ.get("NR2301_PASSWORD")
+    if not password:
+        pytest.skip("NR2301_PASSWORD is required for physical-router integration tests")
+
+    with NR2301Client(
+        os.environ.get("NR2301_URL", "http://zyxel.home"),
+        username=os.environ.get("NR2301_USERNAME", "admin"),
+        password=password,
+        timeout=10.0,
+    ) as client:
+        client.login()
+        yield client
+
+
+def _mapping(value: Any, label: str) -> Mapping[str, Any]:
+    if not isinstance(value, Mapping):
+        pytest.fail(f"{label} did not return an object")
+    return value
+
+
+def _mode(router) -> str:
+    response = _mapping(router.statistics.filter_mode(timeout=10.0), "filter mode")
+    value = response.get("mode")
+    if value not in {"black", "white"}:
+        pytest.fail(f"unsupported filter mode {value!r}")
+    return str(value)
+
+
+def _traffic_totals(router) -> tuple[int, ...]:
+    response = _mapping(router.statistics.traffic(timeout=10.0), "traffic")
+    stats = _mapping(response.get("statistics"), "traffic.statistics")
+    names = (
+        "total_duration",
+        "total_rx_bytes",
+        "total_tx_bytes",
+        "total_rx_tx_bytes",
+        "total_error_bytes",
+    )
+    values: list[int] = []
+    for name in names:
+        value = stats.get(name)
+        if isinstance(value, bool) or not isinstance(value, int):
+            pytest.fail(f"traffic.statistics.{name} was not an integer")
+        if value < 0:
+            pytest.fail(f"traffic.statistics.{name} was negative")
+        values.append(value)
+    return tuple(values)
+
+
+def test_filter_mode_same_state_write_and_readback(router):
+    original = _mode(router)
+
+    response = _mapping(
+        router.statistics.set_filter_mode(original, timeout=10.0),
+        "statistics/set_black_white_mode",
+    )
+    if "result" in response:
+        value = response["result"]
+        if isinstance(value, bool) or not isinstance(value, int):
+            pytest.fail("statistics/set_black_white_mode.result was not an integer")
+
+    assert _mode(router) == original
+
+    print(
+        "STAT_FILTER_MODE_WRITE"
+        f" mode={original}"
+        " same_state=True"
+        " readback=True",
+        flush=True,
+    )
+
+
+def test_clear_traffic_counters_action(router):
+    before = _traffic_totals(router)
+    before_sum = sum(before)
+    before_nonzero = any(value > 0 for value in before)
+
+    response = _mapping(
+        router.statistics.clear_traffic(timeout=10.0),
+        "statistics/stat_clear_common_data",
+    )
+    statistics = _mapping(
+        response.get("statistics"),
+        "statistics/stat_clear_common_data.statistics",
+    )
+    assert statistics.get("setting_response") == "OK"
+
+    after = _traffic_totals(router)
+    after_sum = sum(after)
+
+    # The router can immediately accumulate a small amount of new traffic
+    # while we perform the verification GET. If historical counters existed,
+    # a successful clear should nevertheless reduce the aggregate total.
+    if before_sum > 0:
+        assert after_sum < before_sum
+
+    print(
+        "STAT_TRAFFIC_CLEAR"
+        " setting_response=OK"
+        f" before_nonzero={before_nonzero}"
+        f" reset_effect_observed={before_sum > 0 and after_sum < before_sum}"
+        " raw_counter_values_logged=False",
+        flush=True,
+    )