From 168cd14f5124ba4427d331be8ba4655875657f36 Mon Sep 17 00:00:00 2001
From: Andrew Pimenov <pimenoffandrew@gmail.com>
Date: Sun, 9 Aug 2026 11:27:20 +0300
Subject: [PATCH] ip_geo: russian dual-stack mismatch note alongside english

---
 src/netcheck/cli.py            |  4 +++-
 src/netcheck/exporter.py       |  5 +++--
 src/netcheck/ip_geo.py         |  9 +++++++--
 tests/test_ip_geo_normalize.py | 12 ++++++++----
 4 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/src/netcheck/cli.py b/src/netcheck/cli.py
index 2906f25..f8ad7e3 100644
--- a/src/netcheck/cli.py
+++ b/src/netcheck/cli.py
@@ -136,11 +136,13 @@ async def _identity(client: httpx.AsyncClient, settings: Settings, options: Opti
             v6 = v6_merged if v6_merged.ip else None
         except (httpx.HTTPError, OSError):
             v6 = None
+    dual_stack = dual_stack_mismatch(merged, v6)
     return {
         "egress_v4": merged,
         "egress_v6": v6,
         "cf_trace": cf,
-        "dual_stack_note": dual_stack_mismatch(merged, v6),
+        "dual_stack_note": dual_stack[0] if dual_stack else None,
+        "dual_stack_note_ru": dual_stack[1] if dual_stack else None,
         "_flags": flags,
     }
 
diff --git a/src/netcheck/exporter.py b/src/netcheck/exporter.py
index 67a22d9..4af672d 100644
--- a/src/netcheck/exporter.py
+++ b/src/netcheck/exporter.py
@@ -315,8 +315,9 @@ def _connection(report: dict, lang: str = "en") -> list[str]:
         [_t(lang, "Cloudflare colo", "Дата-центр Cloudflare"), cf.get("colo") or "—"],
     ]
     lines = [title, ""] + _table([_t(lang, "Field", "Поле"), _t(lang, "Value", "Значение")], rows, lang) + [""]
-    if geo_bundle.get("dual_stack_note"):
-        lines += [f"> {geo_bundle['dual_stack_note']}", ""]
+    note = geo_bundle.get("dual_stack_note_ru" if lang == "ru" else "dual_stack_note")
+    if note:
+        lines += [f"> {note}", ""]
     return lines
 
 
diff --git a/src/netcheck/ip_geo.py b/src/netcheck/ip_geo.py
index 25faae3..edf2272 100644
--- a/src/netcheck/ip_geo.py
+++ b/src/netcheck/ip_geo.py
@@ -194,15 +194,20 @@ def merge_geo(candidates: list[tuple[str, IpGeo]]) -> IpGeo:
     return merged
 
 
-def dual_stack_mismatch(v4: IpGeo | None, v6: IpGeo | None) -> str | None:
+def dual_stack_mismatch(v4: IpGeo | None, v6: IpGeo | None) -> tuple[str, str] | None:
     if v4 is None or v6 is None or not v4.asn or not v6.asn:
         return None
     if v4.asn == v6.asn and (v4.country_code or "") == (v6.country_code or ""):
         return None
-    return (
+    en = (
         f"IPv4 egress {v4.ip} is {v4.asn} ({v4.country_code}) but IPv6 egress {v6.ip} "
         f"is {v6.asn} ({v6.country_code}); the two stacks leave through different networks."
     )
+    ru = (
+        f"Исходящий IPv4 {v4.ip} — это {v4.asn} ({v4.country_code}), а исходящий IPv6 {v6.ip} — "
+        f"{v6.asn} ({v6.country_code}); два стека выходят через разные сети."
+    )
+    return en, ru
 
 
 import asyncio
diff --git a/tests/test_ip_geo_normalize.py b/tests/test_ip_geo_normalize.py
index e355bdc..6de54d7 100644
--- a/tests/test_ip_geo_normalize.py
+++ b/tests/test_ip_geo_normalize.py
@@ -183,10 +183,14 @@ def test_merge_ignores_a_provider_that_returned_nothing():
 def test_dual_stack_mismatch_is_reported_not_resolved():
     v4 = IpGeo(ip="203.0.113.44", asn="AS64500", country_code="NL")
     v6 = IpGeo(ip="2001:db8::1", asn="AS64777", country_code="DE")
-    note = dual_stack_mismatch(v4, v6)
-    assert note is not None
-    assert "AS64500" in note
-    assert "AS64777" in note
+    pair = dual_stack_mismatch(v4, v6)
+    assert pair is not None
+    en, ru = pair
+    assert "AS64500" in en
+    assert "AS64777" in en
+    assert "AS64500" in ru
+    assert "AS64777" in ru
+    assert any(ch in ru for ch in "абвгдеёжзийклмнопрстуфхцчшщъыьэюя")
 
 
 def test_dual_stack_agreement_produces_no_note():