diff --git a/frontend/src/NetworkMapDashboard.jsx b/frontend/src/NetworkMapDashboard.jsx
index 4a5c55b..7c243a9 100644
--- a/frontend/src/NetworkMapDashboard.jsx
+++ b/frontend/src/NetworkMapDashboard.jsx
@@ -1,6 +1,6 @@
 import { useState, useEffect, useCallback, useRef } from 'react';
 import api from './lib/api.js';
-import { IconRefresh, IconTopologyRing } from '@tabler/icons-react';
+import { IconRefresh, IconTopologyRing, IconClock } from '@tabler/icons-react';
 import PageHeader from './components/PageHeader.jsx';
 import NetworkMapUnifi from './NetworkMapUnifi.jsx';
 
@@ -70,7 +70,11 @@ export default function NetworkMapDashboard() {
   const [connections, setConnections] = useState([]);
   const [pingMap, setPingMap] = useState({});
   const [speedMap, setSpeedMap] = useState({});
+  const [pingStaleMap, setPingStaleMap] = useState({});
+  const [speedStaleMap, setSpeedStaleMap] = useState({});
   const pingTimestampsRef = useRef({});
+  const lastSuccessfulPingRef = useRef({});
+  const lastSuccessfulSpeedRef = useRef({});
   const [pingCacheSeconds, setPingCacheSeconds] = useState(0);
   const [loading, setLoading] = useState(true);
   const [pingLoading, setPingLoading] = useState(false);
@@ -140,14 +144,31 @@ export default function NetworkMapDashboard() {
         Date.now() - cache.updatedAt < cacheMaxAgeMs &&
         (Object.keys(cache.pingMap || {}).length > 0 || Object.keys(cache.speedMap || {}).length > 0);
       if (cacheValid) {
-        setPingMap(cache.pingMap || {});
-        setSpeedMap(cache.speedMap || {});
-        Object.keys(cache.pingMap || {}).forEach((k) => {
+        const cachedPingMap = cache.pingMap || {};
+        const cachedSpeedMap = cache.speedMap || {};
+        setPingMap(cachedPingMap);
+        setSpeedMap(cachedSpeedMap);
+        // Сохраняем успешные значения из кеша
+        Object.keys(cachedPingMap).forEach((k) => {
+          if (typeof cachedPingMap[k] === 'number') {
+            lastSuccessfulPingRef.current[k] = cachedPingMap[k];
+          }
           pingTimestampsRef.current[k] = cache.updatedAt;
         });
+        Object.keys(cachedSpeedMap).forEach((k) => {
+          if (cachedSpeedMap[k] && typeof cachedSpeedMap[k] === 'object') {
+            lastSuccessfulSpeedRef.current[k] = cachedSpeedMap[k];
+          }
+        });
         cacheAppliedAtRef.current = cache.updatedAt;
+        // Сбрасываем флаги устаревших данных при загрузке валидного кеша
+        setPingStaleMap({});
+        setSpeedStaleMap({});
       } else {
         setSpeedMap({});
+        // При невалидном кеше также сбрасываем флаги
+        setPingStaleMap({});
+        setSpeedStaleMap({});
       }
     } catch (e) {
       console.error('NetworkMap fetch:', e);
@@ -197,11 +218,23 @@ export default function NetworkMapDashboard() {
               count: 3,
             });
             const ms = typeof data?.avgMs === 'number' ? Math.round(data.avgMs) : null;
-            pingTimestampsRef.current[ekey] = Date.now();
-            setPingMap((prev) => ({ ...prev, [ekey]: ms }));
+            if (ms != null) {
+              pingTimestampsRef.current[ekey] = Date.now();
+              lastSuccessfulPingRef.current[ekey] = ms;
+              setPingMap((prev) => ({ ...prev, [ekey]: ms }));
+              setPingStaleMap((prev) => ({ ...prev, [ekey]: false }));
+            }
           } catch {
             pingTimestampsRef.current[ekey] = Date.now();
-            setPingMap((prev) => ({ ...prev, [ekey]: null }));
+            // При ошибке сохраняем последнее успешное значение с пометкой устаревшего
+            const lastSuccess = lastSuccessfulPingRef.current[ekey];
+            if (lastSuccess != null) {
+              setPingMap((prev) => ({ ...prev, [ekey]: lastSuccess }));
+              setPingStaleMap((prev) => ({ ...prev, [ekey]: true }));
+            } else {
+              setPingMap((prev) => ({ ...prev, [ekey]: null }));
+              setPingStaleMap((prev) => ({ ...prev, [ekey]: false }));
+            }
           }
         });
       } else if (canPingTo) {
@@ -215,11 +248,23 @@ export default function NetworkMapDashboard() {
               count: 3,
             });
             const ms = typeof data?.avgMs === 'number' ? Math.round(data.avgMs) : null;
-            pingTimestampsRef.current[ekey] = Date.now();
-            setPingMap((prev) => ({ ...prev, [ekey]: ms }));
+            if (ms != null) {
+              pingTimestampsRef.current[ekey] = Date.now();
+              lastSuccessfulPingRef.current[ekey] = ms;
+              setPingMap((prev) => ({ ...prev, [ekey]: ms }));
+              setPingStaleMap((prev) => ({ ...prev, [ekey]: false }));
+            }
           } catch {
             pingTimestampsRef.current[ekey] = Date.now();
-            setPingMap((prev) => ({ ...prev, [ekey]: null }));
+            // При ошибке сохраняем последнее успешное значение с пометкой устаревшего
+            const lastSuccess = lastSuccessfulPingRef.current[ekey];
+            if (lastSuccess != null) {
+              setPingMap((prev) => ({ ...prev, [ekey]: lastSuccess }));
+              setPingStaleMap((prev) => ({ ...prev, [ekey]: true }));
+            } else {
+              setPingMap((prev) => ({ ...prev, [ekey]: null }));
+              setPingStaleMap((prev) => ({ ...prev, [ekey]: false }));
+            }
           }
         });
       }
@@ -254,18 +299,26 @@ export default function NetworkMapDashboard() {
           { timeout: 120000 }
         );
         if (data?.ok && (data.tcpDownloadBps != null || data.tcpUploadBps != null)) {
-          setSpeedMap((prev) => ({
-            ...prev,
-            [key]: {
-              tcpDownloadBps: data.tcpDownloadBps,
-              tcpUploadBps: data.tcpUploadBps,
-              cached: data.cached === true,
-              durationSeconds: data.durationSeconds,
-            },
-          }));
+          const speedData = {
+            tcpDownloadBps: data.tcpDownloadBps,
+            tcpUploadBps: data.tcpUploadBps,
+            cached: data.cached === true,
+            durationSeconds: data.durationSeconds,
+          };
+          lastSuccessfulSpeedRef.current[key] = speedData;
+          setSpeedMap((prev) => ({ ...prev, [key]: speedData }));
+          setSpeedStaleMap((prev) => ({ ...prev, [key]: false }));
         }
       } catch {
-        setSpeedMap((prev) => ({ ...prev, [key]: null }));
+        // При ошибке сохраняем последнее успешное значение с пометкой устаревшего
+        const lastSuccess = lastSuccessfulSpeedRef.current[key];
+        if (lastSuccess != null) {
+          setSpeedMap((prev) => ({ ...prev, [key]: lastSuccess }));
+          setSpeedStaleMap((prev) => ({ ...prev, [key]: true }));
+        } else {
+          setSpeedMap((prev) => ({ ...prev, [key]: null }));
+          setSpeedStaleMap((prev) => ({ ...prev, [key]: false }));
+        }
       }
     });
     // На каждой ноде (speedTestServerId) в один момент — только один тест, чтобы не делить канал
@@ -354,6 +407,8 @@ export default function NetworkMapDashboard() {
           connections={connections}
           pingMap={pingMap}
           speedMap={speedMap}
+          pingStaleMap={pingStaleMap}
+          speedStaleMap={speedStaleMap}
         />
       )}
     </div>
diff --git a/frontend/src/NetworkMapUnifi.jsx b/frontend/src/NetworkMapUnifi.jsx
index 235871f..cda5b42 100644
--- a/frontend/src/NetworkMapUnifi.jsx
+++ b/frontend/src/NetworkMapUnifi.jsx
@@ -1,5 +1,5 @@
 import { useMemo, useCallback, useState, useRef, useEffect } from 'react';
-import { IconRefresh, IconMaximize, IconMinimize } from '@tabler/icons-react';
+import { IconRefresh, IconMaximize, IconMinimize, IconClock } from '@tabler/icons-react';
 
 const FLAG_CDN = 'https://flagcdn.com';
 
@@ -86,7 +86,7 @@ function speedKey(key1, key2) {
   return [String(key1), String(key2)].sort().join(':');
 }
 
-export default function NetworkMapUnifi({ servers = [], connections = [], pingMap = {}, speedMap = {} }) {
+export default function NetworkMapUnifi({ servers = [], connections = [], pingMap = {}, speedMap = {}, pingStaleMap = {}, speedStaleMap = {} }) {
   const containerRef = useRef(null);
   const svgRef = useRef(null);
   const [size, setSize] = useState({ w: 800, h: 520 });
@@ -209,10 +209,13 @@ export default function NetworkMapUnifi({ servers = [], connections = [], pingMa
       const to = String(c.to);
       const p1 = positions[from];
       const p2 = positions[to];
-      const ms = pingMap[edgePingKey(from, to)];
+      const ekey = edgePingKey(from, to);
+      const ms = pingMap[ekey];
+      const pingStale = pingStaleMap[ekey] === true;
       const pingLabel = typeof ms === 'number' ? `${ms} ms` : null;
       const sk = speedKey(c.fromKey, c.toKey);
       const speed = speedMap[sk];
+      const speedStale = speedStaleMap[sk] === true;
       const speedLabel =
         speed && (speed.tcpDownloadBps != null || speed.tcpUploadBps != null)
           ? formatSpeedShort(speed.tcpDownloadBps, speed.tcpUploadBps)
@@ -225,12 +228,14 @@ export default function NetworkMapUnifi({ servers = [], connections = [], pingMa
         p2,
         pingLabel,
         speedLabel,
+        pingStale,
+        speedStale,
         speed,
         tunnelType: c.tunnelType,
         raw: c,
       };
     }).filter((e) => e.p1 && e.p2);
-  }, [connections, positions, pingMap, speedMap]);
+  }, [connections, positions, pingMap, speedMap, pingStaleMap, speedStaleMap]);
 
   // Вычисляем старт/финиш и одну контрольную точку:
   // рёбра выходят из карточек под 90°, дальше сразу плавная дуга без прямых сегментов.
@@ -348,7 +353,10 @@ export default function NetworkMapUnifi({ servers = [], connections = [], pingMa
                 opacity={dimFactor}
               />
               {(() => {
-                const labels = [e.pingLabel, e.speedLabel].filter(Boolean);
+                const labels = [
+                  e.pingLabel ? { text: e.pingLabel, stale: e.pingStale } : null,
+                  e.speedLabel ? { text: e.speedLabel, stale: e.speedStale } : null,
+                ].filter(Boolean);
                 if (labels.length === 0) return null;
                 const totalH = labels.length * LABEL_H + (labels.length - 1) * LABEL_GAP;
                 const minDist = 70;
@@ -367,25 +375,49 @@ export default function NetworkMapUnifi({ servers = [], connections = [], pingMa
                 used.push({ x, y });
 
                 const pad = 8;
+                const staleColor = '#f59e0b';
                 return (
                   <g>
-                    {labels.map((text, i) => {
+                    {labels.map((label, i) => {
                       const yy = y + i * (LABEL_H + LABEL_GAP) + LABEL_H / 2;
-                      const w = Math.max(LABEL_W, Math.min(text.length * 6 + pad * 2, 160));
+                      const isStale = label.stale === true;
+                      const textWidth = label.text.length * 6;
+                      const iconWidth = isStale ? 14 : 0;
+                      const w = Math.max(LABEL_W, Math.min(textWidth + pad * 2 + iconWidth, 180));
                       const h = LABEL_H + 4;
+                      const textX = x - (iconWidth / 2);
                       return (
                         <g key={i}>
-                          <rect x={x - w / 2} y={yy - h / 2} width={w} height={h} rx={4} fill="rgba(15,23,42,0.92)" stroke={UNIFI_GREEN} strokeWidth={1} />
+                          <rect 
+                            x={x - w / 2} 
+                            y={yy - h / 2} 
+                            width={w} 
+                            height={h} 
+                            rx={4} 
+                            fill="rgba(15,23,42,0.92)" 
+                            stroke={isStale ? staleColor : UNIFI_GREEN} 
+                            strokeWidth={1}
+                            strokeDasharray={isStale ? '2,2' : 'none'}
+                          />
+                          {isStale && (
+                            <circle
+                              cx={x - w / 2 + 10}
+                              cy={yy}
+                              r={5}
+                              fill={staleColor}
+                              opacity={0.9}
+                            />
+                          )}
                           <text
-                            x={x}
+                            x={textX}
                             y={yy}
                             textAnchor="middle"
                             dominantBaseline="middle"
-                            fill={UNIFI_GREEN}
+                            fill={isStale ? staleColor : UNIFI_GREEN}
                             fontSize={i === 0 ? 12 : 11}
                             fontWeight={600}
                           >
-                            {text}
+                            {label.text}
                           </text>
                         </g>
                       );
@@ -476,9 +508,12 @@ export default function NetworkMapUnifi({ servers = [], connections = [], pingMa
       {selectedEdge && (() => {
         const fromServer = servers.find((s) => String(s.ip) === selectedEdge.from);
         const toServer = servers.find((s) => String(s.ip) === selectedEdge.to);
-        const pingMs = pingMap[edgePingKey(selectedEdge.from, selectedEdge.to)];
+        const ekey = edgePingKey(selectedEdge.from, selectedEdge.to);
+        const pingMs = pingMap[ekey];
+        const pingStale = pingStaleMap[ekey] === true;
         const sk = speedKey(selectedEdge.raw?.fromKey, selectedEdge.raw?.toKey);
         const speed = speedMap[sk] ?? selectedEdge.speed;
+        const speedStale = speedStaleMap[sk] === true;
         return (
           <div
             className="network-map-edge-modal-backdrop"
@@ -556,8 +591,14 @@ export default function NetworkMapUnifi({ servers = [], connections = [], pingMa
                   </div>
                 </div>
                 <div className="mb-3">
-                  <div className="text-muted text-uppercase mb-1" style={{ fontSize: 11 }}>
+                  <div className="text-muted text-uppercase mb-1 d-flex align-items-center" style={{ fontSize: 11 }}>
                     Пинг
+                    {pingStale && (
+                      <span className="badge bg-warning text-dark ms-2" style={{ fontSize: 9 }}>
+                        <IconClock size={10} className="me-1" />
+                        Устаревшие данные
+                      </span>
+                    )}
                   </div>
                   <div>
                     {typeof pingMs === 'number' ? `${pingMs} ms` : 'нет данных'}
@@ -565,11 +606,17 @@ export default function NetworkMapUnifi({ servers = [], connections = [], pingMa
                 </div>
                 {speed && (speed.tcpDownloadBps != null || speed.tcpUploadBps != null) && (
                   <div className="mb-1">
-                    <div className="text-muted text-uppercase mb-1" style={{ fontSize: 11 }}>
+                    <div className="text-muted text-uppercase mb-1 d-flex align-items-center" style={{ fontSize: 11 }}>
                       Скорость по туннелю
                       {speed.cached && (
                         <span className="ms-1 badge bg-secondary" style={{ fontSize: 10 }}>кеш</span>
                       )}
+                      {speedStale && (
+                        <span className="ms-1 badge bg-warning text-dark" style={{ fontSize: 9 }}>
+                          <IconClock size={10} className="me-1" />
+                          Устаревшие данные
+                        </span>
+                      )}
                     </div>
                     <div>
                       <div>