【bat】バッチファイルでネットワーク接続を継続監視して自動復旧する完全ガイド｜ping多点確認・netsh再接続・Wi-Fi・ドライブ再マウント・ログ記録まで

@echo off
setlocal

set TARGET=8.8.8.8
set LOGFILE=C:\logs\net_monitor.log
set INTERVAL=60
if not exist "C:\logs" mkdir "C:\logs"

call :log "===== 監視開始 ターゲット: %TARGET% ====="

:LOOP
REM ping -n 3: 3回送信して1回でも "TTL=" が返れば接続OK
ping -n 3 %TARGET% | findstr "TTL=" >nul 2>&1
if %ERRORLEVEL% equ 0 (
    call :log "[OK] %TARGET% 疎通確認"
) else (
    call :log "[NG] %TARGET% 応答なし"
)
timeout /t %INTERVAL% /nobreak >nul
goto LOOP

:log
set T=%TIME: =0%
echo [%DATE% %T:~0,8%] %~1 >> "%LOGFILE%"
echo [%DATE% %T:~0,8%] %~1
goto :eof

@echo off
setlocal enabledelayedexpansion

REM 監視ターゲット（独立した複数のサーバーを使う）
set T1=8.8.8.8
set T2=1.1.1.1
set T3=208.67.222.222
set LOGFILE=C:\logs\net_multi.log
set INTERVAL=60
if not exist "C:\logs" mkdir "C:\logs"

:MULTI_LOOP
set FAIL=0

REM 各ターゲットへ ping
for %%T in (%T1% %T2% %T3%) do (
    ping -n 2 %%T | findstr "TTL=" >nul 2>&1
    if !ERRORLEVEL! neq 0 set /a FAIL+=1
)

set T=%TIME: =0%
set TS=%DATE% %T:~0,8%

if %FAIL% geq 2 (
    REM 3件中2件以上失敗 → 接続異常と判断
    echo [%TS%] [NG] ネットワーク異常検知 (失敗 %FAIL%/3) >> "%LOGFILE%"
    call :reconnect
) else if %FAIL% equ 1 (
    echo [%TS%] [WARN] 部分的な到達不能 (失敗 %FAIL%/3) >> "%LOGFILE%"
) else (
    echo [%TS%] [OK] 全ターゲット疎通OK >> "%LOGFILE%"
)

timeout /t %INTERVAL% /nobreak >nul
goto MULTI_LOOP

:reconnect
echo [%TS%] 再接続処理を開始します >> "%LOGFILE%"
goto :eof

:log
set T=%TIME: =0%
echo [%DATE% %T:~0,8%] %~1 >> "%LOGFILE%"
echo [%DATE% %T:~0,8%] %~1
goto :eof

@echo off
setlocal

REM アダプター名確認: netsh interface show interface で一覧表示
REM よくある名前: "イーサネット" "Wi-Fi" "ローカル エリア接続"
set ADAPTER=イーサネット

call :reconnect_adapter
goto :eof

:reconnect_adapter
set T=%TIME: =0%
echo [%DATE% %T:~0,8%] [INFO] %ADAPTER% を再起動します

REM アダプターを無効化
netsh interface set interface "%ADAPTER%" admin=disable
if %ERRORLEVEL% neq 0 (
    echo [ERROR] アダプター無効化失敗 管理者権限で実行してください
    exit /b 1
)
timeout /t 5 /nobreak >nul

REM アダプターを有効化
netsh interface set interface "%ADAPTER%" admin=enable
timeout /t 10 /nobreak >nul

echo [%DATE% %T:~0,8%] [INFO] %ADAPTER% 再起動完了
goto :eof

@echo off
setlocal enabledelayedexpansion

REM 接続済みアダプター名を一覧表示
echo === 接続済みアダプター一覧 ===
netsh interface show interface | findstr "接続済み"
echo.

REM 接続済みの最初のアダプター名を取得
set ADAPTER=
for /f "tokens=4*" %%A in ('netsh interface show interface ^| findstr "接続済み"') do (
    if not defined ADAPTER set ADAPTER=%%A %%B
)
REM 末尾の余分なスペースを除去
for /f "tokens=* delims= " %%A in ("%ADAPTER%") do set ADAPTER=%%A

echo 対象アダプター: [%ADAPTER%]

netsh interface set interface "%ADAPTER%" admin=disable
timeout /t 5 /nobreak >nul
netsh interface set interface "%ADAPTER%" admin=enable
echo 再起動完了: %ADAPTER%

@echo off
setlocal

set WIFI_ADAPTER=Wi-Fi
set SSID=MyWiFiNetwork
set LOGFILE=C:\logs\wifi_monitor.log
if not exist "C:\logs" mkdir "C:\logs"

:WIFI_LOOP
ping -n 3 8.8.8.8 | findstr "TTL=" >nul 2>&1
if %ERRORLEVEL% equ 0 goto WIFI_OK

REM --- Wi-Fi 異常検知 ---
set T=%TIME: =0%
echo [%DATE% %T:~0,8%] [NG] Wi-Fi 切断検知 >> "%LOGFILE%"

REM アダプター再起動
netsh interface set interface "%WIFI_ADAPTER%" admin=disable
timeout /t 5 /nobreak >nul
netsh interface set interface "%WIFI_ADAPTER%" admin=enable
timeout /t 10 /nobreak >nul

REM SSID へ再接続
netsh wlan connect name="%SSID%"
echo [%DATE% %T:~0,8%] [INFO] SSID "%SSID%" へ再接続要求 >> "%LOGFILE%"

REM 再接続確認（最大30秒待機）
set WAIT=0
:WIFI_CHECK
timeout /t 5 /nobreak >nul
set /a WAIT+=5
ping -n 1 8.8.8.8 | findstr "TTL=" >nul 2>&1
if %ERRORLEVEL% equ 0 (
    echo [%DATE% %T:~0,8%] [OK] Wi-Fi 復旧 (待機: %WAIT%秒) >> "%LOGFILE%"
    goto WIFI_OK
)
if %WAIT% lss 30 goto WIFI_CHECK
echo [%DATE% %T:~0,8%] [WARN] Wi-Fi 復旧確認タイムアウト >> "%LOGFILE%"

:WIFI_OK
timeout /t 60 /nobreak >nul
goto WIFI_LOOP

@echo off
setlocal enabledelayedexpansion

REM 監視するドライブ・共有パス・認証情報の設定
set DRIVE=Z:
set UNC=\\server\share
set NET_USER=domain\username
set NET_PASS=password
set LOGFILE=C:\logs\drive_monitor.log
if not exist "C:\logs" mkdir "C:\logs"

:DRIVE_LOOP
REM ドライブの接続状態を確認
net use %DRIVE% >nul 2>&1
if %ERRORLEVEL% equ 0 (
    REM 実際にアクセスできるか確認（キャッシュ済みでも切れている場合がある）
    dir %DRIVE% >nul 2>&1
    if !ERRORLEVEL! equ 0 (
        call :log "[OK] %DRIVE% マウント済み・アクセス可"
        goto DRIVE_WAIT
    )
)

REM --- 切断・アクセス不可 → 再マウント ---
call :log "[NG] %DRIVE% 切断検知 再マウントします"

REM 既存の接続を削除してから再接続
net use %DRIVE% /delete >nul 2>&1
net use %DRIVE% %UNC% /user:%NET_USER% %NET_PASS% /persistent:no

if %ERRORLEVEL% equ 0 (
    call :log "[OK] %DRIVE% 再マウント成功: %UNC%"
) else (
    call :log "[NG] %DRIVE% 再マウント失敗 ERRORLEVEL=%ERRORLEVEL%"
)

:DRIVE_WAIT
timeout /t 120 /nobreak >nul
goto DRIVE_LOOP

:log
set T=%TIME: =0%
echo [%DATE% %T:~0,8%] %~1 >> "%LOGFILE%"
echo [%DATE% %T:~0,8%] %~1
goto :eof

@echo off
setlocal enabledelayedexpansion

REM ===== 設定 =====
set ADAPTER=イーサネット
set DRIVE=Z:
set UNC=\\server\share
set PING1=8.8.8.8
set PING2=1.1.1.1
set INTERVAL=60
set MAX_RECONNECT=5

REM ログファイル（日付付き）
for /f "tokens=2 delims==" %%A in ('wmic os get LocalDateTime /value') do set DT=%%A
set LOGFILE=C:\logs\net_%DT:~0,8%.log
if not exist "C:\logs" mkdir "C:\logs"

set RECONNECT_COUNT=0
call :log "===== ネットワーク監視開始 ====="

:MAIN_LOOP
REM --- 多点 ping チェック ---
set FAIL=0
ping -n 2 %PING1% | findstr "TTL=" >nul 2>&1
if !ERRORLEVEL! neq 0 set /a FAIL+=1
ping -n 2 %PING2% | findstr "TTL=" >nul 2>&1
if !ERRORLEVEL! neq 0 set /a FAIL+=1

if %FAIL% lss 2 (
    call :log "[OK] ネットワーク正常"
    set RECONNECT_COUNT=0
    goto CHECK_DRIVE
)

REM --- 接続異常 ---
set /a RECONNECT_COUNT+=1
call :log "[NG] 接続異常検知 (累計再接続: !RECONNECT_COUNT!/%MAX_RECONNECT%)"

if !RECONNECT_COUNT! gtr %MAX_RECONNECT% (
    call :log "[ABORT] 再接続上限到達 監視を停止します"
    exit /b 1
)

REM --- アダプター再起動 ---
netsh interface set interface "%ADAPTER%" admin=disable
timeout /t 5 /nobreak >nul
netsh interface set interface "%ADAPTER%" admin=enable
call :log "[INFO] アダプター %ADAPTER% 再起動"

REM --- 疎通回復確認（最大60秒）---
set WAIT=0
:RECOVERY_CHECK
timeout /t 5 /nobreak >nul
set /a WAIT+=5
ping -n 1 %PING1% | findstr "TTL=" >nul 2>&1
if %ERRORLEVEL% equ 0 (
    call :log "[OK] 疎通回復確認 (待機: %WAIT%秒)"
    goto CHECK_DRIVE
)
if %WAIT% lss 60 goto RECOVERY_CHECK
call :log "[WARN] 疎通回復確認タイムアウト"

:CHECK_DRIVE
REM --- ドライブ確認・再マウント ---
dir %DRIVE% >nul 2>&1
if %ERRORLEVEL% neq 0 (
    net use %DRIVE% /delete >nul 2>&1
    net use %DRIVE% %UNC% /persistent:no
    if !ERRORLEVEL! equ 0 (
        call :log "[OK] %DRIVE% 再マウント成功"
    ) else (
        call :log "[NG] %DRIVE% 再マウント失敗"
    )
)

timeout /t %INTERVAL% /nobreak >nul
goto MAIN_LOOP

:log
set T=%TIME: =0%
echo [%DATE% %T:~0,8%] %~1 >> "%LOGFILE%"
echo [%DATE% %T:~0,8%] %~1
goto :eof