::设置本机临时IP
netsh interface ip set address name="本地连接" source=static addr=10.21.3.254 mask=255.255.255.0 gateway=10.21.3.1 gwmetric=1 >nul
::根据本机IP扫描已占用IP，生成ip.txt（必须成功连入LAN，否则出错）
for /f "tokens=2 delims=:" %%i in ('ipconfig /all^|findstr /c:"IP Address"') do set "oldip=%%i"
for /f "tokens=2 delims=:" %%a in ('ipconfig /all^|findstr /c:"Default Gateway"') do (
   set "wg=%%a"
   for /f "tokens=1-3 delims=. " %%i in ("%%a") do (
       set "wd=%%i.%%j.%%k."
       for /l %%m in (1,1,255) do start /min ping /n 1 %%i.%%j.%%k.%%m
   )
)
arp -a|findstr "dynamic">ip.txt

::自动更换未占用的第一个IP地址
for /l %%i in (1,1,255) do (
    set "ip=%%i"
    if "%wd%%%i" neq "%wg:~1%" findstr "\<%wd%%%i\>" ip.txt>nul||goto next
)
:next
netsh interface ip set address "本地连接" static %wd%%ip% %mask% %wg:~1% 1 >nul
echo.
echo 配置后ip为%wd%%ip%
echo.
echo 完成配置，请按任意键退出。
pause>nul
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