anchor.diff:  if %errorlevel% neq 0 goto :loop
   
   :configure
  -echo Configuring new TAP network device...
  +echo (Re-)configuring TAP network device...
   
   :: Give the device an IP address.
   :: 10.0.85.x is a guess which we hope will work for most users (Docker for
  
positive.code: :: Check whether the device already exists.
  netsh interface show interface name=%DEVICE_NAME% >nul
  if %errorlevel% equ 0 (
    echo %DEVICE_NAME% already exists.
    exit /b
  )
  
  :: Add the device, recording the names of devices before and after to help
  
negative.code: set BEFORE_DEVICES=%tmp%\outlineinstaller-tap-devices-before.txt
  set AFTER_DEVICES=%tmp%\outlineinstaller-tap-devices-after.txt
  
  echo Creating TAP network device...
  echo Storing current network device list...
  wmic nic where "netconnectionid is not null" get netconnectionid > "%BEFORE_DEVICES%"
  if %errorlevel% neq 0 (
  