批處理BAT更改DNS

@echo off
::判斷本地串連 賦值a
for /f "tokens=3,4 delims== " %%i in ('ipconfig ^|findstr /r "本"') do echo %%i %%j >DNS.txt

for /f "tokens=1 delims==:" %%d in (DNS.txt) do set a=%%d
::請根據實際情況更改下面三行
echo 開始更改主dns
netsh interface ip set dns name="%a%" source=static addr=219.150.32.132
echo 完成
echo 開始更改副dns
netsh interface ip add dns "%a%" 210.52.149.2 index=2
del DNS.txt
exit