window下定時切換vpn命令

@echo off
set vpnname=xxxx   
set vpnaccount=xxx
set vpnpwd=xxx
set switchtime=60   

:loop
rasdial %vpnname% %vpnaccount% %vpnpwd%
ping -n %switchtime% 127.0.0.1>nul
rasdial %vpnname% /disconnect
goto loop