@echo off&setlocal enabledelayedexpansion
pushd %~dp0

:start
cls
Rasdial /Disconnect
Rasdial 宽带连接 xxxxx 123456
for /f "tokens=1,2 delims=:" %%a in ('ipconfig /all ^|findstr /i /c:"IP Address"') do (
    if not exist ip.txt echo %%b>ip.txt&goto :eof
    for /f "tokens=1* delims=." %%c in (ip.txt) do set aa=%%c&set bb=%%d
    for /f "tokens=1* delims=." %%i in ("%%b") do (
        if "%%i"=="!aa!" (if "%%j"=="!bb!" (goto start
           ) else (echo %%b>ip.txt&goto :eof)
        ) else (goto start)
    )
)
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