@echo off
chcp 437>nul
netsh int ip show subinterfaces
set /p ip=ipaddress:
if "%ip%"=="" (set ip=qq.com)
if %ip%.==. goto:eof
echo.

set con=
for /f "tokens=1 delims= " %%a in ('ping %ip% -n 1 ^| find "Reply"') do set con=%%a
if %con%.==. goto:discon

set min=0
set max=2000

:test
call:try %min% %max%
if %df%.==. (
    if %min%==%package% goto:result
    set min=%package%
) else (
    set max=%package%
) 
goto:test
goto:eof

:result
echo.
echo package: %package%
set /a mtu=%package% + 28
echo MTU : %mtu%
echo.
pause
goto:eof

:try
set /a package=(%1+%2)/2
echo try : %package% [%1 , %2]
call:ping %package%
goto:eof

goto:eof
:ping
set df=
for /f "tokens=1 delims= " %%a in ('ping %ip% -f -l %1 -n 1 ^| find "DF"') do set df=%%a
goto:eof

:discon
echo Error: can not connect to %ip%
echo.
pause
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@echo off
chcp 936 >nul
set "ip=127.0.0.1"
set "con="
for /f %%a in ('ping %ip% -n 1 ^| find "回复"') do (
    set "con=%%a"
)
echo con的值是：%con%
pause
复制代码