@echo off
ping -n 6 127.0.0.1>nul
set IPv40=127.0.0.1
set koo=1
set t=40
set ck=0

:ip_koo
if 'koo'=='4' Goto end
for /f %%i in ('ping -w 1 -n 1 -l 1 tw.yahoo.com^|find /c "Request timed out."') do (
if Not %%i==0 (
set /a koo=koo+1
echo 等待 40秒後 重試第 %koo%次
ping -n 40 127.0.0.1>nul
Goto ip_koo
)
)

cls

for /f "tokens=2 delims=:" %%i in ('ipconfig ^| find /I "IP Address"') do (
for /f "tokens=1 delims= " %%j in ("%%i") do (
set IPv41=%%j
)
)


set koo=1
if Not '%IPv40%'=='%IPv41%' (
set /a ck=ck+1
if 'ck'==2 (
set /a '%IPv41%'=='%IPv40%' 
echo %IPv41%
送出信件....
)else Goto ip_koo
)

ping -n %t% 127.0.0.1>nul

Goto ip_koo

:end
echo 網路無法連線....
pause>nul
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