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中国DOS联盟论坛 » DOS批处理 & 脚本技术（批处理室） » Can a batch file tell whether the IP is the same? View 867　Replies 10

Original Poster Posted 2008-03-11 13:07　·　中国福建泉州电信

ka56

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When I'm online I often run into cases where ADSL changes IPs. I hope to implement a function like this: use a batch file to disconnect, reconnect, display the current IP, compare the current IP with the previous IP, and if they're the same then disconnect and redial again... until it gets a new IP

I can only do the part before that. Please give me some guidance, experts, thanks!!
rasdial /disconnect
sleep 7000
rasdial adsl 123456@adsl 123456
sleep 150
ipconfig
sleep 6000

Floor 2 Posted 2008-03-11 13:45　·　中国上海黄浦区电信

pooronce

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If you have cygwin support and bring in the sed command, it's fairly easy:



for /f "tokens=1 delims=" %%i in ('ipconfig ^| sed -n -e '/adsl/{n^;n^;n^;s/.*\: //^;p}'') do set adip=%%i

If you use only cmd commands, it's a bit more troublesome, like this:



for /f "tokens=2 delims=:" %i in ('ipconfig ^| findstr "Address" ^| findstr /v "192.168"') do @set adip=%i

192.168 is used to filter out the local IP. If you don't have a local one, you can remove it; if you have some other local IP, just add another filter for it.
This will capture one extra space before the IP address, but it doesn't affect use. Or you can remove the space too.
Of course, if you really want to capture it exactly, just slightly change it to "tokens=14 delims=: ". But this 14 may not be universal on your machine, so you'll have to confirm for yourself whether it's the 14th position.

Once the IP address is captured into a variable, the rest is just comparing it and deciding whether redialing is needed. I believe you can finish that part yourself too.

Floor 3 Posted 2008-03-11 14:10　·　中国福建泉州电信

ka56

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Originally posted by pooronce at 2008-3-11 13:45:
If you have cygwin support and bring in the sed command, it's fairly easy:
for /f "tokens=1 delims=" %%i in ('ipconfig ^| sed -n -e '/adsl/{n^;n^;n^;s/.*\: //^;p}'') do set adip=%%i

 ... 



Thanks, expert pooronce!! I'm really a newbie, I'll study it some more...

Floor 4 Posted 2008-03-11 15:26　·　中国福建泉州电信

ka56

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There are a lot of things I don't understand. Could some expert kindly write out the complete code to implement this function? I'd be extremely grateful!!

Floor 5 Posted 2008-03-11 15:35　·　中国上海黄浦区电信

pooronce

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First go to cmd and run ipconfig, let me see what it displays

Floor 6 Posted 2008-03-11 15:50　·　中国福建泉州电信

ka56

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Originally posted by pooronce at 2008-3-11 15:35:
First go to cmd and run ipconfig, let me see what it displays

Microsoft Windows XP
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Administrator>rasdial /disconnect
Command completed successfully.

Connecting to VNET_PPPOE...
Verifying username and password...
Registering your computer on the network...
Connected to VNET_PPPOE.
Command completed successfully.

C:\Documents and Settings\Administrator>ipconfig

Windows IP Configuration

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.0.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :

PPP adapter Vnet_PPPoE:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 125.78.56.190
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 125.78.56.190

Floor 7 Posted 2008-03-11 16:59　·　中国上海黄浦区电信

pooronce

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Give this a try:



@echo off

::capture old IP

for /f "tokens=2 delims=:" %%i in ('ipconfig ^| findstr "Address" ^| findstr /v "192.168"') do @set oldip=%%i

echo Your current IP address is %oldip%, confirm that you want to redial to change the IP? Enter y and press Enter to continue

set /P goon=

if not pc%goon%==pcy goto :eof



::loop starts here

:start



rasdial adsl /DISCONNECT

ping 127.0.0.1 -n 2 >nul



echo Redialing...

rasdial adsl ad4148414 pspsljljhaha

for /f "tokens=2 delims=:" %%i in ('ipconfig ^| findstr "Address" ^| findstr /v "192.168"') do @set newip=%%i

if %newip%==%oldip% (

	echo The newly dialed IP is the same as the old IP, try again!

	goto :start

	)



echo IP change successful, the current IP is:%newip%

echo Press any key to exit

set oldip=

set newip=

set goon=

pause&exit

[ Last edited by pooronce on 2008-3-11 at 05:30 PM ]

Floor 8 Posted 2008-03-11 17:16　·　中国浙江杭州中移铁通

abcd

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if not pc%goon%=pcy goto :eof
Missing =

Floor 9 Posted 2008-03-11 17:19　·　中国江苏常州电信

terse

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简单!简单!再简单!

Floor 10 Posted 2008-03-11 17:29　·　中国上海黄浦区电信

pooronce

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Originally posted by abcd at 2008-3-11 05:16 PM:
if not pc%goon%=pcy goto :eof
Missing =

Oh,
didn't notice it~

[ Last edited by pooronce on 2008-3-11 at 05:31 PM ]

Floor 11 Posted 2008-03-11 17:34　·　中国福建泉州电信

ka56

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Originally posted by terse at 2008-3-11 17:19:
@echo off
for /f "tokens=2 delims=:" %%i in ('ipconfig /all^|find /i "Address"') do set ip1=%%i
:aaa
rasdial /disconnect&&rasdial adsl 123456@adsl 123456
for /f &quo ...

Thanks, experts, it's already working!!!! :))
Thanks pooronce!!! Thanks to the brothers who replied, to the friends above who helped me, if you like QQ numbers, I'll give away a QQ one...
Added a delay, here is the final code:
@echo off
for /f "tokens=2 delims=:" %%i in ('ipconfig /all^|find /i "Address"') do set ip1=%%i
echo Current IP %ip1%
:aaa
rasdial /disconnect
sleep 5000
rasdial adsl 123456@qzadsl 123456
for /f "tokens=2 delims=:" %%i in ('ipconfig /all^|find /i "Address"') do set ip2=%%i
echo IP after redial %ip2%
if "%ip1%"=="%ip2%" goto aaa
pause

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