China DOS Union

I can't determine the cache refresh time. If the PING time is long, it might be flushed. Also, when I said 256, it refers to the static MAC, that is, the bound one. There's no condition to test the unbound one.
1,1,20 is what I filled in during local testing and hasn't been changed back.
The calculation of non - class C masks isn't written because the subnet IP segment is part of various types of IPs, and it's still possible to PING, as long as you don't mind taking time ^_^

Attach an old batch script I wrote earlier

@ECHO OFF

set dataA=0 128 192 224 240 248 252 254 255

set ier=Input error! key:

set con=999

if not "%1" == "" (set con=1&&set go=des) else goto int

if not "%1" == "" echo %1|find ".">nul&&set go=int

goto %go%





:int

cls

if %con% equ 1 (set mask=%1&&set con=0) else set /p mask=MASK:

:chk1

SETLOCAL ENABLEDELAYEDEXPANSION

for /f "tokens=1-4 delims=." %%a in ("%mask%") do if %%a lss 128 (cls&echo %mask% %ier%1 %%a^>128&goto int) else set m_1=%%a&set m_2=%%b&set m_3=%%c&set m_4=%%d

for /f "tokens=2,3 delims==_" %%i in ('set m_') do echo %%j|findstr /v /b /e "%dataA%"&&cls&&echo %mask% %ier%2&&echo 第%%i段 %%j&&goto int

set /a _tmp1=%m_1%+%m_2%+%m_3%+%m_4%

set /a _tmp2=4

:chk2

set /a _tmp3=!m_%_tmp2%!

if not "%_tmp3%" == "0" (echo.) else set /a _tmp2=%_tmp2%-1&&goto chk2

set /a _tmp4=%_tmp1%-%_tmp3%

set /a _tmp5=%dataA:~-3%*(%_tmp2%-1)

if %_tmp4% == %_tmp5% (goto next) else echo %mask% %ier%3&goto int



:next

set /a des1=%_tmp2%*8-8

if "%_tmp3%" == "%dataA:~2,3%" set des2=1

if "%_tmp3%" == "%dataA:~6,3%" set des2=2

if "%_tmp3%" == "%dataA:~10,3%" set des2=3

if "%_tmp3%" == "%dataA:~14,3%" set des2=4

if "%_tmp3%" == "%dataA:~18,3%" set des2=5

if "%_tmp3%" == "%dataA:~22,3%" set des2=6

if "%_tmp3%" == "%dataA:~26,3%" set des2=7

if "%_tmp3%" == "%dataA:~30,3%" set des2=8

set /a des=%des1%+%des2%

echo MASK:%mask%=%des%

ENDLOCAL

goto end



:des

cls

if "%1" == "mask" set con=0

if %con% equ 1 (set mask=%1&&set con=0) else set /p mask=MASK:



:ce

echo %mask%|find "- ."&&cls&&echo %mask% %ier%1&&goto des

set /a mask1=%mask%/8

set /a mask2=%mask%%%8

set /a chk=%mask1%+%mask2%

if %chk% gtr 0 (if %chk% gtr 4 (cls&&echo %mask% %ier%2&&goto des)) else cls&&echo %mask% %ier%3&&goto des  

set s1=0&set s2=0&set s3=0&set s4=0&set s5=%mask1%

if "%mask1%" == "0" (set s0=%mask%&&goto ct) else set s0=%mask2%



:cf

set s%s5%=255

set /a s5=%s5%-1

if not "%s5%" == "0" goto cf 



:ct

if "%s0%" == "0" set s=%dataA:~0,1%

if "%s0%" == "1" set s=%dataA:~2,3%

if "%s0%" == "2" set s=%dataA:~6,3%

if "%s0%" == "3" set s=%dataA:~10,3%

if "%s0%" == "4" set s=%dataA:~14,3%

if "%s0%" == "5" set s=%dataA:~18,3%

if "%s0%" == "6" set s=%dataA:~22,3%

if "%s0%" == "7" set s=%dataA:~26,3%

if "%s0%" == "8" set s=%dataA:~30,3%

set /a _tmp=%mask1%+1

set s%_tmp%=%s%

echo %mask%=%s1%.%s2%.%s3%.%s4%



:end

pause>nul

exit

Originally posted by everest79 at 2006-12-30 10:45 PM:
Unable to determine the cache refresh time. If the PING time is long, it may be flushed. Also, when I said 256, it refers to the static MAC, that is, the bound one. There are no conditions to test the unbound one.
1,1,20 is what I filled in during local testing...

We can make the following changes:

@echo off
arp /d
FOR /L %%i IN (1,1,255) Do start /b ping 192.168.1.%%i -n 1 -w 0 >nul
arp /a | find "dynamic">IP.txt
type ip.txt
pause

Our purpose is just to refresh the local arp cache. As long as the target host is online, it will respond to the arp packet we send, and our local arp cache will be refreshed. We don't need to care about the ping packet at all, so we can set the wait time to 0.
Moreover, using start in the for loop can make ping run in parallel, which can greatly shorten the running time (with the cost of high resource usage). Since it runs very quickly, in the end, some addresses with all MACs being 0 may not have disappeared yet. At this time, using find to find the lines with "dynamic" can solve the problem.
Personally, I think this batch processing is still quite useful in the local area network.

[ Last edited by dikex on 2006-12-30 at 11:08 PM ]

Got it, this post is received, thanks a lot

If crossing VLANs, this knot won't work well

This program should automatically detect the local IP address and subnet mask, then determine the size of the local area network based on the IP address and subnet mask, and then conduct the detection, heh heh.

LAN MAC Scanning
http://www.cn-dos.net/forum/viewthread.php?tid=38988&fpage=1