局域网内怎么防止对方对我进行MAC扫描？

在防火墙里设置禁止ping入就可以了 设置方法举例: 瑞星防火墙 设置详细设置规则设置IP规则把 禁止ping入 前打上勾，点应用，确定就可以了。 其他防火墙在设置里大都有禁止ping入的设置，找一下就会找到的

怎样用ping扫描局域网?

Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS]
[-r count] [-s count] [[-j host-list] | [-k host-list]]
[-w timeout] target_name

Options:
-t Ping the specified host until stopped.
To see statistics and continue - type Control-Break;
To stop - type Control-C.
-a Resolve addresses to hostnames.
-n count Number of echo requests to send.
-l size Send buffer size.
-f Set Don't Fragment flag in packet.
-i TTL Time To Live.
-v TOS Type Of Service.
-r count Record route for count hops.
-s count Timestamp for count hops.
-j host-list Loose source route along host-list.
-k host-list Strict source route along host-list.
-w timeout Timeout in milliseconds to wait for each reply.

局域网扫描

你把下面内容复制在记事本然后另存为1.BAT文件 后运行 就可以扫描局域网任意网段

@echo off
echo.
echo --------------活动主机扫描-----------------------
echo 功能说明：
echo 1、扫描本网段的活动主机；
echo 2、扫描随机网段的活动主机；
echo 3、保存扫描结果；
echo.

echo -------------------------------------------------

:start
echo 1、扫描本网段；
echo 2、扫描任意网段；
echo q、退出(区分大小写)
set goto=
set /p goto=请输入你的选择：
if %goto%==q goto :exit
if %goto%==1 (goto :self) else goto :any

:self
for /f usebackq delims=: tokens=2 %%i in (`ipconfig|find IP Address `) do set ipaddr=%%i
for /f delims=. tokens=1,2,3,4* %%i in (%ipaddr%) do set /a ipaddr1=%%i &&set /a ipaddr2=%%j && set /a ipaddr3=%%k && set /a ipaddr4=%%l
goto :scan

:any
set ipaddr1=%random%
set /a (ipaddr1%%=256)
set ipaddr2=%random%
set /a (ipaddr2%%=256)
set ipaddr3=%random%
set /a (ipaddr3%%=256)
goto :scan

:scan
set /a count=0
echo.>scan_result.txt
echo ---------%ipaddr1%.%ipaddr2%.%ipaddr3%段活动主机(WinNT)------->>scan_result.txt
for /l %%i in (1,1,256) do echo 正在扫描 %ipaddr1%.%ipaddr2%.%ipaddr3%.%%i &&echo 请等待........&& ping -n 1 -w 2 %ipaddr1%.%ipaddr2%.%ipaddr3%.%%i|find TTL=128>nul &&set /a count=%count%+1 && echo %ipaddr1%.%ipaddr2%.%ipaddr3%.%%i>>scan_result.txt
cls
echo ----------------结果说明---------------
echo 扫描完毕!
echo 共扫描到活动的Windows NT系统：%count%台。
echo 扫描的结果保存在当前目录的scan_result.txt中。
echo -----------------------------------
echo 1、继续扫描其它网段；
echo q、退出
set goto=
set /p goto=请输入你的选择：
if %goto%==q (goto :start) else goto :any
:exit