如何用CMD命令检测电脑与局域网通或不通。
一、windows系统
按如下步骤进行，以xp系统为例（win7类似）：
1、点击屏幕左下角的“开始-运行”，在弹出的对话框中输入”cmd“，然后点确定，会弹出dos命令窗口
2、在dos命令窗口中输入：ping 192.168.0.1（这个ip替换成你的局域网路由器的ip，一般为192.168.1.1或者192.168.0.1）；如果是固定ip的话（这个是通用方法），如下图操作
看到上图中的Default Gateway 了吧，输入ping 10.139.10.1（把这个替换成你自己的）
3、如果如下显示则证明是通的：
Pinging 10.139.10.1 with 32 bytes of data:
Reply from 10.139.10.1: bytes=32 time<1ms TTL=255
Reply from 10.139.10.1: bytes=32 time=2ms TTL=255
Reply from 10.139.10.1: bytes=32 time=1ms TTL=255
Reply from 10.139.10.1: bytes=32 time=1ms TTL=255
Ping statistics for 10.139.10.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 2ms, Average = 1ms
如下显示是不通的：
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 10.139.10.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
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ping本机，如本机IP为：192.168.1.100
运行：ping 192.168.1.100
如果网卡安装配置没有问题，会显示如下内容。
Reply from 192.168.1.100 bytes=32 time<10ms
Ping statistics for 192.168.1.100
Packets Sent=4 Received=4 Lost=0 0% loss
Approximate round trip times in milli-seconds
Minimum=0ms Maximum=1ms Average=0ms
ping路由器网关，如路由器IP为192.168.1.1
运行：ping 192.168.1.1
Reply from 192.168.1.1 bytes=32 time=9ms TTL=255
Ping statistics for 192.168.1.1
Packets Sent=4 Received=4 Lost=0
Approximate round trip times in milli-seconds
Minimum=1ms Maximum=9ms Average=5ms
如果有以上内容则内网是通的，如果没有，那就不通。
ping外网IP或网站，如www.163.com
运行：ping www.163.com
Reply from 119.134.253.45 bytes=32 time=52ms TTL=54
Ping statistics for 119.134.253.45
Packets Sent=4 Received=4 Lost=0 0% loss
Approximate round trip times in milli-seconds
Minimum=52ms Maximum=171ms Average=99ms
有以上信息就表明能够正常接入互联网。反之，则表明主机文件（windows/host）存在问题
