用命令提示符查看网络连接状态

在cmd下
ping (输入IP地址) 回车
之后出四行英语，如果带TTL=数字，正明你的网络是通的
如出现
Request timed out，证明不通，但也有别的比如找不到主机什么，都不是不通的，带TTL=带数字的，就是通的，例子：
开始-运行-cmd
ping 192.168.1.254
Pinging 192.168.1.254 with 32 bytes of data:

Reply from 192.168.1.254: bytes=32 time=1ms TTL=64
Reply from 192.168.1.254: bytes=32 time=1ms TTL=64
Reply from 192.168.1.254: bytes=32 time=1ms TTL=64
Reply from 192.168.1.254: bytes=32 time=1ms TTL=64

Ping statistics for 192.168.1.254:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 1ms, Average = 1ms

这是通的
ping 1.1.1.1( 我蒙的地址一定是不通的)
Pinging 1.1.1.1 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

statistics for 1.1.1.1:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
不通

开始 运行
cmd
ipconfig /all 显示当前网络配置（查看本机网卡IP 掩码DNS 网关）
ping 路由网关地址192.168.X（根据个人网路而定）.1
ping路由通只表示局域网内是好的
ping当地宽带运营商的DNS 致电10000/10060即可询问
ping当地dns不丢包100%receive（返回），0%loss（丢失）说明网络是通的

ping 192.168.0.1 -t

意思就是 不停的象陆游发送包

陆游也会给你返回一个包！

看它返回的包就可以看出来了

如ping baidu 运行或者cmd下都可以
ping www.baidu.com -t