如果网络不通，可以按照以下步骤来诊断网络状况：依次点击:开始-允许-输入CMD，进入DOS窗口后用ping命令来诊断网络连接的状况。
ping是Windows系列自带的一个可执行命令。利用它可以检查网络是否能够连通，用好它可以很好地帮助我们分析判定网络故障。应用格式：“Ping IP地址”。该命令还可以加许多参数使用，具体是键入Ping按回车即可看到详细说明。
1.Ping本机IP
例如本机IP地址为：222.31.191.211。则执行命令Ping 222.31.191.211。如果网卡安装配置没有问题，则应有类似下列显示：
C:\>ping 222.31.191.211
Pinging 222.31.191.211 with 32 bytes of data:
Reply from 222.31.191.211: bytes="32" time<1ms TTL="128
Reply from 222.31.191.211: bytes="32" time<1ms TTL="128
Reply from 222.31.191.211: bytes="32" time<1ms TTL="128
Reply from 222.31.191.211: bytes="32" time<1ms TTL="128
Ping statistics for 222.31.191.211:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
如果在MS-DOS方式下执行此命令显示内容为：Request timed out，则表明网卡安装或配置有问题。将网线断开再次执行此命令，如果显示正常，则说明本机使用的IP地址可能与另一台正在使用的机器IP地址重复了。如果仍然不正常，则表明本机网卡安装或配置有问题，需继续检查相关网络配置。
2.Ping网关IP
假定网关IP为：222.31.191.110，则执行命令“Ping 222.31.191.110”。在MS-DOS方式下执行此命令，如果显示类似以下信息：
Pinging 222.31.191.110 with 32 bytes of data:
Reply from 222.31.191.110: bytes="32" time<1ms TTL="255
Reply from 222.31.191.110: bytes="32" time<1ms TTL="255
Reply from 222.31.191.110: bytes="32" time<1ms TTL="255
Reply from 222.31.191.110: bytes="32" time<1ms TTL="255
Ping statistics for 222.31.191.110:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
则表明局域网中的网关路由器正在正常运行。反之，则说明网关设置有问题，请检查IP，网关等信息是否设置正确。
3.Ping远程IP
这一命令可以检测本机能否正常访问Internet。比如林大主页的IP地址为：202.204.112.68。在MS-DOS方式下执行命令：“Ping 202.204.112.68”，如果屏幕显示：
Pinging 202.204.112.68 with 32 bytes of data:
Reply from 202.204.112.68: bytes="32" time<1ms TTL="63
Reply from 202.204.112.68: bytes="32" time<1ms TTL="63
Reply from 202.204.112.68: bytes="32" time<1ms TTL="63
Reply from 202.204.112.68: bytes="32" time<1ms TTL="63
Ping statistics for 202.204.112.68:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
则表明运行正常，能够正常接入校园网。反之，则表明网络设置存在问题或IP绑定不正确。
4.Ping DNS IP
这一命令用于检查校园网的DNS是否工作正常，如果您可以正常联网，但是输入域名却无法解析时请尝试该命令“ping 202.204.112.66”，如果显示
Pinging 202.204.112.66 with 32 bytes of data:
Reply from 202.204.112.66: bytes="32" time<1ms TTL="63
Reply from 202.204.112.66: bytes="32" time<1ms TTL="63
Reply from 202.204.112.66: bytes="32" time<1ms TTL="63
Reply from 202.204.112.66: bytes="32" time<1ms TTL="63
Ping statistics for 202.204.112.66:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
则表明DNS服务器工作正常，如果显示“Request timed out.”请马上联系信息中心。