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在局域网通信连通时,诊断及维护客户端个人计算机上不了网的问题是用户最常见的问题。现在internet用户基本运用TCP/IP通信协议上网,一般来说,计算机与网络进行了物理连接与逻辑连接,就可以上网了,但经常出现网络故障上不了网,有硬件原因,也有软件问题。那么,怎么判断协议没有安装好?什么时候是网卡问题?什么情况下是线路问题?本文介绍了通过按顺序使用PING命令用排除法隔离问题进行网络维护的操作方法及使用原理,为上网用户诊断及维护网络故障提供相应的步骤。1 Ping PC机所在的网关IP 验证从本机到网关的物理线路是否连通。通却不能上网,如果不是网线正线与反线错用,肯定不是线路问题,基本上属于计算机设置问题,检查代理设置、是否与局域网内计算机使用了相同的IP地址、网卡驱动能否正常工作、IP地址的设置是否符合所在网络的要求,特别是DNS服务器的配置值等等;PING不通,有可能属于线路和计算机设置两个方面的问题。 Ping是TCP/IP环境下用于验证与其它计算机是否连通的命令。Ping命令通过发送一个工作在网络层的TCMP回显请求报文给目的主机,根据ICMP应答能够检测与目标主机的通讯是否畅通,如出现“Reply from……”字样表示可以上网了,否则表示本机到它的网关物理线路有故障。
In the LAN communication connectivity, the diagnosis and maintenance of client PCs can not get the problem of the network is the most common user problems. Internet users now basically use TCP / IP communication protocol to access the Internet, in general, the computer and the network physical connection and logical connection, you can access the Internet, but often there is no network failure on the network, there are hardware reasons, there are software problems. Then, how to determine the agreement is not installed? When is the NIC problem? Under what circumstances is the line? This article describes the order by using the PING command isolation method to isolate the problem of network maintenance methods of operation and use of principles for Internet users to diagnose And maintain the network failure to provide the appropriate steps. 1 Ping the IP address of the gateway where the PC is located Verify that the physical line from the local machine to the gateway is connected. But can not access the Internet, if it is not the main line of the network line with the wrong line, certainly not a line issue, basically belong to the computer settings, check the proxy settings, whether with the LAN computer using the same IP address, NIC driver can work , IP address settings are in line with the requirements of the network, especially DNS server configuration values and so on; PING nowhere, there may be a line and computer settings in two aspects. Ping is a command used to verify connectivity with other computers in the TCP / IP environment. The ping command sends a TCMP echo request packet at the network layer to the destination host. According to the ICMP reply, it can detect whether the communication with the destination host is smooth. If the message Reply from ... appears, The gateway to its gateway physical line is faulty.