ADSL telephone line interference causes the network to drop frequently

            The network is often dropped. Many technicians think that the router is unstable. The actual situation is not the case. Sometimes, the unreasonable erection of a small link in the network will affect the stability of the network. The following is an enterprise network administrator, explaining his experience of solving network disconnection: A network company in Guangzhou, the scale is small, using an ALPHA G3 router for commercial Internet access. The company proposed that all computers on the LAN would drop five or six times per hour on average during use. So that they could not access the Internet normally, after receiving the call, I was rushing to the scene with technical support. Network structure analysis First of all, the company's network is understood, they are the 2M broadband ADSL package annual fee paid for telecommunications applications. The ADSL used is provided by Telecom when applying for broadband. The company's telephone line and network division diagram is as follows (Figure 1). The company's connection method is: the applied 2M broadband line is connected to the WAN port of the router after ADSL, and four of the four LAN ports at the lower end of the router are respectively connected. Commercial computer. After careful observation, there is no error in this connection. Figure 1 Excluding the instability of the access network Since the customer said that the average line will fall four or five times per hour, it means that there will be a dropped line every ten minutes, for this reason. I first use a computer in the LAN to enter the web interface of the router. It uses the PPPOE dial-up Internet access, the router can also dynamically obtain the DNS and IP of the telecom, and the other basic settings in the router are normal. In order to further understand the reason of the dropped line, I use the PING function: A computer simultaneously contiguous PING Telecom's DNS and router gateway. As shown (Figure 2).

Figure 2 The normal response time of PING Telecom's DNS should be around 17.5ms, and the response of the other end of the PING router should be less than or equal to 1ms. If the PING telecom response time is shorter, the ISP operator's CC switch processing power is stronger. On the contrary, the response time is too long. For example, if it is 80~100ms, the ISP operator's CC switch processing speed is not strong and is allocated to Most of the users, or the distance between the destination and the ISP operator is too long. From the above two data, the parameters of the PING package are within the standard range, so this problem can be ruled out.