No longer wait for five steps to get your network speed up to the next level

No matter what type of network, some faults will inevitably occur. After the establishment of a LAN, learning to diagnose network faults is one of the important "Lessons" that network administrators must practice.
Generally, when a local area network fails to access a Web page or cannot log on to a server, the failure is often very obvious, network administrators can easily observe such faults and locate specific fault points. Therefore, solving such connectivity faults is not that difficult. However, what makes network administrators feel a headache is that the lan network is clearly connected, but the network transmission speed is very slow. In the face of such "soft" network faults, many network managers tend to be scratching their heads and do not know where to start to solve the problem of slow network transmission speed. To this end, this article will start from some unnoticeable details to find a way to increase the network transmission speed!

Starting from the network loop to speed up the network

Generally, when the lan network is small, the number of nodes contained in the network is not too large, and the network structure is not too complex, the network loop will rarely happen in the LAN. However, in LAN environments with relatively complex networking structures, some spare connection cables often exist. If we accidentally connect the cables to the network, it is easy to have a network loop. For example, the network cable is connected to room A from the unit data center, and then to Room B from Room A. At the same time, A backup network cable is directly connected to Room B from the unit data center, if these cables are connected at the same time, network loops will occur in the LAN, data packets will be continuously sent to the LAN, and the LAN will constantly verify data information, in this way, the data transmission speed of the LAN network will be significantly affected. It is relatively difficult to find the cause of the fault.

In order to avoid the slow speed caused by network loops as much as possible, we must develop good habits when laying network connection cables, it is necessary to promptly record and mark the standby Network cables, and add obvious labels to the network cables. If we suspect that there is a loop in the LAN, we can take the segmentation and partitioning methods for troubleshooting in sequence, so that we can quickly find the cause of the fault and eliminate the network loop phenomenon in a timely manner. To speed up network transmission.

Speed up the network based on port bottlenecks

We know that server NICs, switch ports, router LAN ports, WAN ports, and hub ports may all become the data transmission bottlenecks in the LAN. Once a network bottleneck occurs, the overall data transmission speed in the LAN will be seriously affected. Once we find that the data transmission speed in the LAN is slow, we may wish, use a dedicated network management program to view the data traffic of the server port, switch port, or LAN port of the router and Wan port, you can also use the netstat string command that comes with the Windows system to calculate the data traffic information of each core port. Find out the specific location where the network transmission bottleneck occurs based on the view or test results, and then find a way to increase the bandwidth of the corresponding port. There are many methods to use. For example, if a network bottleneck occurs at the NIC of the server, we can try to Install Multiple Nic devices on the server at the same time, or upgrade the NIC device to 1000 M or even M, if we find that the Network bottleneck occurs at the switch port, we can use VLAN Division to achieve the purpose of network data traffic distribution. If we find that there is a network bottleneck at the router port, then, we can correctly configure the bandwidth parameters of the vro to increase the network bandwidth. In short, according to the specific location of the Network bottleneck phenomenon, we can always find the corresponding method to effectively avoid the network bottleneck phenomenon, to maximize the speed of lan network data transmission.

Starting from the network cable to speed up the network
As we all know, the twisted pair wires contain four pairs of line order, which are wound together in strict accordance with special regulations, this helps reduce the impact of background noise and Crosstalk on network signal transmission. In addition, in the T568A and T568B cable standards, the twisted pair wires only use four serial numbers: 1, 2, 3, and 6, among them, line 1 and line 2 are specifically used to send data information, and line 3 and line 6 are specifically used to receive data information, and the T568A production line standard and the T568B production line standard, line 1, line 2, and line 3, and line 6 must both come from one bypass pair. Only in this way can the impact of crosstalk and background noise on data signal transmission be minimized.

However, in the actual process of creating network cables, many line laying staff did not follow the standard to make network cables. As a result, LAN communication has a great risk, there may be two specific phenomena. One is that the transmission speed of the LAN network is normal at the beginning, but after a period of use, the network transmission speed will gradually slow down, another phenomenon is that the local network transmission speed is very slow at the beginning. The previous fault is particularly evident in desktop computers, but it is often not obvious in laptops. After repeated practices, I found that the slow network transmission speed caused by network cables not strictly produced in accordance with the standards also has a certain relationship with the network card quality used by the workstation. Generally, the performance of NIC devices installed on a laptop is better than that installed on a desktop computer. Therefore, when you use the exchange method to troubleshoot slow network transmission failures, using a notebook to check whether the network transmission speed is normal does not simply eliminate that the current network connection cable has no problems in production.

In order to avoid the slow speed caused by network cables as much as possible, we must strictly press the network cables according to the production standards when laying the lines at ordinary times. To eliminate the problems of the Network cables, we cannot simply use a laptop to replace the test, because the test results are not very accurate and it is easy to lead to detours for troubleshooting!

Starting from a broadcast storm to speed up the network

To promptly discover new unknown devices in the network, the LAN usually uses broadcast information to identify changes in the network. However, with the gradual expansion of the LAN network scale, the number of workstations contained in the network is also increasing, and the number of broadcast data packets will also rapidly increase accordingly, once the number of broadcast packets in the network reaches 30%, the data transmission efficiency in the LAN will be significantly reduced. When the NIC device in the LAN is damaged or other network devices are damaged and are not immediately removed from the network, these damaged devices will continuously send broadcast packet information to the network, as a result, a broadcast storm occurs in the network, which slows down the network transmission speed. Otherwise, the whole Lan may be paralyzed. Therefore, if hardware devices in the LAN are accidentally damaged, they can also cause broadcast storms.

When we suspect that there are damaged network hardware devices in the LAN, we must first take a replacement method to temporarily replace the switch or hub device to see if the switch or hub device is damaged; if no fault is found on the switch or hub device, we may close the power supply of these devices, then, in the DOS environment, use the "Ping" command in the Windows system to test the NIC address of each workstation one by one to see if the NIC address of the computer can be pinged, if the IP address of a NIC device cannot be pinged, the NIC device may be damaged. In this case, we may try to replace a new Nic device, I believe that this will restore the local area network data transmission speed to normal. According to my practical experience, Nic devices, switches, or hub devices in the LAN are most prone to hardware damage. Many reasons for slow network transmission are caused by these factors.

Starting from network viruses to speed up the network

In many lan Internet sharing environments, we often cannot resist the crazy worms from the Internet. These viruses have an increasing impact on the data transmission speed of the LAN, in addition, the damage also increases gradually. In particular, Web worms that spread via email often cause infected workstation systems to send spam and virus emails to the network without stopping, then, the network keeps returning junk and virus emails to the workstation system, so that the limited bandwidth resources on the network will soon be exhausted, in this way, there will be obvious information congestion in the LAN network, which will eventually lead to slow network transmission speed. In severe cases, the network will be paralyzed.

Therefore, in order to avoid the slow network transmission caused by viruses, We must promptly upgrade all anti-virus programs, as well as the computer operating system, and install various security patches in a timely manner, in addition, some unnecessary network services in the computer system are temporarily stopped and all unused network ports are closed, in this way, we can effectively prevent various network viruses from attacking the LAN.

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