Network management experience: LAN Maintenance Optimization Skills _ Application Skills

In the construction and maintenance of local area networks, there will always be a variety of problems. Troubleshooting and optimizing the system is one of the most basic tasks in managing a local area network. I have been engaged in network management work for eight years, the following is usually accumulated in the work of some of the small experience and everyone to share, including troubleshooting, optimize the performance of the point of view, a simple summary of some of the LAN maintenance and optimization of experience and skills, to discuss the network card, the correct installation of network cable, reasonable settings and so on.　　Hope that we can better to maintain the computer, management network, so as to better use the network to carry out the work. Do you want to do the work more efficiently when you do LAN maintenance, whether you can hit the network problem in the middle? Let's talk about the maintenance and optimization of the network briefly.
1, according to the rules to connect
Connect the local area network each computer is uses the twisted pair line to realize, but does not use the twisted pair to connect the two computers simply mutually, can realize the communication goal, we must follow the certain wiring rule to carry on the connection. The UTP connection distance cannot exceed 100 meters, and if you need to connect two computers over 100 meters, you must use a conversion device.
We also have to make jumpers when connecting the conversion devices and switches. This is because Ethernet, is generally using two pairs of twisted-pair lines, arranged in 1, 2, 3, 6 position, if the use of not two pairs of lines, but the original pair used by the line separate use, will produce a large crosstalk, network performance has a greater impact. 10M network Environment This situation is not obvious, 100M network environment if the flow of large or long distance, the network will not be able to unicom.

2. Check the NIC when there is trouble
In the LAN, the phenomenon of the network is often occurring, once encountered such a problem, we should first carefully check the network of the machine, network card settings are normal. When checking, we can open the Control Panel/System/device Management/Network adapter Setup window in turn by using the mouse. Check for interrupts and I/O address conflicts in this window (it is better to set the interrupts for each machine to be the same for comparison) until "This device is working properly" in the properties of the network adapter. And you can find yourself at least in your network Neighborhood, indicating that your NIC is configured without problems.

3, confirm the network cable and networking equipment work properly

When we check the NIC is not a problem, at this time we can use the Network Neighborhood to look at other computers on the Internet, if you can not see the other machines on the network, this situation may be due to the problem of network connectivity interruption. Network wiring failure usually includes the network line internal fracture, twisted pair, RJ-45 Crystal head contact is bad, or the network connection device itself quality has the problem, or the connection has the problem. At this point, we can use the wire detector to detect the line is broken, and then use the alternative method to test the quality of network equipment is not a problem. In the case of the network cable and the NIC itself, let's take a look at the reasons for the software setup, for example, if the interrupt number is incorrect, it may cause a failure.

4, check the driver is intact

After checking and confirming the hardware, check the driver itself for damage, and if it is not damaged, see if the installation is correct. If these can be judged to be normal, the device does not conflict, or cannot be connected to the network, the network adapter can be removed in the system configuration, then the computer is restarted, the system detects the presence of new hardware, and then automatically looks for the driver to install.

5, correct to set up the network card

When you are sure that the network media is not a problem, but still cannot be connected, return to the network card settings. See if there are conflicting device resources, and there are many times when conflicts are not always prompt. Possible device resource conflicts are: NE2000 compatible NIC and COM2 are in conflict, all using IRQ3, (Realtek RT8029) PCI Ethernet network cards and display cards are "like" IRQ10.

In order to resolve this device conflict, we can follow the following steps to set up: First in the Settings window will be COM2 screen, and forced to interrupt the network card to 3; If you encounter a PCI interface network card and video card conflict, we can use do not assign IRQ to display card solution, is to set the Assign IRQ for VGA in CMOS to "Disable".

6, disable the PNP function of the network card

Some network cards, although support PnP function, but the installation of good found and can not work well, or even work. For this reason, we can use the PNP function of the screen card to solve this problem. To disable the PNP feature of the NIC, you must run the Setup program for the network adapter (typically in the driver package). After you start the Setup program, go to the Settings menu. Disables the PNP function of the NIC and modifies the IRQ that can be set to a fixed value. Save the setting and exit the Setup program so that if no other devices occupy the IRQ, you can guarantee that there will be no IRQ conflicts.

Also, if you are installing the Windows 98/2000/XP operating system, you must ensure that the operating system does not treat the corresponding interrupt type as a PnP-capable IRQ, so the type of interrupt in CMOS will be modified by "Pci/isa PnP" to "Legacy ISA ”。 Use this method to resolve device conflicts for most PNP network adapters, but not necessarily for all PCI network adapters, because some network adapter setup programs do not provide the option to disable the PNP feature at all.

7, reasonable set up the server's hard disk

Users who use the LAN office often use the network to print materials and access files. For some reason, the speed of network access may be abnormal, then we tend to mistakenly think that the cause of the lower network speed is likely to be a bottleneck in some devices, such as NIC, switch, hub and so on, in fact, the most impact on the speed of the server's hard drive. Therefore, the proper configuration of the server's hard disk in LAN will greatly improve the network performance of the whole LAN. In general, we need to consider the following factors when setting up a hard disk:

The hard disk in the server should choose the speed quickly, the type of large capacity, because the hard disk speed, access to the data on the server through the network faster;

The hard disk interface in the server is preferably a SCSI model because it is faster to transmit data than the IDE or Eide interface, and it transmits and accepts data in a parallel mode of data transmission;

If the condition permits, we can install the hard disk array card to the network server, because the hard disk array card can enhance the hard disk read and write performance and the security greatly;

Of course here you should also note that in the same SCSI channel, do not use Low-speed SCSI devices (such as CDs) with the hard disk, otherwise the SCSI interface of the hard drive data performance will not be played.

8, the strict implementation of grounding requirements

Because in the LAN, the transmission is some weak signal, if the operation is slightly improper or not in accordance with the specific operating requirements of network equipment, it may be in the network interference information, serious can lead to the entire network is not through; especially some network transfer equipment, because it involves remote lines, it is very strict grounding requirements, Otherwise, the network equipment will not reach the specified connection rate, so in the process of networking to produce a variety of inexplicable fault phenomenon, to our work brings great trouble.

9, the use of good quality, fast new network card

In the local area network, the computer cannot communicate with the computer is very common matter, causes the breakdown reason possibly to have many. Statistics show that most of the faults in LAN are related to network cards, or the NIC is not properly installed, or network line contact is bad, there may be an older network card, can not be correctly recognized by the computer, and also some network cards installed in the server, can not withstand the impact of large-capacity data, and eventually scrapped.

Therefore, in order to avoid the above phenomenon, must be willing to invest, if the network card is installed in the server, be sure to use the quality of the network card, because the server is generally uninterrupted operation, only the quality of a good network card can be a long time to "work", in addition to the server transmission data capacity So we purchased the capacity of the network card must match, so as to achieve "good horse with a good saddle."