【 Weak current College 】 go; addressing the network card hardware damage formation of LAN doesn't work (1)

In LAN maintenance and maintenance, we often encounter many strange network problems, these network trouble light you incur a slow task stops Internet or cannot go online, serious can incur LAN access, network channel attack attack perhaps network attack disintegration. If network problems attack in units in the local area network, then unit Office productivity can be lowered, and the network doesn't work if the attack in the operation of Internet cafes, so Internet cafe owners face is that economic losses. In order to help you better handle network problems, and this article the following from the actual point of departure for the introduction of a LAN that is not connected with sight, expecting the crowd from the illnesses wipe out process to receive inspiration!

To reproduce the problem

Use a multi-departmental unit D-Link brand 24 port AC machine equipped with a set of lines, the convergence of the offices in 12 sets of tasks, which Exchange machine stations equipped with resolution of a general category 5 twisted-pair cables and flat host room in Center of exchange machine adhere to the normal link, always the offices of all tasks in the station can be flat directly access Internet network LAN. Recently, a few days what causes are known, the offices of all the tasks are not resolved station LAN to access the external network.

The branches to the network of colleagues in emergency relief, habit-phone is a command, upon receipt of calls is rushed to the telephone network is something wrong with the site. To the wrong picture, choose a task stops executing Internet access tests, test results are aware of the branches network does not have access to the external network. Because you cannot access the Internet with the onset of the offices of all tasks in the LAN station, resulting in net-gauge the LAN connectivity out of the question. Think of this, the first test of the cohesion of the Department of communication and the exchange of units of the center of cascading cable, aware of the cascade cable did not loose sight of convergence interface.

But still a little worried about not deliberately seek to network cable tester, the cascade cable connectivity to perform the test, the result was aware of this cable connectivity to all normal, marked with the LAN cannot be connected illnesses and physical lines didn't shut. Is the interface between LAN AC machine port has any questions? net-man-out unit host respectively, careful observation it LAN Center exchange machine unit corresponds to the cascade port, aware of the signal lamp of task form everything is normal.

No alternative but to return to the offices of the local area network, and random testing of several sets of tasks, aware of the station will not only fail to resolve local area network access Internet network, or even a LAN internal tasks stand each other cannot Ping Tung, and cannot be resolved to search your computer for the purpose of the LAN computer.

Wipe out the process

Since the task in the local network station to each other or access, this indicates that the network doesn't work and there is no central exchange machine, that there can be a task in the LAN network card equipped with a stand questions? but think to all the tasks in the LAN station have the same fault, network-total of all tasks that do not stand for the network card is equipped with all the broken episode, as the preliminary estimate of the net-network problems are to be determined by the convergence of all tasks station equipped with AC machine loosed.

Careful observation of the D-Link brand 24 port AC machine, aware that convergence network cables all Exchange machine port, its corresponding light task forms are quite normal, do not see any unusual locations. Is there a system for the exchange of machine defects or other defects in the software? Lenovo to previous regular exchange machine attack cache error, many network maintenance often resolved to restart the Exchange machine or router, can be many hidden network problems to quietly rid of a loose, so the net-man also hold a try to reboot it a multi-departmental LAN AC machine equipped with, and when it came equipped with restart after the success of the Internet-try to from the LAN of wanton one task to access external station network, the results still exist with awareness network, which indicate the Exchange machine equipped with non-existent clear software error.

It is there to be communication machine episode hardware damage, for example all ports can not be normal task, perhaps internal Center chip attack wrong? in order to verify that the Exchange machine equipped with can really have a hardware fault, network-special from the Unit hosts to find room for a single standby Exchange machine to replace the original multi-departmental LAN D-Link AC machine; all tasks in the LAN station interface cable swapping into the new Exchange machine equipped with the network-see beginning a task in the local network station can access the external network, but continue to not much time, all task station has trouble before, and LAN task stood between access can not be normal. From this scene, LAN cannot be connected illnesses not by D-Link brand 24 port AC machine stir up!

Since the problems and exchange machine equipped with no contact, then, is what causes the formation of the offices of all tasks in the LAN station, in just a few minutes will not be able to resolve network performs normal access? why was very clear that the offices of the local area network broadcast storm scene in existence, must be broadcast storm provokes the branches to local area network in a short time to attack a network attack, thus making up all tasks station cannot resolve network performs normal access. The Department of the local area network broadcast storm scene in the end is how?

Is there a task stops in the LAN network card equipped with a hardware damage, attack with bad network card in the non-stop to send a large number of broadcast network information, thus incurring of LAN network attack attack wrong? think this, net-converge first resolution all tasks station D-Link AC machine power down, the LAN after each task points to perform the ping command to test to see which tasks station is notThe successful implementation of the "Ping127.0.0.1" string command.

Experience the long time of testing to find the network-man finally found something wrong with your computer, they will converge with the computer's network adapter cable pulled out, the net-reconnect the power supply AC machine D-Link, aware of the all tasks in the LAN station can access the contents of the Internet network, which marked with the broadcast storm scene had been successfully swept away. The following task nature is to replace the task stops with a new card is equipped with LAN, this can not be connected illnesses get Thursday.