Internet sharing web troubleshooting examples

The emulating is a line to penetrate the work in the ISP's technical staff for six annuals to write,Asics Women's Tokidoki Mex Lo, and may not have many use, but problems in the network to find problems to solve the problem of drawing a lot of experience!

first failure for everyone to write five instances, I meditation it is a mutual Internet cafes, which I ordinarily approve several more failures.

1, cafes off the network frequently arose in the case. (Internet machine 60, 100M star local area network structure, 10M and 8M Netcom telecom fiber, Flying Star 4500 router)
Symptom:
received the call when the time is 3:00, only 10 were Internet cafes in more than one human, a taxi arrived at the scene asked Internet cafe owners in some cases before a failure occurs, the owners answer middle of the night nought else, see the switch too much dust more, then slice was dust, all achieved the job after the ten minutes after the melodrama happens, and each dropped after the restart all the equipment can only be retained for a tiny while, and then is off the web, looking for a long time did not find causative, so he called repair.
process:
first observed switches, the switches found in cafes all within the network lights are in the same frequency in the flash, disconnect the LAN, using a laptop directly connected to the router on the Internet test, everything is normal, the fault clearly lies in the LAN, all switches off among the cascading line, first plug in the main switch, without exception, and then one of the access points of a switch, when receiving the third failure occurred, to check that the switch on the cable , in order to fast troubleshoot problems, it switches all the network cable I have been plucked down, and then plug it back in one by one, finally found a network cable is the cascade line was inserted in the same switch, causing data circulate, after unplug the network cable that root back to normal.
Fault Summary:
after completing troubleshooting so I asked the owner why the plug, the owners did not pay care at that time said, saw the first crystal switch on the cable go out into the plug, do not understand which network cable is Gansha, alas, I can only laugh and tell the owners later, when Network cable is best to have a technical presence of another push.

2, Internet network is slow. (Internet machine 120 (single gist), 100M star local area network structure, 10M and 8M Netcom telecom fiber, Flying Star 4500 router)
Symptom:
p.m. is to find information office, received a tel answer to the owners of Internet cafes Internet cafes playing games that storm cards, ping the LAN gateway still there-2ms, restart all network devices within the Internet can only continue in 2 minutes Then, or cards, do not know how this is going, amuse help me deal with the past.
process:
arrived at the scene after the cyber cafe because the network card because the case has been in full out of the empty half of the seats, passing the cashier when there has been circled by the customer requesting a repay, the owners took me to the room and notify customers to temporarily stop all Internet access 5 minutes, five minutes to test the network. First disconnect the LAN, laptop directly connected to the router on the Gateway tests are <1ms, the router is working to restore the connection to the LAN will appear after a short while owners of reaction-1ms-1500ms even situation and severe packet loss, this time has been unable to open the router's management interface, and again Duankai LAN, landing router, the router Sheding lan3 mouth is the mirror port to monitor all network LAN access, use CommView software as the network capture software for LAN traffic monitoring, to restore the network within the network and found a great flow of 39 machines, accounting for almost 80% of the entire local area network bandwidth, go check it was found that customers play single games, so he quit the game and found He hung Thunder next thing, the task which more than 40 tasks at the same time to download, and are more than 4G file, and asked him it was doing, the other said in order to upgrade their account Thunder, after I would not have said, The customer is the boss and the network out of Internet cafes after a group of K. I do have over the troubleshooting.
Fault Summary:
This failure happened in June 2007, Internet use of all AMD CPU, later work found that dual-core CPU unpatched case ping is chapter of the machine there will be a negative situation, this case belongs to the network fault failure, because after a negative analysis of a ping pouch should be sent out later to return the results for too long, which leads to a negate number, great delay occurs when out of range of the negative, so everybody in the failure process This fault is found not to alarm, then failure will soon be cautiously inclined of.
3, cafes frequently disconnected (300 machines, all-star 1000M LAN structure, double-40M 40M Netcom telecom fiber access, Huawei firewall, remember what model)
Symptom:
20:00 more relaxed being at home seeing TV, tel reminisce, made in a hurry on the Internet, said he kept the break, the cause could not, queried me to help deal with failure.
process:
taxi arrived at the scene later, Internet cafes are everywhere shouting voices, friends who work in cafes Needless to say, it's all the hurrahing and the shouting of the network dropped into the room and found the main switches and fiber-optic transceivers lights are flashing in an exceedingly quickly rate, indicating the tall traffic, using a notebook directly chained to the telecommunications fiber optic transceiver on the test, found the notebook click on the CPU utilization to 100%, do not test, and was attacked. Then on receiving the optical transceiver test Netcom no exception, so being only take Netcom fiber, restoring the network, so that the Internet is temporarily quiet for a while, then contact the telecom chief office replacement IP residence, failure to so buttoned up, took less than 20 minutes.
Fault Summary:
was attacked with the owners that the owners do not trust that after the aggression will cause such a huge shock, and that I have spent tens of thousands to buy a firewall it, how could engage in such a bad attack, I mention you export bandwidth is 40M ,Asics Onitsuka X Tokidoki Fabre, the additional celebration if the flow is greater than 40M attack you, what use are not on the firewall, so Internet cafes where you buy a firewall that are not used. Owners listened to me did not say everything, after more than a month I once again to assist them handle with failure, it was found that firewall has evaporated, replaced along 2 sets to do with the configuration of the machine quite soft route.

4, unstable speed Internet network (160 machines, 1000M star regional district network framework, 20M telecom fiber, 12M CNC fiber, Ruijie NBR1100 router)
Symptom:
than 2 pm, received the cafe's phone, the reaction is often damaged while playing the game, you can visit repeatedly, yet will also break out.
process:
After reaching the phenomenon of Internet
repercussion as employers, purchasers entered the game aboard exhibit had played a meantime after losing connection with the waiter, ping the DNS finding telecommunications as a tarry of extra than 20 ms, as a more than 300 ms, the CMD tracert mandate namely accustomed to detect the routing way, ascertained in more than 20 ms lag period namely taking the telecommunications lines, more than 300 ms delay in the period line namely taking the CNC, the problem lies in the router, the owners want to administer passwords, into the router's network interface to retard and ascertained not problem setting, in the CMD, using telnet into the router, below the authorization of the super-set into the install re-routing, route saving inspected later almost 2 hours, no repetition of such locations, troubleshooting completed.
Fault Summary:
Ruijie router in the later work the first time I found the best time of installation to configure the router using telnet login, after re-configured into the web treatment interface for two-set, I think it is the manufacturer of the problem, and this problem is persistent.

5, the network is slow (40 machines, telecommunications 4M unattached, tree topology)
failure phenomenon:
the cafe part of the machine speed is natural, part of the machine is slow.
process:
to Internet cafes really observed carefully after using the tree topology, it manner a switch in series a go in the medium there is really a 10M HUB, the problem lies in the HUB on, 16 , the base also has a 24 sequence switch, effective the owners that will influence the network connection speed suggested star topology, but the owners told me that in the past so then did not find the problem,Asics Australia, only recently discovered, I have 24 switches with 16 HUB interchangeable a morsel location, and speed resumption of some part of the machine, disconnect the HUB network speed after taking a step ahead recovery, confirmed my judgments, communicate with the owners once again to tell him my thoughts on the made me furious, that you left a few folk look at my Internet, and you toss TM Han, depart me speechless back unit, the cafe is probably insisted on more than an month of affair, because the benefits can not.

above is part of the troubleshooting process, perhaps there will be some help fknow next to nothing ofme people, retinue a network failure occurs to me that the order after the investigation,Asics Rotation 77, according to the order, then basically can be done quickly to resolve the fault scope and fault .
1, dropped fault:
failure occurs is dropped
Internet network upkeep workers the most troublesome problem, in truth, no, first is cool, ignoring customers call, meditation observe the action of network equipment, such as network lights flashing frequency, the higher the frequency shows the greater the flow, otherwise there is no flow or flow is very small, off network access from the side after starting the investigation, such as fiber optical transceiver from the start search, find computer directly connected to the optical transceiver, configured on the machine Public IP to access the test, if the normal lines normal the ISP, the problem lies in the cafe, not normal to direct repair.
2, frequent separation fault:
frequent disconnection mistake failure dripped more complicated than the investigation, frequent dripped shrieks for of many causes, ISP problems and issues within the network are probable to occasion such a failure this time or need to search from the beginning from the way side, using a microcomputer single access fiber-optic transceiver test, if time is no problem the ISP of the line is working, if way stand-alone entire this happens you need to mend, and immediately the national conveyor in the maximum used appliance is the battle of , beginning with K type optical transceiver has a white button is the button many times injury me, for this button switches the inner oxidation of penniless contact, resulting in some broken and chances frequent Internet cafes,Asics Mexico 66 Lauta, often most of the night toss me, then this situation back to the factory after factory repair and replacement of our group of equipment, but still there are many ISP's internal use of room, so we can see at.
Another circumstance is among the network problem, this time no the premier virus to find a machine instantly joined to the router on a single test, whether properly you need to check if there are problems among the network alternate, wire contact is good, Crystal There is a sign of oxidation, the machine for viruses within the network, in that mandate, then presently there will be search results. Able to do so can be used to replace the usage for troubleshooting.
3, the network is slow
network is slow because there are many, often encounter the owners Jijiwaiwai the Internet to call me to ask Why so slow, what is more straight screams, faced with this problem First, I expressed compassion and knowing, Internet access to stand-alone testing, such as Internet bandwidth is actually open 4M, then a test on our home sheet download speed should be around 400KB, less than the speed of contact room deal approached on the Internet to search within the bandwidth expense , generally occur in this small Internet cafes, low-bandwidth petitions, and then also have to poll people watch movies online, or download a few open, no card truly curious. Of lesson,Asics Mexico 66, when the individual is also a failure by the ISP's backbone causes, this time we can do is await, and no better solution to the