Troubleshooting Network Problems

Troubleshooting Network Problemsby Mudin · June 7, 2009By Ki GrinsingForewordArguably the most of your home does not have the tools or tools to troubleshoot network problems such as LAN tester, Multi-meter or the like. We know that our computer network is not always going to go according to our expectations to be at his best. Once there are times when we experience a network problem that requires us to look for troubleshooting the problem and restore the network as normal.Troubleshooting toolIf in a complex enterprise-class network, a network engineer or some use tools to troubleshoot network problems eg with network management tools for detecting points of damage, LAN-tester, multi-meter etc. As for the network dirumahan you do not need or none of these tools to fix your network problems.Diagram network conceptFigure 1 below shows the LAN network diagram dirumahan used to share an Internet connection such as Speedy or other Cable networks where the network device that is commonly used is a modem-router connected to the Internet through your ISP, a LAN switch, connecting a network cable between modem- router with Switch, and multiple computers. PC-A is connected to Switch (port # 1) by using a network cable and PC -A-B-B network cable to a switch port # 7.In fact, as the above diagram is not exactly raw, but most devices in the market that combines the functions of a modem and router into one device. At Speedy network is usually much use wireless ADSL gateway call TP-link TD-W8960 or the like which also has an Ethernet port to the computer amounted to 4 either 100Mbps or Gigabit. In addition it also provides a wifi connection over the airwaves that could connect a laptop with wifi adapters, and some types of smartphones or tablet computer both based on Android, Blackberry, iOS (Apple phone) or Windows phone.Several kinds of network problemsThere are some situations where you have internet connection problem that requires you perform network troubleshooting.A> PC-A can not access the internet but PC-B canIn this scenario, the PC-A disorder can not connect to the internet, while the PC-B is not problematic at all. It can be summed up as follows:

    Internet services from ISPs no interference
    The possibility of switch or port is problematic
    Modem is not problematicTroubleshooting network problems that you can do is suspect there is a problem in the computer's NIC adapters, port Switch problematic, or the network cable-A problematic.a. NIC disabledMake sure that the NIC adapters PC-A you are not disabled accidentally. You can see signs of local connection icon (the computer image twins) bottom right corner of your screen. If normally you can see it now you do not see it, you should suspect if your NIC adapters in the disabled condition. In XP / 7 Go to Control Panel: Click Start> Control Panel> double-click the network connection> see if there are any local connection icon in the adapter you disable condition commonly characterized by a faint gray color as in figure 2 below.Figure 2 - Local connection icon and NIC adapter disabledIf it looks faintly gray, right-click the icon and select Enable. If successful, then you can see again the computer image icon bottom right corner of your monitor.Use the "ipconfig / all"You can also perform testing using the command 'ipconfig / all' on the command line. Go to the command line interface by pressing the 'picture windows' and the 'R' simultaneously and the Run Command type cmd and press Enter. Or you can use click Start> select Run> type 'cmd' and press Enter. At the command interface type:Ipconfig / all <press Enter>Then will come a series of configurations such as the following message:Windows IP ConfigurationHost Name. , , , , , , , , , , , : TOWERPrimary Dns Suffix. , , , , , , :Node Type. , , , , , , , , , , , : UnknownIP Routing Enabled. , , , , , , , : NoWINS Proxy Enabled. , , , , , , , : NoInternal Ethernet LAN adapter:Connection-specific DNS Suffix. :Description. , , , , , , , , , , : Realtek RTL8139 Family PCI Fast Ethernet NIC # 2Physical Address. , , , , , , , , : 00-1C-F0-F2-B9-A9Dhcp Enabled. , , , , , , , , , , : NoIP Address. , , , , , , , , , , , : 192.168.1.25Subnet Mask. , , , , , , , , , , : 255.255.255.0Default Gateway. , , , , , , , , : 192.168.1.1DNS Servers. , , , , , , , , , , : 202.134.1.10Use the "ping localhost"Or you can also use testing using command 'ping localhost' or 'ping 127.0.0.1' which serves to ensure the TCP / IP configuration you perfectly, see if you get a good response. If you get a RTO (request time out) then we can be sure that the TCP / IP configuration you are not correct or your NIC adapters in the disabled condition.b. Switch Port ProblemsPC-A does not have access to the internet could be because the port that is connected to the PC-A problematic presumed dead. In general, a switch is equipped with LED lights that represent each port. If the port is active / connected to a computer which again On, the lamp will light blinks rapidly alias.Check the network cable-A leads to what port number (in this case the port # 1) and see if the port # 1 LED lights blink fast or die. If you find the lights off, try to first remove and insert again strongly in both PC-A and also at the switch and see if there is a response. If still dead, then move the network cable-A to port empty eg port # 2 and see if there is a response. If the port # 2 turned out to be alive and PC-A can connect to the internet, then you can be sure the port # 1 is damaged. Mark the port # 1 is the sign 'tusak' or cover it with insulation.c. Cable Network ProblemsIf in step b above you do not succeed, then the next step is to make sure that the cable is in trouble. Swap-A cable with a network cable from the computer B-B and see if there is a reaction with LED Flash and PC-A can connect to the internet. If it can resolve the issue then you can ensure that the network cable-A problematic. Mark the cable with a 'broken' and replace it with a new one.B> All PCs can not Connect to the InternetIf you find that all the PC can not connect to the internet, chances are you have a problem:

    With Switch you, or
    With a modem-router, or
    The connection cable between the switch and the modem, or
    The problem lies with your ISP.If you find all the switch is off, make sure the power is installed properly, and if you still do not want to On, then you can be sure there is a problem with your Swicth. Replace with a new one or take it to the electronic workshop.If the lamp power and all ports are active (port # 1 and port # 7 in this scenario) turns On, then try to make sure the network cable connection between the modem-router Swicth well connected. Remove and reinsert the cable ends on both sides in the Switch and on the modem and see if there is a change. If it turns out to be back to normal internet connection, the connection your connection is not perfect.If the connection you can ensure a good connection, then try to replace the cable and see what resolve the problem or not. If successful, it means that the cable is problematic, marked by a 'broken'.If it turns out the problem persists, then you can call your ISP provider if there is a problem with the internet service.Stages troubleshooting network problems is commonly used for dirumahan although the concept can be applied in business class and enterprise network great.By Mudin

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