How to trouble shoot Windows Network.

How to trouble shoot Windows Network. First step is finding what is connected to what and how it is designed in Windows network by simply running IPCONFIG and the LAN details Windows GUI. Pic: Windows Network Connection Details Here in the Windows Network connection Details you can find Whether the network interface is up or down, obtaining an IP address either DHCP or static, Whether you have an IP address, no IP address, or an automatically obtained IP address, whether you have DNS servers configured if they are configured what are they etc along with this information you can find your default gateway. What to do If the Network Connection is down? Please Look at the OSI model, the physical layer (layer 1) is at the bottom. If layer 1 doesn’t work then NOTHING else is going to work. It is best to troubleshoot from the “bottom up” (from layer 1 up to the higher layers). Pic of Media state issue. In the pic above, you can see that the Media State is Enabled which is very normal and fully-functioning state. If the media state is disabled then you need to Check the network cable – is it unplugged? Disconnected? Cut? Also Check the network switch whether the network cable connected there? Is the port enabled? Make sure to find out this information first. What to do When you don’t find IP address? Whether you have no IP address (0.0.0.0) or an automatic private IP address (APIPA, starting with 169.254.x.x), it doesn’t matter. You’ll have to obtain an IP address before you can use the network. If you are set to use DHCP (likely the default) and your DHCP server is down then that is the reason that you don’t have an IP address. You can solve the problem either by Resolving the issue with the DHCP server Or Statically assign an IP address that isn’t in conflict, is on the right subnet, etc What to do when No DNS Servers are there? When you see that no DNS servers are not configured then you’ll be able to communicate on the network with IP addresses only. You should be able to ping your default gateway, your DHCP server, and other servers on the network. However, you won’t be able to do any of that by name. That time you can solve this problem either Determining why the DHCP server isn’t providing DNS server IPs or Manualy configure the DNS server IPs if you know them or Configure public Internet DNS servers like the Google public DNS servers (like 8.8.4.4). Incase if you have DNS servers configured but you can’t ping them then you need to check the DNS servers whether they are hung or packets are being restricted through a firewall. What to do if there is No Default Gateway? If you have no default gateway IP address configured, it will prevent you from communicating on another IP subnet (like the Internet) but not from communicating on your local LAN. Even though with no IP default gateway configured, you should be able to work as normal with local servers. Configuring a default gateway is optional, you don’t need to reach an external network but you could manually configure a default gateway or determine why the DHCP server didn’t provide one for you. Incase, if you have a default gateway defined but you can’t communicate with it even with a ping then you need to check your local router. What to do if there is a problem with Misconfigured Subnet Mask? If you have an incorrectly configured IP subnet mask then you’ll get some unpredictable results. You either need to manually configure it ,if you are using static IP addresses or check the DHCP server to see why it gave you the wrong subnet mask.

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