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How to use an IP address to troubleshoot a network connectivity issue

After you have located the IP address, you can use it to solve connection problems.

For example:

• If the format of the IP address is 169.254. x.y, the computer is probably using APIPA, which means the computer’s DHCP client was unable to reach a DHCP server to assign an IP address. When this occurs, check the connection to the network.
• If the IP address is located in Class A, B, or C (the IP addresses reserved for use on private networks), make sure that another computer (an Internet Connection Sharing host) or a router or residential gateway is routing Internet requests to a properly configured public IP address.
• If the IP address appears as 0.0.0.0, either the computer is disconnected from the network or the static IP address is a duplicate of an address that already exists on the network or the IP address is released.
• Make sure that the user is using the correct subnet mask for computers on the local network. Compare the IP settings on the computer that is having problems with the IP settings on other computers on the network. The subnet mask settings must be identical on all network computers. The first, second, or third sets of numbers in the IP address for each computer should also be identical, depending on the subnet mask.
• For example, if a subnet mask is 255.255.255.0, it means that the first three sets of numbers of the IP address must be identical. In this example, 192.168.0.83 and 192.168.0.223 can communicate, but 192.168.5.101 cannot communicate because it is not on the same network.
• Likewise, if a subnet mask is 255.255.0.0, the first two numbers in each IP address must match. For example, 172.16.2.34, 172.16.4.56, and 172.16.83.201 are all valid addresses on a subnet with this mask.
• In every case, the gateway computer must also be a member of the same subnet. If a router, switch, or residential gateway for Internet access is used, the local address on that device must be part of the same subnet as the computers on the network.

Etiquetas: Diagnosticando Problemas de red