Troubleshooting IP Routing

Points to remember
1  Check the path. Ensure that the router has a configured path to the source and destination.
2  Check the network. Verify that a routing loop or other routing protocol is occurring. It is important to be able to trace the routing loop in case the problem occurred during a hop between the source and destination.
3  Check the physical network connection. Verify that the LAN segment in use is operable and functioning correctly.
4  Check the resources. Verify that one router that is not in use is not prohibiting the operation of the operating router because of a lack of memory. If so, disable the blocking router by moving it to a temporary folder.
5  Verify the IP address configuration. Check for duplicate and static addresses or verify that the IP address is properly configured.
6  Check for packet filters and firewalls. Filters from the path and firewalls may be preventing traffic from IP address or protocol.

If you are working with a large network, have a diagram to describe the path. To properly troubleshoot path issues, you will need to be able to compare the path that the router took and the path that is suggested by the diagram.     
If you find that the problem is coming from the server, you will need to contact an administrator who has access to the network server. Be sure to document the steps you took to troubleshoot the IP routing protocol.

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