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I recently managed a router installation for a client and thought it would be helpful to share the issues I encountered, along with the techniques I used to overcome them..
In this case, we took a Cisco 2851 Integrated Services Router that was sitting on a shelf and turned it into a DNS proxy. Inevitably, when you plan an installation you will forget something. What separates a successful installation from a failure is how you deal with what you forgot. In the following video, you will see how I determined that the incorrect router port was connected as well as the wrong VLAN.
With this installation there were a few factors that helped the troubleshooting process:
The DNS proxy wasn’t in production and will be phased in, so it wasn’t critical that be up ASAP.
Even though the tech powered on and connected the router to the network and left, he would be back Monday morning to assist if needed.
I set up a computer with a console cable and had VPN access for testing and/or troubleshooting.
I can’t stress enough that you should have the access and ability to test during an installation outside of your fancy network management system. The network analyst needs to have a good grasp of basic troubleshooting commands as well as a network diagram.