how do I get an understanding of a network I didn't build?
Posted on 2005-04-13
Please forgive the novice question, but I know very little about networking. I am volunteering for our local public library, and I have been tasked with adding wireless capability to their current network. I have a feeling for how I will do this (with Cisco 1100s), but I need a better understanding of their existing network. They have a Cisco 1720 router, Catalyst 2900 XL switch, and a Dell server running Windows Server 2003 and IIS. I have no idea what IPs have been assigned to either the router or the switch, so I can't see 'inside' them to aid in my task. I want to find out if there are VPNs defined in the switch, and if so, what they are. I understand there is a console interface to the switch, but I do not have a cable to connect to it. I also understand that there is a web interface to the switch, but I have to know the IP address of it, which I don't. Unfortunately, the person who set up the network originally is no longer available, and he/she left very little documentation. I know that the server is at 10.0.0.2. I could not browse to 10.0.0.1, or 0.
So my question is, is there a utility that will help me draw a topology of my network, telling me what IP addresses are assigned to which boxes, etc.? What's the best way for a novice to get a good handle on this configuration?
Thanks in advance for your help,