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Please does anybody have an idea of the oid the cisco 3600 series uses to graph the number of users connected to the router either via tty lines or the console port.
You could use a Mikrotik Router box.www.mikrotik.com. all you'll need is the license -under $45. You can then configure each known ip address on your network under the queue simple menu. Since you are getting a number of DOS attacks. I'll suggest tha...
You could also configure a MikroTik box as a bridge. You can then use the Torch tool to check the type of traffic on a protocol, source address, destination address and port basis. I've found this very useful.You could also use Netenforcer from Allo...
For a cheap option, I suggest you try IP-tools www.ks-soft.net/ip-tools.eng . You can discover devices on different subnets using this tool. Ipswitch What's up Gold can also be used to map the devices and monitor them real time.