Here is a network Diagram containing a Windows host running Dynamips and Dynagen using a loopback adapter to communicate with a single virtual 3640 router.

The TACACS+ Windows executable can be downloaded from here.

First step is to extract TACACS+ zip file into a directory of your choice (in this example, I used c:\tacacs). Next, edit the configuration file as needed to define server characteristics and users. Be sure to edit the configuration file in an editor that supports UNIX file types. You will be fine if you open the existing file in an editor that doesn’t add <CRLF> characters at the end of each line (so don’t use Windows notepad, although Wordpad will be fine).

Start the TACACS server with the following command:

tac_plus -C tac.cfg

The warning regarding not running tac_plus as root can safely be ignored. To verify the tacacs+ server is running, open task manager and go to the processes tab – you should see tac_plus.exe running:

If you need to stop the tacacs server, just select it in the task manager list and click on End Process.

Dynagen configuration with one 3640 router instance