We all know, or should know, that documentation is important. The question is how does one go about documenting I.T. infrastructure? There are so many different methods and so many different things to document that just getting started can be a daunting task.
Several years ago I worked for a company that insisted, in no uncertain terms, that full documentation exists. They had a Word document that they used, which I recently learned was at least in part based on an old project called NetworkDNA by Don Krause.
NetworkDNA seems to have been abandoned. The web site that was associated with it is no more, and it is difficult to find any of the original files. I did manage to track them down here.
I have basically forked the old NetworkDNA project and created the I.T. Infrastructure Documentation project on Github. All of the files are released under a very permissive Creative
I hope this helps.