When I was working as a sysadmin, I kept a spreadsheet. I was told later of a repository of information that supposedly was what my spreadsheet did, but it didn't add anything new and was much harder to keep up.
I built it up using nmap and then shelling into each individual machine and poking around to see what it did. This was back in the days before everything became virtualized, so each machine on the network was likely physical.
I added information by walking the aisles and copying down the rack location of every machine into another page on the spreadsheet. I eventually hooked up a terminal to them all and matched network addresses to physical machines.
Only took a few weeks and when I was done, I knew things about the network that guys who worked at the business for years didn't know.
There's no substitute for the good old-fashioned way.
I liked that job, it was fun.
I built it up using nmap and then shelling into each individual machine and poking around to see what it did. This was back in the days before everything became virtualized, so each machine on the network was likely physical.
I added information by walking the aisles and copying down the rack location of every machine into another page on the spreadsheet. I eventually hooked up a terminal to them all and matched network addresses to physical machines.
Only took a few weeks and when I was done, I knew things about the network that guys who worked at the business for years didn't know.
There's no substitute for the good old-fashioned way.
I liked that job, it was fun.