Not the Dud but the Dude
Brendan from Sentinal was kind enough to point out a new open source network mapping tool. It looks really good and so far seems to work! It’s called The Dude, probably sounds better in an American accent, and I tried it on our test network with the following results.
There are more screenshots on the Microtik website.
Did I mention that it’s free?
I haven’t had time to compare it to other tools but it was simple to install and it worked first time.