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Manual Network Mapping

Oct 29, 2015
Looking to get recommendations on software for creating a manual network map/diagram.
It doesn't seem like something that should be particularly difficult to create but so far I haven't found much that has been super helpful in creating a network map.
I've tried a few different ones like Intermapper, and a few online ones but they don't quiet seem to work or fit my needs.

Basically what I would like to do is create a tree diagram starting with the modem and branching out to the different devices on the network and really hoping it can include port numbers and all that fun stuff.
I realize I could make something like this in powerpoint but that is going to take some time to make, edit, and make it look "purdy".

Thanks in advance!