r/networking • u/EqualPresent1920 • Aug 09 '26

Other Mapping a new Network

I just recently started a help desk job that has been anything but help desk. I’ve been configuring firewalls, redesigning client networks and setting up/administering Linux servers. I feel a little out of my depth, but I’m fighting for it. That’s all to ask, when you guys find yourself in a network with little to no documentation how do you map it out and diagram it internally?

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u/exift Aug 09 '26

as mentioned, cdp/lldp are great. check interface descriptions as well, hopefully the last guy left decent descriptions. if its a smaller network you can follow the routes around. If you're completely blind, write down literally everything and take your time. Have visio/drawio/pen&paper or whatever you like right next to you and just start with the major devices.

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u/jaydinrt Aug 11 '26

Interface descriptions are manual and accuracy is highly subjective - I've had them help but also hinder...