LAN map?

Question

Computer networks

Hello, I am a novice system administrator and I need to find out how the network works in my office, namely to build a network map (in order to further configure remote access to each machine), advise programs for analyzing a computer network and building a plan, we have two buildings and each has its own subnet how to unite them? I want to centrally manage everything....

Answer 1

I dare to disappoint you - only by hand and by conducting a complete inventory of all equipment.
No analyzers and tools:
1) will not tell where this or that equipment is physically located, and where this or that cable is located
2) they will not show unmanaged switches hidden under the ceiling
3) they will not reveal jumpers, twists, bobbins, connectors, connectors without tongues. ..
4) they don’t know about turned off printers, servers, computers, IP cameras, and even about them not always, especially if they are on other subnets ...
5) they don’t show equipment behind routers
6) they don’t detect VLANs, routers , servers, virtual machines and other crap
7) will not give information about optics, transceivers, access points and other crap.
So only with handles, and with nmap / zenmap utilities for quick scanning of segments (and even then very preliminary).
So take floor plans, paste them as backgrounds in a vector editor (I use inkscape.org ) or draw on paper! Sample process - https://www.youtube.com/watch?v=M6j7HrRy9xw
Well, to start - https://www.youtube.com/playlist?list=PLqazFFzUAPc...
After a week or two, your level will be + 20 :-)

Answer 2

It is better to draw a map where which computer is located. Directly ask for a map of the building and draw squares.
This machine plan is of little use. He will draw you on a tree that the nodes are in one segment, the others are in another.
Here are the automatic iron inventory programs that are already worth it.
And if you need a simple ip map, then zenmap will do.

Answer 3

10 strike network scheme, trial for a couple of weeks

Answer 4

It is much more useful to take a network scan with all sorts of tools - and walk around on your own, following the wires. So, in addition to up-to-date information, you will receive a bonus in the form of knowledge of where and what equipment is located. And having learned the latter, it will not be difficult to estimate the topology.
Thoughtful smoking of configs of network glands is also recommended, of course. Take - and magically get information in a compressed and relevant form, how the network works, this is fantastic, this does not happen.

Answer 5

I advise a tool called "Legs" (with plugins "Hands" and "Head", however, performance depends on the quality of the firmware of these plugins).
Grab a pen and a larger piece of paper.
And they went with their legs on all floors - from one workplace to another. Check network settings, see how the cable is laid, etc.
We found a switch - described what was in it and how (literally: port1 - a green cord with a black dot, port 2 - a red cord with a green stripe, etc). If there is a model on it and some kind of identification, everything was rewritten, photographed, etc.
And so here are all the jobs and all the network equipment.
And only then, when the exit to the field is over (everything is rewritten) - sit down and start scanning the network using the information you have typed and build a logic diagram - where to switch, where what. The physics level layout is best drawn on a normal physical floor plan, the logic (simplified layout) is drawn in a vector editor like LO Draw or Visio.

Answer 6

The tool will very much depend on, shall we say, "many" factors. One way or another, the monitoring system is a custom thing. At one time, I really liked The Dude version 3.6 from Mikrotik. There, both graphical display and the ability to collect data from devices were at their best. But it is shorter for simple infrastructures.

Answer 7

If the network equipment is managed, then turning on and viewing the CDP / LLDP diagnostics will help you understand how they are connected to each other. The same information can be pulled from the mac-address tables on the switches, but a little more thoughtfulness is required.

Answer 8

algorius net viewer Set up
, draw a map with all the devices with pens (you can overlay it on the building scheme).
Of course, you have to run first. Raise the domain if not, it will greatly simplify.
well, plus some kind of excel file with all the addresses / passwords of the devices that you collect during the inventory.
Then just update.
batchpatch is another interesting software for managing Windows and collecting information from them.

Answer 9

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