Need to identify IPs of PCs from switch

  • Thread starter Thread starter Sam
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Sam

Hi,

I'm dealing with a network with no documentation. I need to figure out the
IP addresses of devices connected to each port on the switch. There are two
HP ProCurve and one NetGear switch on the network.

How can I find out the IP addresses of devices connected to a switch's ports?
 
Sam said:
Hi,

I'm dealing with a network with no documentation. I need to figure out the
IP addresses of devices connected to each port on the switch. There are
two
HP ProCurve and one NetGear switch on the network.

How can I find out the IP addresses of devices connected to a switch's
ports?
Click to expand...

I think you need to read the manual for your switches. Do they have a
management mode that you can access from your PC?
 
Sam said:
Hi,

I'm dealing with a network with no documentation. I need to figure out the
IP addresses of devices connected to each port on the switch. There are two
HP ProCurve and one NetGear switch on the network.

How can I find out the IP addresses of devices connected to a switch's ports?
Click to expand...

Failing the availability of some cleverness peculiar to your switch, run
a series of command prompts in which you ping each device with the "-t"
argument (endlessly repeats) and then start yanking cables out! If you
have zillions of hosts you might want to use an automated scanning tool
like http://www.lookatlan.com/, although some of these don't detect
offline status instantly (as ping -t will, almost).

Phil, London
 
I been where you are.

But I think you should approach that differently.

First Switches are Layer2,...they wouldn't know an IP# if they tripped over
one.

Second, it just isn't important to know the IP#. In a DHCP environment it
changes anyway.

You want to start with the physical cable Labling. At the back of the Patch
Panel label them with a label that dscribes where the opposite end is, like
"Sales Room, Desk4". Then at the user's desk put a lable on the cable *and*
walljack that specifies the PatchPanel & Port #, like "PP2 Port 23". If
you don't use Patch Panels and plug directly into a Switch,...well stop
doing that and introduce Patch Panels,...but in the meantime lable according
to the Switch like "Sw2 Port23".

Then you need a Diagram of the floor plan. Show on the diagram, the Wall
Jacks, the Desk ID, and the Machine Name. I would not waste my time with
the human at the desk,..humans come and go all the time. You can add the
human to the machine's Description Field in ADUC if you want. In fact with
that thought there are a lot of things you can put in the Machine's
Properties in ADUC that are good for documentation.

Create a spreadsheet of all Statically Assigned equipment (anything not
DHCP). I keep the fields:
IP, MAC, Netbios Name, Description.
Much of that information can be gathered with a tool such as Netscan from
SoftPerfect www.softperfect.com .


--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
 
Unless your switches are "managed" switches, ones that contain a fair amount
of intelligence, the response is "No, you don't.". Many more details than
what you have provided are necessary before we possibly get from "No, you
don't" to "Yes, you can if you ..."
 
Sam said:
Hi,

I'm dealing with a network with no documentation. I need to figure out the
IP addresses of devices connected to each port on the switch. There are two
HP ProCurve and one NetGear switch on the network.

How can I find out the IP addresses of devices connected to a switch's ports?
Click to expand...

Install Nmap. Then install Zenmap so that you can figure out how to use
Nmap. The Nmap program uses a combination of brute force and sneaky
techniques to convince even devices that aren't willing to talk to give up
their secrets. The Zenmap program provides a front end graphic interface.
Both programs are available here: http://nmap.org/
 
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