IP Scanning Remote Site

[tparrettcisco]

I have a remote site connected to us with a Cisco 1941w router.  Equipment on this side is a 1941.  Working great.  I need to scan the remote site.  We only have a handful of devices there.  When I run Advanced IP Scanner from my desktop I get a response on every IP address

 I'm sure this is something easy that I should know, but I don't.

How can I run a scan on the other network from my desktop and get accurate responses of the machines on that network. Thanks for your help.

[Georg Pauwen]

Hello,

what do you mean by 'accurate responses of the machines on that network' ? What kind of data are you after ?

[tparrettcisco]

the screenshot shows that the replies I'm getting are all from the same mac address. I know that these are unused IP addresses and this is the router responding.

[paul driver]

Hello

you can do a broadcast ping from the rtr is you desire

Every subnet will have a subnet address and broadcast address

example:

192.168.1.0/24 

subnet address 192.168.1.0

ip range 192.168.1.1 - 254

broadcast address - 192.168.1.255

if you ping 192.168.1.255 then you should get a reply from every host that is active in the network subnet

res

paul

[tparrettcisco]

This is a good work around solution for me. Any idea why the router responds to every IP address that's unused?

[paul driver]

Hello

---

@tparrettcisco wrote:
This is a good work around solution for me. Any idea why the router responds to every IP address that's unused?

---

Because the rtr has an interface in the same broadcast domain, this is basically its a crude way of broadcasting out on to that network subnet to see what hosts reply , Some hosts will some wont depending on the O/S on the host.

In the previous example above that is a broadcast address which means = to all hosts

Could even try 255.255.255.255 also.

res

Paul

[mohammed01701]

Hi!

There is alot off tools that can scan another subnet remote but i am using this one:  https://www.netscantools.com/freeware.html whic is a free. Remember this tool is only Windows and there is a payment version, is upp to you to choose which you needed...

Are you using Windows desktop or onother?

/Mohammed

[tparrettcisco]

I was using Advanced IP Scanner on the screenshot above. I also own netscantools pro and love it. My problem is that the router is responding to all the unused IP addresses and I'm concerned the scan is not accurate.

[mohammed01701]

Hi!

Are you sure those arddresses is not active, Now i downloaded the  Advanced IP Scanner and i only see the responded addresses?

Are you sure you are not changed the default settings?  click on the view and see if yours is a same like the picture:

[tparrettcisco]

Here are the settings I'm using on advanced ipscanner  

and here's another look at the scan I did...this is just a clip

as you can see I have 2 printers on the network that respond, but the MAC address is wrong on both and the other IP addresses I know are not in use.  This is a small facility and since starting this thread I verified what IP addresses were in use.  Within my current network the scanner works great and does it job.  It's just when I try to scan the remote site that it doesn't work correctly.  I'm wondering if there's something I'm missing on my router configs to allow this scan to work.

Thanks.