I'm sorry but Currently my preferred method if the device isn't listed in Spiceworks: There was a time when I was a baby admin and I didn't want to raise alarms by installing a scanner that I wrote a batch file yes, that long ago that PINGed every IP on a subnet, then immediately ran ARP redirecting output to a text file. But that depends on the device in question being set to respond to PING requests.
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This does not work for any host on the other side of a router. Any hosts on the other side of the router will show the routers MAC address. I realize this is an old topic, but someone like myself may be looking for an answer. I became admin of a network with little over devices, which none of the cabling was mapped. I was told I was responsible for the cabling, so I began looking for a way other than toning out all the cables.
I was fortunate to have Cisco switches and Windows Server Furthermore I could also get the computer name from DHCP and correlate that to which user was on the machine using PDQ inventory to see who was logged in to the machine. Most of this of course depends on the devices being in use. I am interested in this thread, hopefully someone can help.
There are 4 types of arp message: So, that being said, is it possible to manually send a rarp request? Sort of a arp based ping?
Find the MAC Address of a Computer or Device
There is arping, but we need rarping Of course, I understand that I can't arp outside my default gateway, but if there is a rarp request, how is it used inside the local network? Thanks to whatever guru can explain what we're missing. My instance where I found this useful was after updating the firmware on a switch remotely via TFTP, the IP of the switch would change making pinging redundant, obviously. Trying a network scan over Spiceworks or rescanning the single device would not update the IP and I needed an alternate way to find it. This method worked perfectly. Thank you.
Determine IP Address From a MAC Address – The Back Room Tech
Hopefully this helps those trying to understand the purpose of this practice and how it was in-fact useful. I understand the issues in attempting to use a MAC address to locate a device from outside of its local network. The hardware configuration is: The router is connected to Comcast with a Motorola SB modem.
Comcast assigns a system wide dynamic IP. There is no static IP. On initial setup, a WiFi connection is first established between the thermostat and the router. It is then possible to read or set thermostat values using Total Connect Web pages. Does anyone understand how this works with Total Connect? This post was extremely helpful, thanks itdownsouth: I used show interface to find MAC addresses on our switches reason for this is poor network documentation and mis-labeled switchports and wall jacks Tedious, but found 5 or 6 now seeing hexadecimal thoughts now though By the way, the reason this is working great for me is the lack of routers -- all switches, so if you have only one subnet like we do, this will do -- otherwise, you will probably need to login to the router or switch on the other side of the router to find MAC address tables on the other networks.
You may not be able to see them all on the local host, as far as arp -a on the local host, but looking up the arp or hosts tables on switches and routers could be a possible solution for those with multiple subnets. Use SuperScan to do a bulk ping of the entire network range. SuperScan 3 I recommend is a free tool by McAfee.
It should be able to find most devices on the network. You can specify the range to scan and scan across subnets. I won't try to share all the features because quite frankly I don't know them all. I can tell you exactly how I designed it. It's actually quite simple. Nothing is sent back to the unit. The unit is allowed access to the Internet via your setup and the router.
As long as the unit has permission to make an outbound connection it will work. What happens is the unit makes a report to the server. If it needs to make a request then it gives the server a unique key. The server puts any needed data in an xml readable and the thermostat or quite a few other devices hits that URL a few seconds later the device told the server where it would pick up that info.
All your device needs is a simple read-only connection to the outside world. No need to download anything. Roland's Google Profile. This site uses Akismet to reduce spam.
Find an ip address from a known mac address
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