So, that being said, is it possible to manually send a rarp request? Sort of a arp based ping? 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. 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.
DoIT Help Desk Knowledgebase
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.
Locate an IP address using these easy steps
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.
Find a IP with the MAC address (reverse Lookup)
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.
Windows XP - Finding the IP Number and MAC Address of a Network Card
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. Virtual adapters like those used with virtual private networks generally show a private IP address rather than an actual internet address. Virtual adapters also possess software-emulated MAC addresses and not the actual physical address of the network interface card.
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