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Convert mac address to ip cmd3/15/2024 The technology called ARP - Address Resolution Protocol included with TCP/IP makes it possible. However, computers connected to the same TCP/IP local network can determine each other's MAC addresses from IP address. Simply stated, a computer's own hardware configuration determines its MAC address while the configuration of the network it is connected to determines its IP address. These two addresses originate from different sources. It is usually not possible for a person to translate IP address to MAC address alone. In some situations you may want to get MAC address from IP address. A computer's assigned IP address changes over time, but the MAC address of the computer hardware is fixed. Learn from my mistakes, DOCUMENT EVERYTHING.TCP/IP networks use both the IP addresses and MAC addresses of connected computers. That’s it, now you can use the web interface of the NMC to make configuration changes or retrieve information from the UPS unit.Īll of this could have been avoided had I simply taken 30 minutes to configure the UPS when I installed it, or even taken 5 minutes to document the MAC and put all of the paperwork that came with the UPS in a folder in my file cabinet. Now, you can Telnet to the card by typing: telnet Use one of the following Ping commands (To clarify, the -l option is the letter L but must be lowercase when executing the command): Next, use Ping with a size of 113 bytes to assign the IP address defined by the ARP command. Open up a command prompt and type the following ( MAC Address format: xx-xx-xx-xx-xx-xx):Īrp -s Now we just need a computer on the same subnet. If you feel like taking your life in your own hands, you could just unscrew the NMC and pull it out of the UPS without taking the UPS offline. Now I DO NOT recommend that you do this, but it is possible to remove the NMC with the UP running. The MAC address is located on the quality assurance slip that shipped with the NMC, and is also located on a white sticker on the NMC itself.Unfortunately the QA slip is long gone, and the sticker on the NMC with the MAC printed on it is on once of the actual circuit boards of the NMC, now safely concealed inside the UPS. All we need is the MAC address of the NMC. Enter the ARP command.Īddress resolution protocol (ARP) can be used to configure the NMC. So I plugged the NMC into one of the switches, and… nothing.Īs it turns out, the NMC in this particular unit will not pull a DHCP lease without intervention through some APC software that ships with the unit. This got me thinking about the UPS on the servers. Until I needed to get access to a UPS in the other building. I’m not going to make excuses, it was just one of those things where I got busy and forgot. I bought this unit with a Network Management Card so that I could remotely monitor the unit. This unit will handle all of our current servers, with about 30% extra capacity for expansion. Enter the APC SmartUPS RT 5000 with two battery arrays. So clearly my first priority was to get the servers on a UPS that was correctly sized for the draw, with fresh batteries. Approximately 1/1000000000 of a second before the UPS batteries on the servers and the few workstations on building UPS circuits ran out. This meant that if the power failed (which is does, because this is an older part of town), most of the workstations would go down, and the generator would kick on. Unconnected in any way to any of the servers. That were at approximately 150% of draw capacity (when all servers were at peak draw). Desk units that were housed on shelves in the rack. With batteries that had never been replaced. That circuit was for the 17 year old Toshiba PBX that was mounted (I kid you not) in a cupboard in the bathroom in that building. That building is on the generator, but there is only one circuit that is on the UPS. Only some outlets are on the UPS circuits. The UPS battery had never been replaced when I got here (it basically had a runtime measured in microseconds). We do have a generator, and we do have a building UPS in the main building. Much like most IT Professionals home networks are kinda messy, working for a company full of electricians translates to wiring… issues. When I took this job I though that would translate into having little things like plenty of power in the server room, well documented wiring, and maybe having everything in the building(s) on UPS units. I work for a company that does Electrical construction and design.
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