Some systems list their onboard NIC's MAC in the BIOS. A few ones may even have it printed on the board or a sticker with the MAC somewhere close to the NIC's port. Or get a permit to unplug its disk(s) before booting an OpenBSD CD, then drop to a shell and run ifconfig.
If the MAC was spoofed but the system was connected to a managed switch the switch may still have the MAC from when it powered on cached. If your worried about spoofed MACs you may also want to look into the feature called port security (at least on Juniper and Cisco devices) on your access switches. Which causes interesting problems with VMs bridged to the hosts NIC, btw ; ) Regards, Florian Am 23. Juni 2017 07:40:42 MESZ schrieb Indunil Jayasooriya <induni...@gmail.com>: >> >> > no idea what to do? >> >> Plug it back in. Power it up. >> Make sure it has a reachable IP. >> Ping it. >> > > very sorry. It is prohibited to plug it back in and power it up. > >To do it, We might need a special request. > >Theo, Anyway, thanks for you support.
