How can I find a MAC of hardware attached via ethernet cable? Share on Facebook Post on reddit Tweet on Twitter Share on LinkedIn Home › Forums › Networking › General Networking › How can I find a MAC of hardware attached via ethernet cable? This topic has 15 replies, 7 voices, and was last updated 9 years, 9 months ago by vassago10. Viewing 1 post (of 1 total) Author Posts TonyGMember Apr 19, 2011 at 5:48 am #154292 Hi guys I have been working nicely with an industrial scanner that is controlled by a Linux PC via an ethernet cable, but the hard drive has died I need to get it working again. The problem is that the main PCB has a Realtek RTL8019AS ethernet controller chip, which I believe is used in the most basic way possible, applied straight off-the-shelf and unconfigured. To utilise the controller ARP commands are used to assign an IP address to the chip’s MAC address e.g. something like: arp -s 192.168.2.5 00-05-a4-00-a8-f8 Unfortunately the actual MAC address was lost along with the HD :-( Any ideas how I might find the MAC address again? The only thing I could have a reasonable guess at is that the chip will have a default subnet of 255.255.0.0 or 255.255.255.0 Fingers crossed and many thanks in advance. Tony Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.