@stefanu Check this thread https://community.onion.io/topic/4006/contradiction-in-omega2-device-mac-address-allocation?_=1674999572377

@György-Farkas I did mention it previously: @Lazar-Demin said in Contradiction in Omega2 Device MAC Address Allocation: Earlier in the production lifetime of the Omega2 we used to write the MAC addresses like what you're seeing: But I had to confirm the timing of the change There's no advantages to one schema or the other. Remember that both schemas will work just fine. We just chose to standardize to the one mentioned in the docs article.

@an-arshadali the MAC address is not changing, there's just different MAC addresses for the 3 different network interfaces (WiFi AP, WiFi client, and ethernet). So each Omega2 device is allocated 3 sequential MAC addresses at manufacturing. See more details in the blog post on this topic and in the App Note on MAC Addresses & Unique IDs.

@Robert-Bennett Solved by re-flashing by putting the omega2p image on a 4GB USB memory stick and re-flashing. After flashing was complete, powered off, removed USB memory stick, powered on - and the last 4 digits of the MAC address on the sticker appeared in the WiFi network device list (where after the previous re-flashing the digits were 0000).

@Daniel-Bachmann Yes, the MAC must be (and is) globally unique. However note that you should take the entire MAC into account, not only the last 16 bits (4 hex digits). As you calculated, 16 bits allow only for 65536 different MAC addresses, and every Omega2 needs at least 2 of them, one for the WiFi and one for the Ethernet. So Onion will (or already has) run out of this range. Onion currently got the MAC addresses 40:A3:6B:Cx:xx:xx assigned from the global MAC pool (see here for a quite complete list), which is a total of 16*65536 = 1048576 addresses. Should be enough for a while, but still, Onion might obtain another range at some point in time. So as a really stable software ID, I would only use the complete MAC. You can get the MAC by looking at ifconfig (or ip link) command line tool output, or using C/C++ code like the one I'm using for that purpose (macaddress.hpp/macaddress.cpp). Note also that only universally administered addresses (UAAs) are unique, where locally administered addresses (LAAs) are not. The difference is in bit1 in the first byte, if it is 1, then the address is not globally unique. All MACs actually exposed to a network must be unique, but internal ones might be not. Onion addresses starting with 40 are unique, of course. But if you have IPv6 on, you see that a LAA is used to build the IPv6 link local address (starts with 42). More details -> wikipedia

@Bartosz-Grabias there is a mention of that issue in a post in this thread by Lazar [4th post of thread] https://community.onion.io/topic/2809/new-os-release

Ok, quite simple actually : ) @omega-ABCD.local/console open Editor, navigate to /etc/config and edit dhcp file. At the end of the file, add the following: config host option name 'name of your host' option ip 'XXX.XXX.X.X' // address ip you want to assign this device. option mac 'XX:XX:XX:XX:XX:XX' // // mac address this device. you can add as many as you want. Thanks for your help! Cheers Steph

Thanks @Maximilian-Gerhardt I just changed "br-wlan" to "ra0" as this interface has a MAC value consistent with the sticker.

@Chuck-Malloch This is a duplicate post! More details here: https://community.onion.io/topic/1123/mac-address-on-the-onion-is-wrong/5

@JC-LAWSON said in MAC address on the Onion is WRONG!: It looks like the label 40 would be intended and the product 42 would be wrong. Both are intended, neither is "wrong". As already explained back in February a few posts up this page, the address with the "2" in the most significant octet has the locally administered bit set, so you won't find that in OUI tables since it is in a reserved range. This address is derived from the other address by a set of rules than include setting this bit. After all the chip has two interfaces, you wouldn't want them to both have the same address. If you don't like the derived address, grab the raw one instead or change the startup scripts to alter which interface gets which address. Do remember that MAC addresses are easily spoofed.

@Luciano-S. Thank you! Yes, that's exactly what i want to do

@Al Thanks! We'll write a NodeBB plugin to integrate them into the system.

The MAC on my Onion2+ begins with 42:a3:6b:00 instead of 40:a3:6b:c0 as on both the box and device stickers.