Hi, > On Mon, 11 Oct 2021, José María Terry Jiménez wrote: > >> El 11/10/21 a las 13:00, Tom Yates escribió: >>> On Mon, 11 Oct 2021, José María Terry Jiménez wrote: >>> >>>> Hello >>>> >>>> Perhaps the solution is this: >>>> >>>> https://access.redhat.com/solutions/70215HWADDR= >>> >>> thanks, but either that link is broken, or the site requires a login, >>> as i >>> can't see anything and get redirected to a general search page. could >>> i >>> trouble you to check the link? >>> >>> >> Uh oh! Some copypaste at the end >> >> Is this one >> >> https://access.redhat.com/solutions/70215 > > thank you very much for the suggestion! sadly, this has not worked. > Are you even sure it's NetworkManager messing with your MAC addresses? I have no idea why NM should ever mess with MAC addresses on a server and I don't expect NM is doing so. I have another idea: Seems this is on a SuperMicro server, can it be that the box in question has a shared lights out management, sharing the management ethernet port with the first LAN port? If so, can it be that the management port is not configured properly and does try to DHCP an IPv4 address? If you don't need the management stuff then you may try to simply disable it to get rid of the mess. Regards, Simon