On Mon, May 26, 2025 at 20:46:37 -0700, accipiter wrote: > On 5/26/25 6:20 PM, Charles Curley wrote: > > On Mon, 26 May 2025 12:20:22 -0700 > > accipiter <pedicula...@mail.com> wrote: > > > > > it showed not 1 but 2 entries for eth0 - though with different UUIDs. > > > > If you are using Network Manager, you should not have anything else > > setting up interfaces that NM manages for you. What did you use for the > > purpose in the past? > > > In the past it was the old standard /etc/network/interfaces setup. I had > commented-out all the lines associated with 'eth0', but it's possible > there's something that I haven't adequately killed off. Is > there some way to ensure that's thoroughly dead without messing up > NetworkManager?
If you're using DHCP (most people are), there will be a DHCP client daemon started when the interface is brought up. If you commented out the lines in the file *before* bringing the interface down, then the daemon is left running, and ifupdown doesn't know about it, since the lines that would have told it "hey, there's a daemon you need to manage" have been commented out. In that situation, you'll need to find the daemon and kill it. Rebooting would also take care of that, of course.
