Re: [gentoo-user] Mystically disabled Ethernet connection

[gevisz <gevisz@gmail.com>]

пт, 18 дек. 2020 г. в 18:26, bobwxc <bobwxc@88.com>:
>
> 在 2020/12/19 上午1:29, gevisz 写道:
> > I am currently installing a new Gentoo system
> > on a computer that is run by a Gentoo system
> > that has not been updated since January 2019.
> >
> > Initially, I did so by chrooting to a newly formatted
> > disk partition. My intention was to build everything
> > in the chrooted environment and only then start
> > to work in the new Gentoo system.
> >
> > However, when after installing Grub I rebooted into
> > the new Gentoo system to find out if it works and
> > rebooted again into the old Gentoo system to continue
> > compilation in the chroot environment, I found out
> > that my computer does not have a working ethernet
> > connection to my home router. The "ip addr" command
> > showed that my ethernet interface is down.
> >
> > I tried "ip link set <eth0> up" and "ifconfig <eth0> up"
> > commands, where <eth0> substitutes the correct,
> > "predictable," name of my ethernet interface but it
> > had not helped.
> >
> > Initially, I thought that something was wrong with my
> > hardware, but when I rebooted into my new Gentoo
> > system, the ethernet interface started to work again.
> > Then, I rebooted back to the old system, and
> > the ethernet interface stopped working again.
> >
> > It is very strange because I am sure that I have not
> > changed anything on my old Gentoo system except
> > for installing a new Grub onto the system disk.
> >
> > So, I have tried to reinstall (the old) Grub from
> > my old system, but it has not helped either.
> >
> > Finally, I decided that it would be easier to complete
> > installation of the new Gentoo system than to find out
> > what is wrong with the old Gentoo system ethernet
> > connection. So, I compiled xorg-x11, awesome, gvim,
> > xfce4-terminal and are currently compiling firefox.
> >
> > Hopefully, tomorrow I will already have my new Gentoo
> > system working.
> >
> > However, I am still wondering why the ethernet interface
> > stopped working on my old Gentoo system.
> >
> > As, I have already said, I am pretty sure that I have not
> > changed anything in its settings. Moreover, I have looked
> > through the entire /etc directory of my old Gentoo system
> > for config files that were modified during the installation
> > of the new Gentoo system (suspecting that instead of the
> > chrooted environment I put an installation command into
> > the su terminal of my old Gentoo system or mistakenly
> > edited a configuration file of my old Gentoo system) but
> > found no config file that was modified during this period of time.
> >
> > So, I am not in a desperate need for help, but just interested
> > to find out the reason for such a strange behaviour of the
> > ethernet interface.
> >
> > P.S. I have read in the Gentoo Network management wiki
> > that the connman, netifrc, dhcpcd, networkmanager, and
> > openrc should not be run at the same time because it could
> > lead to "unpredictable results" and checked if it is not
> > the case on my old Gentoo system. No, on my old Gentoo
> > system installed is only the openrc with the netifrc use flag
> > and netifrc (which, as I guess, leads to only netifrc being used).
> > But, anyway, it has been worked so for years and only
> > now suddenly stopped.
>
> That is interesting. Something must been changed here.
> Do you use some partitions for both gentoo systems?
> Not the root, just like boot ESP partition or home.

Yes, I mount the same home partition (actually the separate disk) on both.
And it still has some configuration files from a pre-Gentoo era :)
as it has been used for Ubuntu 10 years ago.

A separate partition with rarely used virtual machines is also mounted
into a user directory. Also a common swap. ESP partition also exists
but I never mounted it on old Gentoo and recently disabled it from
mounting into a new one as well (after realized that it is not needed at all :).