Hello, On Fri, Oct 05, 2018 at 07:29:47PM +0000, Leroy Tennison wrote:
> I did a recursive grep of /etc for it's first two octets and found > nothing. In fact /etc/rc.local has the default contents and neither > /etc/network/interfaces or the file in /etc/network/interfaces.d even > configures eth9. > Where else can I look for the remnnts of the "5" configuration which are > being applied at boot and preventing parts of the file-based configuration > from working? I even decompressed a copy of initrd.img... and found > nothing. There are several ways to configure a network interface under Ubuntu. The most common way is probably the package ifupdown, which reads the contents of /etc/network/interfaces and /etc/network/interfaces.d/*. A (more or less) drop-in replacement is ifupdown2, written by the maintainers of the Cumulus Linux distribution for network devices. It uses the same config files as above. If you run a desktop system, you have most likely the NetworkManager installed. NM likes to grab any interface not configured by ifupdown, and applies its default configuration on it, which is running a DHCP client on wired devices. You can check with "nmcli device", which of your devices are controlled by NM. Another less popular graphical tool for network configuration is WICD. It is typically installed with lightweight desktop environments like Xfce or LXDE. Systemd also has the ability to configure network interfaces. Static configuration lies in /etc/systemd/network, dynamic (volatile) config under /run/systemd/network, and default configurations under /lib/systemd/network. See "man systemd-networkd" for details. Newer versions of Ubuntu ship with Netplan, a network configuration utility with its config files under /etc/netplan. Netplan is in an early stage of development, lacking important features like IPv6 privacy extensions. If you use it, I'd consider replacing it by ifupdown, ifupdown2, or systemd-networkd. I'm sure this list is incomplete. However, those are the most popular network configuration options. Best regards, Harald -- ubuntu-server mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-server More info: https://wiki.ubuntu.com/ServerTeam
