I've had to temporarily move to other things and need to wait before responding fully. Haven't installed anything unusual so I highly doubt ifupdown2or WICD is in use. This is a server, not desktop so I hope network manager is not used (but will double check). This is 16.04 so netplan is similarly out-of-scope. I did do some looking around in the systemd "world" and didn't find anything, will check again.
Leroy Tennison Network Information/Cyber Security Specialist E: [email protected] 2220 Bush Dr McKinney, Texas 75070 www.datavoiceint.com TThis message has been sent on behalf of a company that is part of the Harris Operating Group of Constellation Software Inc. These companies are listed here . If you prefer not to be contacted by Harris Operating Group please notify us . This message is intended exclusively for the individual or entity to which it is addressed. This communication may contain information that is proprietary, privileged or confidential or otherwise legally exempt from disclosure. If you are not the named addressee, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this message in error, please notify the sender immediately by e-mail and delete all copies of the message. ________________________________________ From: ubuntu-server <[email protected]> on behalf of Harald Weidner <[email protected]> Sent: Monday, October 8, 2018 6:29 PM To: [email protected] Subject: [EXTERNAL] Re: Where is network configuration "hidden" on Ubuntu 16.04? 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 -- ubuntu-server mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-server More info: https://wiki.ubuntu.com/ServerTeam
