Netplan generates configuration snippets to make sure an interface is
only handled by the backend renderer (networking-daemon: sd-networkd or
NetworkManager) that is instructed to control that interface nowadays.
This logic has been improved recently:
https://github.com/canonical/netplan/pull/276
Please re-open if this is still an issue.
** Changed in: nplan (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1713226
Title:
systemd-networkd messes up networking
Status in ifupdown package in Ubuntu:
Confirmed
Status in network-manager package in Ubuntu:
Confirmed
Status in nplan package in Ubuntu:
Won't Fix
Status in systemd package in Ubuntu:
Won't Fix
Bug description:
Since systemd-234-2ubuntu8 systemd-networkd is enabled by default.
This causes problems existing configurations
ex1: if the network has ipv6 enables (the host recieves a router
advertisement), networkmanager does not configure the network anymore so you
get only ipv6 and no ipv4 connections (since systemd-networkd seems to bring
only the link up)
ex2: if you use systemd-nspawn and configured static ip addresses in
/etc/network/interfaces, systemd-networkd adds a dhcp obtained address
on the host0 adapter and a 169.254 address
For the average user both is not expected, so my solution was
systemctl disable systemd-networkd, but since you seem to insist
having this enabled, it must be made sure systemd-networkd does not
touch existing configurations.
My suggestion is:
1) if /etc/network/interfaces contains anything other than lo -> do not
enable systemd-networkd
2) if network-manager is enabled, systemd-networkd must be disabled and vice
versa
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