[Bug 1713226] Re: systemd-networkd messes up networking

[msaxl]

Here are the files of the networkmanager systemd-networkd conflict (I
already removed ifupdown, the problem is the same, so we say for sure
networkmanager or systemd-networkd causes the problem)

the output of ip a is the following:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:1d:7d:c3:a3:a1 brd ff:ff:ff:ff:ff:ff
    inet6 fd12:2017:8387:0:8d6:b5ff:bf63:6389/64 scope global mngtmpaddr noprefixroute dynamic 
       valid_lft 86396sec preferred_lft 14396sec
    inet6 fd12:2017:8387:0:21d:7dff:fec3:a3a1/64 scope global mngtmpaddr noprefixroute dynamic 
       valid_lft 86304sec preferred_lft 14304sec
    inet6 fe80::21d:7dff:fec3:a3a1/64 scope link                                                                                                                                                               
       valid_lft forever preferred_lft forever

the profile that should come up has addr-gen-mode=stable-privacy, so
somehow it adds another ipv6 address, but it totally ignores ipv4...

** Attachment added: "files.tar.xz"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1713226/+attachment/4941430/+files/files.tar.xz

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https://bugs.launchpad.net/bugs/1713226

Title:
  systemd-networkd messes up networking

Status in ifupdown package in Ubuntu:
  New
Status in network-manager package in Ubuntu:
  New
Status in nplan package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

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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