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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1713226 Title: systemd-networkd messes up networking To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1713226/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs