** Description changed: [Impact] Users cannot create IPv6 routes that specify PreferredSource. This means that users cannot specify a number of valid IPv6 routes that are useful in some circumstances. These routes can be created with the 'ip' tool, just not with systemd. This was reported upstream in systemd issue #5882 is fixed by pulling in the changes in systemd PR #11375 - https://github.com/systemd/systemd/pull/11375 [Test Case] Start a Bionic or Cosmic VM. Add the following netplan yaml (adjust for ethernet card and MAC): network: version: 2 ethernets: ens3: dhcp4: true match: macaddress: 52:54:00:e2:c2:d7 set-name: ens3 addresses: ["fd8f:1d7d:b141::2/64", "fd8f:1d7d:b141::200/64"] routes: - to: "a::/16" via: "fd8f:1d7d:b141::1" from: "fd8f:1d7d:b141::2" - to: "fd8f:1d7d:b141::/64" scope: link from: "fd8f:1d7d:b141::2" metric: 255 Run netplan apply or reboot. Wait ~10s. + Alternately, to test without netplan, configure systemd-networkd with: + + [Match] + Name=ens3 + + [Network] + DHCP=ipv4 + LinkLocalAddressing=ipv6 + Address=fd8f:1d7d:b141::2/64 + Address=fd8f:1d7d:b141::200/64 + + [Route] + Destination=a::/16 + Gateway=fd8f:1d7d:b141::1 + PreferredSource=fd8f:1d7d:b141::2 + + [Route] + Destination=fd8f:1d7d:b141::/64 + PreferredSource=fd8f:1d7d:b141::2 + Scope=link + Metric=255 + + [DHCP] + UseMTU=true + RouteMetric=100 + + Currently, ip -6 route will not include a route to "a::/16", and will not include the route to "fd8f:1d7d:b141::/64" that has "fd8f:1d7d:b141::2" as the source address - both those addresses will be missing. Correct behaviour is for ip -6 route to report the following: ubuntu@b-np:~$ ip -6 route a::/16 via fd8f:1d7d:b141::1 dev ens3 proto static src fd8f:1d7d:b141::2 metric 1024 pref medium fd8f:1d7d:b141::/64 dev ens3 proto static src fd8f:1d7d:b141::2 metric 255 pref medium fd8f:1d7d:b141::/64 dev ens3 proto kernel metric 256 pref medium fe80::/64 dev ens3 proto kernel metric 256 pref medium Check before and after upgrade that 'systemctl status network- online.target' shows that the target has been reached. [Regression Potential] This changes the state machine in systemd which configures the links. It passes systemd's internal tests, and has been approved by systemd maintainers, but it remains possible that the changes will break the configuration of obscure network setups. The backport requires pulling in two further commits that also change behaviour: currently systemd deletes all addresses and routes that were attached to an interface. With this change, it will only delete those that are not specified in the configuration files. A side effect of this is that restarting networkd will not cause remove/add netlink events to be emitted for these addresses, so if anyone is relying on this behavior this will break compatibility; but that is an unlikely thing to be relying on, and it seems worth this risk to reduce unnecessary network state changes.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1812760 Title: networkd: [Route] PreferredSource not working in *.network files To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1812760/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
