@ddstreet It seems to work as expected in Eoan! netplan.io 0.98-0ubuntu1 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1836695
Title: systemd fails to setup static routes at boot when using DHCP Status in netplan: Invalid Status in systemd package in Ubuntu: Fix Released Status in systemd source package in Bionic: In Progress Status in systemd source package in Disco: In Progress Status in systemd source package in Eoan: Fix Released Bug description: [impact] a systemd-networkd configuration that uses ipv4 dhcp but ignores the dhcp-provided route, and instead sets up a static route, and also does not include a static ipv4 address, fails to actually create the static route. This is due to networkd attempting to set up the static route before the dhcp ipv4 address is assigned, and the kernel does not allow creation of the route before setting up corresponding ipv4 address. this results in a network that does have the dhcp-provided ipv4 address, but is missing both its dhcp-provided route (because networkd is configured to ignore it) and the static route (because networkd was not able to create it). [test case] (remove or unconfigure netplan, so it will not conflict with this manual networkd configuration) create a networkd config file, e.g.: $ cat /etc/systemd/network/10-eth0.network [Match] Name=eth0 [Network] DHCP=ipv4 [Route] Destination=10.0.0.0/8 Gateway=10.202.51.1 [DHCP] UseRoutes=false then *reboot* the system, and check that the static route was not applied: $ ip r 10.202.51.0/24 dev eth0 proto kernel scope link src 10.202.51.254 note that because networkd does not remove ipv4 addresses that it manages (including dhcpv4 addresses), restarting networkd after the initial boot will correctly create the static route, e.g.: ubuntu@lp1836695-b:~$ ip r 10.202.51.0/24 dev eth0 proto kernel scope link src 10.202.51.254 ubuntu@lp1836695-b:~$ sudo systemctl restart systemd-networkd ubuntu@lp1836695-b:~$ ip r 10.0.0.0/8 via 10.202.51.1 dev eth0 proto static 10.202.51.0/24 dev eth0 proto kernel scope link src 10.202.51.254 [regression potential] adjusting how networkd works always carries the risk of breaking networking. TBD detailed regression potential after analyzing fix. [other info] original description: -- Consider the following setup: network: version: 2 renderer: networkd ethernets: ens4: dhcp-identifier: mac dhcp4: yes dhcp4-overrides: use-dns: no use-ntp: no send-hostname: no use-hostname: no use-routes: no routes: - to: 10.0.0.0/8 via: 10.50.0.1 optional: true Thus I only need to get the IP address by DHCP, then add some static routes. This setup doesn't work. Apparently `routes` keyword only works when using static addresses. To manage notifications about this bug go to: https://bugs.launchpad.net/netplan/+bug/1836695/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
