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-- 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/1850704 Title: networkd doesn't set MTUBytes if interface is already up Status in systemd: Fix Released Status in systemd package in Ubuntu: Fix Released Status in systemd source package in Bionic: Fix Released Bug description: [impact] if a networkd .network file specifies a [Link] section with MTUBytes=XXX set, networkd will only apply that mtu if the interface is down when networkd starts; if the interface is already up, the mtu won't be applied. [test case] on a bionic system, create a .network file like: [Match] Name=ens8 [Link] MTUBytes=6666 then, reboot. The interface should be set correctly with that mtu: $ ip l show ens8 3: ens8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 6666 qdisc fq_codel state UP mode DEFAULT group default qlen 1000 link/ether 52:54:00:30:4c:1e brd ff:ff:ff:ff:ff:ff now, manually change the interface back to 1500 mtu, and restart networkd, then recheck the mtu: $ ip l show ens8 3: ens8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 6666 qdisc fq_codel state UP mode DEFAULT group default qlen 1000 link/ether 52:54:00:30:4c:1e brd ff:ff:ff:ff:ff:ff $ sudo ip l set mtu 1500 dev ens8 $ ip l show ens8 3: ens8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000 link/ether 52:54:00:30:4c:1e brd ff:ff:ff:ff:ff:ff $ sudo systemctl restart systemd-networkd $ ip l show ens8 3: ens8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000 link/ether 52:54:00:30:4c:1e brd ff:ff:ff:ff:ff:ff [regression potential] low, but any regression would likely involve failure to correctly set the configured mtu. this is needed only in bionic, it's fixed in disco and later already. To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1850704/+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