Ah, thanks for confirming. This indeed applies to interfaces which networkd configures; man systemd.network documents this quite clearly.
> Having the bridge setup tool, modify the configuration of all potential outgoing interface to allow forwarding seems completely wrong to me Full ack. Such scripts should not touch the configuration of interfaces that they didn't set up. This is unexpected, leads to race conditions, and isn't reliable as you wrote. Setting to wishlist for now as it's currently behaving as documented. I'll raise this upstream and see if they are willing to change the default to "kernel". ** Changed in: systemd (Ubuntu) Status: Incomplete => Triaged ** Changed in: systemd (Ubuntu) Importance: Undecided => Wishlist -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1500992 Title: networkd: Don't reset forwarding unless told to do so in config To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1500992/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs