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

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https://bugs.launchpad.net/bugs/1500992

Title:
  networkd: Don't reset forwarding unless told to do so in config

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