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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

This approach doesn't work after all, see 
https://github.com/systemd/systemd/issues/1411#issuecomment-144975442

So changing back to the original title.

** Summary changed:

- Provide script to enable IP forwarding
+ networkd: Don't reset forwarding unless told to do so in config

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

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

Status in systemd package in Ubuntu:
  In Progress

Bug description:
  It's been reported by several LXC users that systemd-networkd will
  turn off per-interface forwarding for all network interfaces when it
  starts.

  Presumably upstream expects users to go and manually edit their config
  to allow it when needed.

  This breaks LXC, libvirt, ... anything which ships a bridge that then
  NAT or route outgoing traffic. Requiring the user to do the config
  change would be a massive regression in user friendliness and having
  lxc, libvirt, ... do it for the user would be a policy violation.

  As a result, I'd recommend we patch systemd to not interfere with
  forwarding unless explicitly configured by the user. This will allow
  all our existing scripts to keep setting things up themselves and have
  it all run fine.

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