Public bug reported:
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.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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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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