Can you please be more specific what exactly happens here?
$ cat /proc/sys/net/ipv4/conf/tun0/forwarding
1
$ sudo systemctl start systemd-networkd
$ cat /proc/sys/net/ipv4/conf/tun0/forwarding
1
Is that the setting you mean? How to reproduce the disabling of
forwarding? Apparently it's more than just "start networkd" (I don't
have any actual *.network config on this machine). Or do you mean "all
interfaces that have a config for networkd" instead of "all interfaces"?
It seems reasonable that networkd puts the devices it configures itself
into a defined state. You wouldn't use it to manage tun0 for LXC, as LXC
itself already sets that up?
** Changed in: systemd (Ubuntu)
Status: New => Incomplete
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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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