It is much simpler to just set
/proc/sys/net/ipv{4,6}/conf/all/forwarding to 1, as that updates all
conf/iface/forwarding and /proc/sys/net/ipv4/ip_forward. I. e. we just
need

for f in /proc/sys/net/ipv*/conf/all/forwarding; do
    echo 1 > $f
done

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

Title:
  Provide script to enable IP forwarding

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