1)  On systems running Upstart, shorewall-init cannot reliably secure
    the firewall before interfaces are brought up.

2)  The 'enable', 'reenable' and 'disable' commands do not work
    correctly in configurations with USE_DEFAULT_RT=No and optional
    providers listed in the DUPLICATE column.

3)  Shorewall6-lite fails to start under systemd.

    Workaround:

    - Edit /lib/systemd/system/shorewall6-lite.service and correct
           the ExecStart line:

           "/sbin/shorewal" should be "/sbin/shorewall"

    - Run "systemctl daemon-reload"

    Will be corrected in 5.1.0.1