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)  Beginning with Shorerwall 5.0.7, calling the 'shorewall' function
    from embedded Perl results in a syntax error.

    Workaround: Preface your embedded Perl with:

        use Shorewall::Config(shorewall);

    Example:

    ?BEGIN PERL
    use Shorewall::Config(shorewall);
    my $i_count = 1;
    foreach my $iface (qw/lan1 lan2 lan3 lan4/) {
        # rules:   ACTION           CHAIN   SOURCE    DESTINATION
     	shorewall("acct_in_$i_count -       $iface    -");
        $i_count++;
    }
    1;
    ?END PERL