protocol kernel {
    scan time 20;
    kernel table 102;
    ipv4 {
        table inet4;
        import none;
        export filter {
            if source = RTS_STATIC then reject;
            if !is_bogon_prefix() then {
                krt_prefsrc = LOCAL_V4_kernel;
                accept;
            }
            reject;
        };
    };
};