librenms-librenms/html/pages/device/graphs/ipSytemStats.inc.php

<?php

if (is_file($config['rrd_dir'].'/'.$device['hostname'].'/ipSystemStats-ipv6.rrd')) {
    $graph_title = 'IPv6 IP Packet Statistics';
    $graph_type  = 'device_ipSystemStats_v6';

    include 'includes/print-device-graph.php';

    $graph_title = 'IPv6 IP Fragmentation Statistics';
    $graph_type  = 'device_ipSystemStats_v6_frag';

    include 'includes/print-device-graph.php';
}

if (is_file($config['rrd_dir'].'/'.$device['hostname'].'/ipSystemStats-ipv4.rrd')) {
    $graph_title = 'IPv4 IP Packet Statistics';
    $graph_type  = 'device_ipSystemStats_v4';

    include 'includes/print-device-graph.php';
}