diff --git a/sysutils/pfSense-pkg-RRD_Summary/Makefile b/sysutils/pfSense-pkg-RRD_Summary/Makefile
index ee8b16d76121..8a4ea9bfc58e 100644
--- a/sysutils/pfSense-pkg-RRD_Summary/Makefile
+++ b/sysutils/pfSense-pkg-RRD_Summary/Makefile
@@ -1,8 +1,7 @@
 # $FreeBSD$
 
 PORTNAME=	pfSense-pkg-RRD_Summary
-PORTVERSION=	1.3.2
-PORTREVISION=	2
+PORTVERSION=	2.0
 CATEGORIES=	sysutils
 MASTER_SITES=	# empty
 DISTFILES=	# empty
diff --git a/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/pkg/rrd-summary.xml b/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/pkg/rrd-summary.xml
index 33c5744ba6cf..c12cc9927620 100644
--- a/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/pkg/rrd-summary.xml
+++ b/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/pkg/rrd-summary.xml
@@ -30,7 +30,7 @@
 	<title>Status: RRD Summary</title>
 	<menu>
 		<name>RRD Summary</name>
-		<tooltiptext>Display total amount of traffic passed In/Out during this and the previous month.</tooltiptext>
+		<tooltiptext>Estimated month-over-month traffic passed In/Out during the specified period.</tooltiptext>
 		<section>Status</section>
 		<url>/status_rrd_summary.php</url>
 	</menu>
diff --git a/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/share/pfSense-pkg-RRD_Summary/info.xml b/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/share/pfSense-pkg-RRD_Summary/info.xml
index d96239bf18be..5ed6a0acfd33 100644
--- a/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/share/pfSense-pkg-RRD_Summary/info.xml
+++ b/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/share/pfSense-pkg-RRD_Summary/info.xml
@@ -3,7 +3,7 @@
 	<package>
 		<name>RRD Summary</name>
 		<internal_name>RRD_Summary</internal_name>
-		<descr><![CDATA[RRD Summary Page, which will give a total amount of traffic passed In/Out during this and the previous month.]]></descr>
+		<descr><![CDATA[RRD Summary Page, which will give estimated month-over-month traffic passed In/Out during the specified period.]]></descr>
 		<version>%%PKGVERSION%%</version>
 		<configurationfile>rrd-summary.xml</configurationfile>
 	</package>
diff --git a/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/www/status_rrd_summary.php b/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/www/status_rrd_summary.php
index 39ad4c86a951..5cb55762a4bd 100644
--- a/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/www/status_rrd_summary.php
+++ b/sysutils/pfSense-pkg-RRD_Summary/files/usr/local/www/status_rrd_summary.php
@@ -20,40 +20,87 @@
  */
 require_once("guiconfig.inc");
 
-$rrds = glob("/var/db/rrd/*-traffic.rrd");
-$startday = isset($_POST['startday']) ? $_POST['startday'] : "01";
-$rrd = isset($_POST['rrd']) ? $_POST['rrd'] : "wan-traffic.rrd";
-
-$start = "00 " . date("m/{$startday}/Y");
-$lastmonthstart = "00 " . date("m/d/Y", strtotime("-1 month", strtotime(date("m/{$startday}/Y"))));
-$lastmonthend = "00 " . date("m/d/Y", strtotime("-1 second", strtotime(date("m/{$startday}/Y"))));
-
-$thismonth = fetch_rrd_summary($rrd, $start, "now");
-$lastmonth = fetch_rrd_summary($rrd, $lastmonthstart, $lastmonthend, 24*60*60);
-
-function fetch_rrd_summary($rrd, $start, $end, $resolution=60*60) {
+// Using too small a divisor for traffic sums will likely exceed PHP_MAX_INT
+$unitlist = array("MiB" => 2, "GiB" => 3, "TiB" => 4, "PiB" => 5);
+
+// validate interface
+$iflist = get_configured_interface_list();
+$interface = filter_input(INPUT_POST, "interface", FILTER_SANITIZE_STRING);
+$interface = in_array($interface, $iflist) ? $interface : "wan";
+
+// get rrd bounds for interface
+$rrd = "{$interface}-traffic.rrd";
+$data = fetch_rrd_summary($rrd, "-10y", "now");
+$firstyear = date("Y", ($data["first"] > 0) ? $data["first"] : time() );
+$lastyear = date("Y", ($data["last"] > 0) ? $data["last"] : time() );
+
+// validate year
+$startyear = filter_input(INPUT_POST, "startyear", FILTER_VALIDATE_INT,
+	array("options" => array("min_range" => 0, "max_range" => $lastyear)) );
+$startyear = ($startyear >= $firstyear || $startyear == "0") ? $startyear : $lastyear;
+// validate startday
+$startday = filter_input(INPUT_POST, "startday", FILTER_VALIDATE_INT,
+	array("options" => array("min_range" => 1, "max_range" => 28)) );
+$startday = ($startday > 0) ? $startday : 1;
+// validate units
+$units = filter_input(INPUT_POST, "units", FILTER_VALIDATE_INT,
+	array("options" => array("min_range" => min(array_values($unitlist)), "max_range" => max(array_values($unitlist)) )) );
+$units = in_array($units, $unitlist) ? $units : $unitlist["GiB"];
+
+// 1:timestamp 2:inpass 3:outpass 4:inblock 5:outblock 6:inpass6 7:outpass6 8:inblock6 9:outblock6
+// total_in = $2 + $4 + $6 + $8; total_out = $3 + $7 (blocked outbound traffic is excluded)
+function fetch_rrd_summary($rrd, $start, $end, $units=2, $resolution=24*60*60) {
 	$traffic = array();
 	$rrd = escapeshellarg("/var/db/rrd/{$rrd}");
 	$start = escapeshellarg($start);
 	$end = escapeshellarg($end);
-	exec("/usr/local/bin/rrdtool fetch {$rrd} AVERAGE -r {$resolution} -s {$start} -e {$end} | grep -v nan | awk '{ sum1 += $2/(1024*1024) + $4/(1024*1024) + $6/(1024*1024) + $8/(1024*1024); sum2 += $3/(1024*1024) + $5/(1024*1024) + $7/(1024*1024) + $9/(1024*1024); } END { printf \"%u|%u\", sum1*{$resolution}, sum2*{$resolution}; }'", $traffic);
-	return explode('|', trim($traffic[0]));
+	exec("/usr/local/bin/rrdtool fetch {$rrd} AVERAGE -r {$resolution} -s {$start} -e {$end}", $traffic);
+	$divisor = 1024 ** $units;
+	$t_keys = preg_split("/\s+/", $traffic[0]);	// grab keys
+	//print "time=$t_first st=$start end=$end div=$divisor res=$resolution";
+	$traffic = preg_grep("/^[0-9]+:/", $traffic);	// select data rows
+	$traffic = preg_grep("/nan/", $traffic, PREG_GREP_INVERT);	// filter nan rows
+	$data = array( "first" => time() );
+	foreach ( $traffic as $t ) {
+		$t = preg_split("/[\s:]+/", $t);
+		if (count($t) != count($t_keys)) continue;	// error: field mismatch
+		$data["first"] = min($t[0], $data["first"]);
+		$data["last"] = max($t[0], $data["last"]);
+		foreach ($t_keys as $i => $k) { $data[$k] += ($t[$i] / $divisor) * $resolution; }
+	}
+	// Adjust for resolution
+	foreach ($t_keys as $k) {
+		if (preg_match("/^outblock/", $k)) continue;
+		$data["total_in"] += preg_match("/^in/", $k) ? $data[$k] : 0;
+		$data["total_out"] += preg_match("/^out/", $k) ? $data[$k] : 0;
+	}
+	return $data;
 }
 
-function print_rrd_summary_table($data) { ?>
-		<div class="table-responsive">
-			<table class="table table-striped table-hover table-condensed" id="rrdsummary">
-				<thead>
-					<tr><th>Direction</th><th>Bandwidth</th></tr>
-				</thead>
-				<tbody>
-					<tr><td>In</td><td align="right"><?=$data[0]; ?> MBytes</td></tr>
-					<tr><td>Out</td><td align="right"><?=$data[1]; ?> MBytes</td></tr>
-					<tr><td>Total</td><td align="right"><?=$data[0] + $data[1]; ?> MBytes</td></tr>
-				</tbody>
-			</table>
-		</div>
-<?php
+function print_rrd_summary($rrd, $units, $startyear, $startday) {
+	$data = fetch_rrd_summary($rrd, "-10y", "now");
+	$first = $data["first"];
+	$last = $data["last"];
+	global $unitlist; $u = array_flip($unitlist);
+	foreach (range(date("Y", $last), date("Y", $first), 1) as $year) {
+		if ($startyear > 0 && $startyear != $year) continue;
+		foreach (range(12, 1, -1) as $month) {
+			$start = strtotime(date("{$month}/{$startday}/{$year}"));
+			$end = strtotime("-1 second", strtotime("+1 month", $start));
+			if ($start > $last || $end < $first) continue;
+			if ($start < $first) $start = $first;
+			if ($end > $last) $end = $last;
+			$data = fetch_rrd_summary($rrd, "epoch+{$start}s", "epoch+{$end}s", $units, 24*60*60);
+			?>
+				<tr>
+					<td><?=date("Y-m-d", $start); ?> to <?=date("m-d-Y", $end); ?></td>
+					<td><?=sprintf("%0.2f %s", $data["total_in"], $u[$units]); ?></td>
+					<td><?=sprintf("%0.2f %s", $data["total_out"], $u[$units]); ?></td>
+					<td><?=sprintf("%0.2f %s", $data["total_in"] + $data["total_out"], $u[$units]); ?></td>
+				</tr>
+			<?php
+	  }
+	}
 }
 
 $pgtitle = array("Status", "RRD Summary");
@@ -64,17 +111,30 @@ function print_rrd_summary_table($data) { ?>
 
 $section = new Form_Section('Select RRD Parameters');
 
-$rrd_options = array();
-foreach ($rrds as $r) {
-	$r = basename($r);
-	$rrd_options[$r] = $r;
+$if_options = array();
+foreach ($iflist as $i) {
+	$if_options[$i] = $i;
 }
 
 $section->addInput(new Form_Select(
-	'rrd',
-	'RRD File',
-	$rrd,
-	$rrd_options
+	'interface',
+	'Interface',
+	$interface,
+	$if_options
+));
+
+$section->addInput(new Form_Select(
+	'units',
+	'Units',
+	$units,
+	array_flip($unitlist)
+));
+
+$section->addInput(new Form_Select(
+	'startyear',
+	'Year',
+	$startyear,
+	array("0" => "All") + array_combine(range($lastyear, $firstyear, -1), range($lastyear, $firstyear, -1))
 ));
 
 $section->addInput(new Form_Select(
@@ -93,18 +153,29 @@ function print_rrd_summary_table($data) { ?>
 <div class="panel panel-default">
 	<div class="panel-heading"><h2 class="panel-title"><?=gettext("RRD Summary")?></h2></div>
 	<div class="panel-body">
-		<strong>This Month (to date, does not include this hour, starting at day <?=$startday; ?>):</strong>
-		<?php print_rrd_summary_table($thismonth); ?>
-		<br/>
-		<strong>Last Month:</strong>
-		<?php print_rrd_summary_table($lastmonth); ?>
+		<div class="table-responsive">
+			<strong>Estimated monthly traffic for given time period beginning on day <?=$startday; ?> of each month</strong>
+			<table class="table table-striped table-hover table-condensed sortable-theme-bootstrap" data-sortable id="rrdsummary">
+				<thead>
+					<tr>
+						<th data-sortable-type="alpha"><?=gettext("Period")?></th>
+						<th data-sortable-type="numeric"><?=gettext("Avg Traffic In")?></th>
+						<th data-sortable-type="numeric"><?=gettext("Avg Traffic Out")?></th>
+						<th data-sortable-type="numeric"><?=gettext("Est Total Traffic")?></th>
+					</tr>
+				</thead>
+				<tbody>
+					<?php print_rrd_summary($rrd, $units, $startyear, $startday); ?>
+				</tbody>
+			</table>
+		</div>
 	</div>
 </div>
 
 <script type="text/javascript">
 //<![CDATA[
 events.push(function(){
-	$('#rrd, #startday').on('change', function(){
+	$('#interface, #units, #startyear, #startday').on('change', function(){
 		$(this).parents('form').submit();
 	});
 });
diff --git a/sysutils/pfSense-pkg-RRD_Summary/pkg-descr b/sysutils/pfSense-pkg-RRD_Summary/pkg-descr
index 15a451d87bd6..c039e921fc2a 100644
--- a/sysutils/pfSense-pkg-RRD_Summary/pkg-descr
+++ b/sysutils/pfSense-pkg-RRD_Summary/pkg-descr
@@ -1,2 +1,2 @@
-RRD Summary Page, which will give a total amount of traffic passed In/Out during
-this and the previous month.
+RRD Summary Page, which will give estimated month-over-month traffic passed
+In/Out during the specified period.