diff --git a/net/mwan3/Makefile b/net/mwan3/Makefile
index 328c2d0e9..f26a5ab58 100644
--- a/net/mwan3/Makefile
+++ b/net/mwan3/Makefile
@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mwan3
-PKG_VERSION:=2.0
+PKG_VERSION:=2.1
 PKG_RELEASE:=4
 PKG_MAINTAINER:=Jeroen Louwes <jeroen.louwes@gmail.com>, \
 		Florian Eckert <fe@dev.tdt.de>
diff --git a/net/mwan3/files/etc/hotplug.d/iface/15-mwan3 b/net/mwan3/files/etc/hotplug.d/iface/15-mwan3
index 86e60e133..7d6cd98c4 100644
--- a/net/mwan3/files/etc/hotplug.d/iface/15-mwan3
+++ b/net/mwan3/files/etc/hotplug.d/iface/15-mwan3
@@ -46,6 +46,7 @@ case "$ACTION" in
 		mwan3_track $INTERFACE $DEVICE
 		mwan3_set_policies_iptables
 		mwan3_set_user_rules
+		mwan3_flush_conntrack $INTERFACE $DEVICE "ifup"
 	;;
 	ifdown)
 		mwan3_delete_iface_rules $INTERFACE
@@ -54,6 +55,7 @@ case "$ACTION" in
 		mwan3_delete_iface_ipset_entries $INTERFACE
 		mwan3_set_policies_iptables
 		mwan3_set_user_rules
+		mwan3_flush_conntrack $INTERFACE $DEVICE "ifdown"
 	;;
 esac
 
diff --git a/net/mwan3/files/lib/mwan3/mwan3.sh b/net/mwan3/files/lib/mwan3/mwan3.sh
index 1e1de969f..0d139be04 100644
--- a/net/mwan3/files/lib/mwan3/mwan3.sh
+++ b/net/mwan3/files/lib/mwan3/mwan3.sh
@@ -6,6 +6,7 @@ IPS="/usr/sbin/ipset"
 IPT4="/usr/sbin/iptables -t mangle -w"
 IPT6="/usr/sbin/ip6tables -t mangle -w"
 LOG="/usr/bin/logger -t mwan3 -p"
+CONNTRACK_FILE="/proc/net/nf_conntrack"
 
 mwan3_get_iface_id()
 {
@@ -360,7 +361,7 @@ mwan3_delete_iface_ipset_entries()
 
 mwan3_track()
 {
-	local track_ip track_ips reliability count timeout interval down up
+	local track_ip track_ips reliability count timeout interval down up size
 
 	mwan3_list_track_ips()
 	{
@@ -380,8 +381,9 @@ mwan3_track()
 		config_get interval $1 interval 10
 		config_get down $1 down 5
 		config_get up $1 up 5
+		config_get size $1 size 56
 
-		[ -x /usr/sbin/mwan3track ] && /usr/sbin/mwan3track $1 $2 $reliability $count $timeout $interval $down $up $track_ips &
+		[ -x /usr/sbin/mwan3track ] && /usr/sbin/mwan3track $1 $2 $reliability $count $timeout $interval $down $up $size $track_ips &
 	fi
 }
 
@@ -804,3 +806,36 @@ mwan3_report_rules_v6()
 		$IPT6 -L mwan3_rules -n -v 2> /dev/null | tail -n+3 | sed 's/mark.*//' | sed 's/mwan3_policy_/- /' | sed 's/mwan3_rule_/S /'
 	fi
 }
+
+mwan3_flush_conntrack()
+{
+	local flush_conntrack
+
+	config_get flush_conntrack $1 flush_conntrack never
+
+	if [ -e "$CONNTRACK_FILE" ]; then
+		case $flush_conntrack in
+			ifup)
+				[ "$3" = "ifup" ] && {
+					echo f > ${CONNTRACK_FILE}
+					$LOG info "connection tracking flushed on interface $1 ($2) $3"
+				}
+				;;
+			ifdown)
+				[ "$3" = "ifdown" ] && {
+					echo f > ${CONNTRACK_FILE}
+					$LOG info "connection tracking flushed on interface $1 ($2) $3"
+				}
+				;;
+			always)
+				echo f > ${CONNTRACK_FILE}
+				$LOG info "connection tracking flushed on interface $1 ($2) $3"
+				;;
+			never)
+				$LOG info "connection tracking not flushed on interface $1 ($2) $3"
+				;;
+		esac
+	else
+		$LOG warning "connection tracking not enabled"
+	fi
+}
diff --git a/net/mwan3/files/usr/sbin/mwan3track b/net/mwan3/files/usr/sbin/mwan3track
index 35f97fe0d..ca541714c 100755
--- a/net/mwan3/files/usr/sbin/mwan3track
+++ b/net/mwan3/files/usr/sbin/mwan3track
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-[ -z "$9" ] && echo "Error: should not be started manually" && exit 0
+[ -z "$10" ] && echo "Error: should not be started manually" && exit 0
 
 if [ -e /var/run/mwan3track-$1.pid ] ; then
 	kill $(cat /var/run/mwan3track-$1.pid) &> /dev/null
@@ -17,7 +17,7 @@ lost=0
 while true; do
 
 	for track_ip in $track_ips; do
-		ping -I $2 -c $4 -W $5 -q $track_ip &> /dev/null
+		ping -I $2 -c $4 -W $5 -s $9 -q $track_ip &> /dev/null
 		if [ $? -eq 0 ]; then
 			let host_up_count++
 		else