diff --git a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
index 615c0fad2..9fcfb89ca 100755
--- a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
+++ b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
@@ -1376,7 +1376,8 @@ if [ -n "$OMR_TRACKER_INTERFACE" ] && ([ "$(uci -q get openmptcprouter.$OMR_TRAC
 					omrtracebox="$(omr-tracebox-mptcp $serverip $OMR_TRACKER_DEVICE)"
 					[ -n "$omrtracebox" ] && [ -z "$(echo $omrtracebox | grep error)" ] && uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.mptcp_status="$omrtracebox"
 				}
-				if [ "$OMR_TRACKER_INTERFACE" != "omrvpn" ] && [ "$(uci -q get glorytun.vpn.enable)" != "1" ] && [ "$(uci -q get glorytun-udp.vpn.enable)" != "1" ] && [ -n "$OMR_TRACKER_DEVICE" ]; then
+				#if [ "$OMR_TRACKER_INTERFACE" != "omrvpn" ] && [ "$(uci -q get glorytun.vpn.enable)" != "1" ] && [ "$(uci -q get glorytun-udp.vpn.enable)" != "1" ] && [ -n "$OMR_TRACKER_DEVICE" ]; then
+				if [ "$OMR_TRACKER_INTERFACE" != "omrvpn" ] && [ -n "$OMR_TRACKER_DEVICE" ]; then
 					if [ -n "$(uci -q get network.$(find_network_device ${OMR_TRACKER_INTERFACE}).mtu)" ]; then
 						network_device=$(find_network_device ${OMR_TRACKER_INTERFACE})
 						mtu=""
@@ -1449,7 +1450,8 @@ if [ -n "$OMR_TRACKER_INTERFACE" ] && ([ "$(uci -q get openmptcprouter.$OMR_TRAC
 					omrtracebox="$(omr-tracebox-mptcp $serverip $OMR_TRACKER_DEVICE)"
 					[ -n "$omrtracebox" ] && [ -z "$(echo $omrtracebox | grep error)" ] && uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.mptcp_status="$omrtracebox"
 				}
-				if [ "$OMR_TRACKER_INTERFACE" != "omrvpn" ] && [ "$(uci -q get glorytun.vpn.enable)" != "1" ] && [ "$(uci -q get glorytun-udp.vpn.enable)" != "1" ] && [ -n "$OMR_TRACKER_DEVICE" ]; then
+				#if [ "$OMR_TRACKER_INTERFACE" != "omrvpn" ] && [ "$(uci -q get glorytun.vpn.enable)" != "1" ] && [ "$(uci -q get glorytun-udp.vpn.enable)" != "1" ] && [ -n "$OMR_TRACKER_DEVICE" ]; then
+				if [ "$OMR_TRACKER_INTERFACE" != "omrvpn" ] && [ -n "$OMR_TRACKER_DEVICE" ]; then
 					network_device=$(find_network_device ${OMR_TRACKER_INTERFACE})
 					if [ -n "$network_device" ] && [ -n "$(uci -q get network.${network_device}.mtu)" ]; then
 						mtu=$(uci -q get network.$(find_network_device ${OMR_TRACKER_INTERFACE}).mtu)
@@ -1459,13 +1461,13 @@ if [ -n "$OMR_TRACKER_INTERFACE" ] && ([ "$(uci -q get openmptcprouter.$OMR_TRAC
 						}
 					elif [ -n "$OMR_TRACKER_DEVICE_IP" ]; then
 						[ -n "$serverip" ] && [ "$serverip" != "127.0.0.1" ] && {
-							local mtu=$(omr-mtu $OMR_TRACKER_DEVICE_IP $serverip)
+							local mtu=$(omr-mtu6 $OMR_TRACKER_DEVICE_IP6 $serverip)
 							[ -n "$mtu" ] && {
 								uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.mtu=$mtu
 								ip link set dev $OMR_TRACKER_DEVICE mtu $mtu > /dev/null 2>&1
 							}
 						} || {
-							local mtu=$(omr-mtu $OMR_TRACKER_DEVICE_IP 1.1.1.1)
+							local mtu=$(omr-mtu6 $OMR_TRACKER_DEVICE_IP 2606:4700:4700::1111)
 							[ -n "$mtu" ] && {
 								uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.mtu=$mtu
 								ip link set dev $OMR_TRACKER_DEVICE mtu $mtu > /dev/null 2>&1
diff --git a/openmptcprouter/files/bin/omr-mtu6 b/openmptcprouter/files/bin/omr-mtu6
new file mode 100755
index 000000000..df63bdd54
--- /dev/null
+++ b/openmptcprouter/files/bin/omr-mtu6
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+PKT_SIZE=1472
+INTERFACE="$1"
+HOSTNAME="$2"
+
+#count=$(ping -q -w 1 -M do -c 1 -s $PKT_SIZE -I $INTERFACE $HOSTNAME | grep -cE 'Message too long|100% packet loss')
+#count=$(ping -B -w 1 -M do -c 1 -s $PKT_SIZE -I $INTERFACE $HOSTNAME 2>&1 | grep -c 'Message too long')
+count=$(ping -6 -B -w 2 -M do -c 3 -s $PKT_SIZE -I $INTERFACE $HOSTNAME 2>&1 | grep -cE 'Message too long|100% packet loss')
+
+while [ $count -ge 1 ]; do
+	PKT_SIZE=$((PKT_SIZE - 1))
+	if [ "$PKT_SIZE" -lt "1252" ]; then 
+		exit 0
+	fi
+	#count=$(ping -q -w 1 -M do -c 1 -s $PKT_SIZE -I $INTERFACE $HOSTNAME | grep -cE 'Message too long|100% packet loss')
+	#count=$(ping -B -w 1 -M do -c 1 -s $PKT_SIZE -I $INTERFACE $HOSTNAME 2>&1 | grep -c 'Message too long')
+	count=$(ping -6 -B -w 2 -M do -c 3 -s $PKT_SIZE -I $INTERFACE $HOSTNAME 2>&1 | grep -cE 'Message too long|100% packet loss')
+done
+
+printf "$((PKT_SIZE + 28))"
\ No newline at end of file