net/mwan3: add ttl check

Add the additional optional ttl check to test the connection.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/mwan3/files/usr/sbin/mwan3track

@@ -55,6 +55,7 @@ main() {
 	local recovery_interval down up size
 	local keep_failure_interval check_quality failure_latency
 	local recovery_latency failure_loss recovery_loss
+	local max_ttl
 
 	[ -z "$5" ] && echo "Error: should not be started manually" && exit 0
 
@@ -84,6 +85,7 @@ main() {
 	config_get down $1 down 5
 	config_get up $1 up 5
 	config_get size $1 size 56
+	config_get max_ttl $1 max_ttl 60
 	config_get failure_interval $1 failure_interval $interval
 	config_get_bool keep_failure_interval $1 keep_failure_interval 0
 	config_get recovery_interval $1 recovery_interval $interval
@@ -120,10 +122,10 @@ main() {
 				case "$track_method" in
 					ping)
 						if [ $check_quality -eq 0 ]; then
-							ping -I $DEVICE -c $count -W $timeout -s $size -q $track_ip &> /dev/null
+							ping -I $DEVICE -c $count -W $timeout -s $size -t $max_ttl -q $track_ip &> /dev/null
 							result=$?
 						else
-							ping_result="$(ping -I $DEVICE -c $count -W $timeout -s $size -q $track_ip | tail -2)"
+							ping_result="$(ping -I $DEVICE -c $count -W $timeout -s $size -t $max_ttl -q $track_ip | tail -2)"
 							loss="$(echo "$ping_result" | grep "packet loss" |  cut -d "," -f3 | awk '{print $1}' | sed -e 's/%//')"
 							if [ "$loss" -eq 100 ]; then
 								latency=999999