diff --git a/check_inet.sh b/check_inet.sh
index 4e255c6..a87ab03 100755
--- a/check_inet.sh
+++ b/check_inet.sh
@@ -6,7 +6,7 @@ device=${1:-"ppp0"}
 
 provider=${2:-"dsl-provider"}
 
-ptp_addr=`ifconfig $device 2>/dev/null | grep -e "P-[tz]-P" | cut -d":" -f3 | cut -d " " -f1`
+ptp_addr="$(ip addr show $device | grep peer | awk '{print$4}' | cut -d '/' -f1)"
 
 alternate_addr="google.com heise.de debian.org ubuntu.com"
 
@@ -16,9 +16,9 @@ reconnect() {
    killall -9 pppd
    sleep 2
    ifup $provider >/dev/null 2> /dev/null
-   sleep 3
-   ptp_addr=`ifconfig $device 2>/dev/null | grep -e "P-[tz]-P" | cut -d":" -f3 | cut -d " " -f1`
-   if [ "X$ptp_addr" == "X" ] ; then
+   sleep 5
+   ptp_addr="$(ip addr show $device | grep peer | awk '{print$4}' | cut -d '/' -f1)"
+   if [[ -z "$ptp_addr" ]] ; then
       echo "[ Error ]: reconnection host `hostname --long` failed at `date +\"%d.%m.%Y %H:%M:%S\"`"
    else
       echo "[ `hostname --long`]:  reconnected at `date +\"%d.%m.%Y %H:%M:%S\"`"
@@ -27,7 +27,7 @@ reconnect() {
    echo "`df`"
 }
 
-if [ "X$ptp_addr" == "X" ] ; then
+if [[ -z "$ptp_addr" ]] ; then
    reconnect
 else
    ping -c3 $ptp_addr >/dev/null 2> /dev/null