diff --git a/xCAT/postscripts/enablekdump b/xCAT/postscripts/enablekdump
index 1c6ad2d92..f713c69cf 100755
--- a/xCAT/postscripts/enablekdump
+++ b/xCAT/postscripts/enablekdump
@@ -31,7 +31,8 @@ for i in `/bin/cat /proc/cmdline`; do
         break
     elif [ "$KEY" = "BOOTIF" ]; then
         MACX=`/bin/echo $i | /bin/awk -F= '{print $2}'|sed -e s/^01-// -e s/-/:/g`
-        ETHX=`/sbin/ifconfig | /bin/grep -i $MACX | /bin/awk '{print $1}'`
+        #ETHX=`/sbin/ifconfig | /bin/grep -i $MACX | /bin/awk '{print $1}'`
+        ETHX=`/sbin/ip -oneline link show ens33|/bin/grep -i $MACX |/bin/awk -F ":" '{print $2}'|/bin/grep -o "[^ ]\+\( \+[^ ]\+\)*"`
         break
     fi
 done
diff --git a/xCAT/postscripts/hardeths b/xCAT/postscripts/hardeths
index f3f8b2236..3c72f3dd0 100755
--- a/xCAT/postscripts/hardeths
+++ b/xCAT/postscripts/hardeths
@@ -81,7 +81,8 @@ for nic in `ip link |grep "BROADCAST" |awk '{print $2}'   | sed s/://`; do
     if ( pmatch $OSVER "ubuntu*" )
     then
         NETWORK=`network_ipv4calc $IPADDR $NETMASK`
-        BROADCAST=`ifconfig $nic | grep Bcast | awk '{print $3}' | awk -F: '{print $2}'`
+        #BROADCAST=`ifconfig $nic | grep Bcast | awk '{print $3}' | awk -F: '{print $2}'`
+        BROADCAST=`ip -4 -oneline addr show $nic|grep brd| awk -F ' ' '{print $6}'`
         
         if [ ! -z "$defgw" ]; then
             gateway_line="gateway $defgw"