diff --git a/xCAT/postscripts/routeop b/xCAT/postscripts/routeop
index c0297364f..545e436b0 100755
--- a/xCAT/postscripts/routeop
+++ b/xCAT/postscripts/routeop
@@ -240,8 +240,13 @@ add_persistent_route()
                             echo "  up route -A inet6 add $net/$mask gw $gw" >> $tempfile
                             echo "  down route -A inet6 del $net/$mask gw $gw" >> $tempfile
                         else
-                            echo "  up route add -net $net netmask $mask gw $gw" >> $tempfile
-                            echo "  down route del -net $net netmask $mask gw $gw" >> $tempfile
+			    if [ "$gw" = "" -o "$gw" = "0.0.0.0" ] ; then
+                                echo "  up route add -net $net netmask $mask dev $ifname" >> $tempfile
+                                echo "  down route del -net $net netmask $mask dev $ifname" >> $tempfile
+			    else
+                                echo "  up route add -net $net netmask $mask gw $gw" >> $tempfile
+                                echo "  down route del -net $net netmask $mask gw $gw" >> $tempfile
+			    fi
                         fi
                     fi
                     echo $LINE | grep "iface $ifname " 2>&1 1>/dev/null
@@ -258,8 +263,13 @@ add_persistent_route()
                         echo "  up route -A inet6 add $net/$mask gw $gw" >> $tempfile
                         echo "  down route -A inet6 del $net/$mask gw $gw" >> $tempfile
                     else
-                        echo "  up route add -net $net netmask $mask gw $gw" >> $tempfile
-                        echo "  down route del -net $net netmask $mask gw $gw" >> $tempfile
+		        if [ "$gw" = "" -o "$gw" = "0.0.0.0" ] ; then
+                            echo "  up route add -net $net netmask $mask dev $ifname" >> $tempfile
+                            echo "  down route del -net $net netmask $mask dev $ifname" >> $tempfile
+			else
+                            echo "  up route add -net $net netmask $mask gw $gw" >> $tempfile
+                            echo "  down route del -net $net netmask $mask gw $gw" >> $tempfile
+			fi
                     fi 
                 fi
                 mv -f $tempfile $filename