diff --git a/chntunnel/chntunnel.sh b/chntunnel/chntunnel.sh
index d470d09..c27e81a 100644
--- a/chntunnel/chntunnel.sh
+++ b/chntunnel/chntunnel.sh
@@ -80,34 +80,35 @@ cidr() {
 
 newGre() {
 	cat << EOF > /etc/sysconfig/network-scripts/ifcfg-$4
-	DEVICE=$4
-	BOOTPROTO=none
-	ONBOOT=yes
-	DEVICETYPE=tunnel
-	TYPE=GRE
-	PEER_INNER_IPADDR=$2
-	PEER_OUTER_IPADDR=$3
-	MY_INNER_IPADDR=$1
+DEVICE=$4
+BOOTPROTO=none
+ONBOOT=yes
+DEVICETYPE=tunnel
+TYPE=GRE
+PEER_INNER_IPADDR=$2
+PEER_OUTER_IPADDR=$3
+MY_INNER_IPADDR=$1
 EOF
 }
 
 addRoutes() {
 	cat << EOF > /etc/rc.local
-	#!/bin/bash
-	# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
-	#
-	# It is highly advisable to create own systemd services or udev rules
-	# to run scripts during boot instead of using this file.
-	#
-	# In contrast to previous versions due to parallel execution during boot
-	# this script will NOT be run after all other services.
-	#
-	# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
-	# that this script will be executed during boot.
-	touch /var/lock/subsys/local
-	ip route flush table $1
-	ip route add default via $2 dev $3 src $4 table $1               
-	ip rule add from $4 table $1
+#!/bin/bash
+# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
+#
+# It is highly advisable to create own systemd services or udev rules
+# to run scripts during boot instead of using this file.
+#
+# In contrast to previous versions due to parallel execution during boot
+# this script will NOT be run after all other services.
+#
+# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
+# that this script will be executed during boot.
+touch /var/lock/subsys/local
+
+ip route flush table $1
+ip route add default via $2 dev $3 src $4 table $1               
+ip rule add from $4 table $1
 EOF
 }
 
@@ -156,8 +157,8 @@ if [ $# != 0 ]; then
 			# 		echo $IPADDR/$CIDR >> $GFWLIST || exit
 			# 	done
 		elif [[ $param = '-g' || $param = '--gre-tunnel' ]]; then
-			lsmod | grep ip_gre && result=$? && [[ $result != '0' ]] && modprobe ip_gre
-			lsmod | grep ip_gre && result=$? && [[ $result != '0' ]] && msg_err "The current system does not support GRE tunnel." && exit 1
+			lsmod | grep ip_gre >/dev/null && result=$? && [[ $result != '0' ]] && modprobe ip_gre
+			lsmod | grep ip_gre >/dev/null && result=$? && [[ $result != '0' ]] && msg_err "The current system does not support GRE tunnel." && exit 1
 			msg "Prepare to establish a gre tunnel"
 			read -rp "TUNNEL_NAME (default: tun0)" TUNNEL_NAME
 			[[ -f "/etc/sysconfig/network-scripts/ifcfg-${TUNNEL_NAME:-tun0}" ]] &&  msg_err "This tunnel already exists, please do not create it again." && exit 1
@@ -166,8 +167,7 @@ if [ $# != 0 ]; then
 			read -rp "PEER_OUTER_IPADDR: " PEER_OUTER_IPADDR
 			newGre $MY_INNER_IPADDR $PEER_INNER_IPADDR $PEER_OUTER_IPADDR ${TUNNEL_NAME:-tun0}
 			ifup ${TUNNEL_NAME:-tun0}
-			ping -c 3 $PEER_INNER_IPADDR && result=$?
-			[[ $result -eq 0 ]] && msg_pass "Tunnel created successfully!" && exit 0
+			ping -c 3 $PEER_INNER_IPADDR >/dev/null && result=$? && [[ $result -eq 0 ]] && msg_pass "Tunnel created successfully!" && exit 0
 		elif [[ $param = '-f' || $param = '--gfw-list' ]]; then
 			peer=$(ip addr | grep peer | grep inet | awk -F ' ' {'print $4'})
 			PEER_INNER_IPADDR=${peer%%/*}
@@ -179,9 +179,10 @@ if [ $# != 0 ]; then
 				done
 			msg_pass "GFWlist is active, enjoy~"
 		elif [[ $param = '-w' || $param = '--white-list' ]]; then
+			msg_err "TODO: not yet implemented, only manually." && exit 1
 			local_gw=$(ip route | grep default | awk -F ' ' {'print $3'})
-			local_dev=$(ip route | grep src | awk -F ' ' {'print $3'})
-			local_addr=$(ip route | grep src | awk -F ' ' {'print $9'})
+			#local_dev=$(ip route | grep src | awk -F ' ' {'print $3'})
+			#local_addr=$(ip route | grep src | awk -F ' ' {'print $9'})
 			local_table='cn'
 			peer=$(ip addr | grep peer | grep inet | awk -F ' ' {'print $4'})
 			PEER_INNER_IPADDR=${peer%%/*}
@@ -195,8 +196,8 @@ if [ $# != 0 ]; then
 					ip route add $line via $local_gw
 					echo "any net $line gw $local_gw" >>/etc/sysconfig/static-routes || exit
 				done
-			ip route del default via $local_gw
-			ip route add default via $PEER_INNER_IPADDR
+			#ip route del default via $local_gw
+			#ip route add default via $PEER_INNER_IPADDR
 		else
 			help
 		fi
@@ -204,5 +205,3 @@ if [ $# != 0 ]; then
 else
 	help
 fi
-#TODO:白名单
-#TODO:设置DNS