diff --git a/chntunnel/chntunnel.sh b/chntunnel/chntunnel.sh
index 68804a8..0585059 100644
--- a/chntunnel/chntunnel.sh
+++ b/chntunnel/chntunnel.sh
@@ -190,7 +190,7 @@ if [ $# != 0 ]; then
 			peer=$(ip addr | grep peer | grep inet | awk -F ' ' {'print $4'})
 			PEER_INNER_IPADDR=${peer%%/*}
 			:>/etc/sysconfig/static-routes
-			grep $local_table /etc/iproute2/rt_tables && result=$?
+			grep $local_table /etc/iproute2/rt_tables >/dev/null && result=$?
 			[[ $result != '0' ]] && echo "200 $local_table" >>/etc/iproute2/rt_tables
 			#grep $local_table /etc/rc.local && result=$?
 			#[[ $result != '0' ]] && addRoutes $local_table $local_gw $local_dev $local_addr && chmod +x /etc/rc.local && /etc/rc.local