diff --git a/sbin/if_down b/sbin/if_down
index 97c4363..88338d2 100755
--- a/sbin/if_down
+++ b/sbin/if_down
@@ -36,7 +36,8 @@ if [ ! "$DEV" ]; then
 	exit 10
 fi
 if [ -f /etc/sysconfig/net/${DEV}.dhcp ]; then
-	kill `ps -ef|grep dhclient|grep eth0|awk '{print $2}'`
+	kill `ps -ef|grep dhclient|grep ${DEV}|awk '{print $2}'`
+	ifconfig $DEV 0.0.0.0 down
 elif [ -f /etc/sysconfig/net/hostname.${DEV} ]; then
 	HOST=`cat /etc/sysconfig/net/hostname.${DEV}|awk '{print $1}'`
 	IP=`grep $HOST /etc/hosts|awk '{print $1}'`