-[ "$ACTION" = "ifup" -a "$INTERFACE" = "wan" ] && /usr/sbin/ez-ipupdate -c /etc/ez-ipupdate.conf &
+NAME=ez-ipupdate
+CONFIG=/etc/$NAME.conf
+COMMAND=/usr/sbin/$NAME
+
+[ "$ACTION" = "ifup" -a "$INTERFACE" = "wan" ] && {
+ [ -x $COMMAND ] && [ -r $CONFIG ] && {
+ eval "ifname=\"\${${INTERFACE}_ifname}\""
+ $COMMAND -c $CONFIG -i $ifname 2>&1 | logger -t $NAME
+ } &
+}