#!/bin/sh old_unit=$1 new_unit=$2 if [ $old_unit != -1 ]; then ifconfig sl$old_unit delete down if [ $new_unit == -1 ]; then route delete default fi fi if [ $new_unit != -1 ]; then ifconfig sl$new_unit <address1> <address2> if [ $old_unit == -1 ]; then route add default <address2> fi fi