This script add all IP in single file as an alias

| /etc/network/ip_range

192.168.1.4
192.168.1.5
192.168.1.7
192.168.1.8
192.168.1.11
10.10.1.34
10.10.1.23

| /etc/network/ipalias.sh

#!/bin/bash
i=0;
while read ip
do
/sbin/ifconfig eth0:${i} $ip netmask 255.255.255.240 up
let i=$i+1
done < /etc/network/ip_range

chmod 755 /etc/network/ipalias.sh

execute script in cron @reboot or /etc/rc.local