This script add all IP in single file as an alias
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
#!/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