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Assign range of IP addresses to an interface.

Sometimes you may need to assign a wide range of IP addresses to your network interface in Linux systems. Instead of manually creating aliases for the network interface, it is much quicker to use the network ip range instead.

For example, you need to assign the IP range 192.168.10.6 – 192.168.10.100 to your eth0 interface.

Create a range file in /etc/sysconfig/network-scripts/ifcfg-eth0-range0 as below

DEVICE=eth0
BOOTPROTO=static
IPADDR_START=192.168.10.6
IPADDR_END=192.168.10.100
NETMASK=255.255.255.0
CLONENUM_START=1
ONBOOT=yes
TYPE=Ethernet

CLONENUM_START is the number that will be assigned to the first IP alias interface (eth0:1 in this example).

If you need to add more ranges of IPs then just use a different file for eg. ifcfg-eth0-range1, for each one of the ranges. Make sure CLONENUM_START does not overwrite other aliases.

Once you have configured the range/s of IPs you just need to restart the network service in order to activate it

service network restart

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