1. Adding a network alias from command line in RH or CentOS Linux:
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/sbin/ifconfig lo 127.0.0.1
/sbin/ifconfig eth0 up
/sbin/ifconfig eth0 10.0.0.1
/sbin/ifconfig eth0:1 192.168.0.1
/sbin/ifconfig eth0:2 192.168.0.2
2. Configure a script to setup your network/IP aliases on boot:
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cd /etc/sysconfig/network-scripts/
cp ifcfg-eth0 ifcfg-eth0:1
cp ifcfg-eth0 ifcfg-eth0:2
Then edit ifcfg-eth0:1 and ifcfg-eth0:2 files and add your IP aliases there. For example:
cat /etc/sysconfig/network-scripts/ifcfg-eth0\:1
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DEVICE=eth0:1
IPADDR=192.168.0.2
NETMASK=255.255.255.248
ONBOOT=yes
3. Also in RH and CentOS Linux it is possible to add as IP aliases a range of IPs. To do that go to :
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cd /etc/sysconfig/network-scripts/
directory and create a file:
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touch ifcfg-eth0-range0
with the following content:
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IPADDR_START=192.168.0.1
IPADDR_END=192.168.0.6
CLONENUM_START=1
NETMASK=255.255.255.248
* IPADDR_START is the address, from which your IP range is starting.
* IPADDR_END is the address, by which your IP range is ending.
* CLONENUM_START is the number of virtual device the first IP address will be assigned to. In the above example, applying configuration changes will make IP address 192.168.0.1 to be mapped to eth0:1 virtual device. 192.168.0.2 to eth0:2 etc.
You can create several ranges (ifcfg-eth0-range1, ifcfg-eth0-range2 etc.). Just take care of CLONENUM_START value for these ranges not to overlap. To apply configuration you will need to issue:
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service network restart
