$ cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
BROADCAST=192.168.99.255
IPADDR=192.168.1.1
NETMASK=255.255.255.0
NETWORK=192.168.1.0
ONBOOT=yes
STEP 2 (2nd IP address: )
$ cat /etc/sysconfig/network-scripts/ifcfg-eth0:1
DEVICE=eth0:1
BOOTPROTO=static
BROADCAST=192.168.99.255
IPADDR=192.168.1.2
NETMASK=255.255.255.0
NETWORK=192.168.1.0
ONBOOT=yes
Note, in STEP 1 the filename is “ifcfg-eth0″, whereas in STEP 2 it’s “ifcfg-eth0:1″ and also not the matching entries for “DEVICE=…”. Also, obviously, the “IPADDR” is different as well.
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source:http://linuxpoison.blogspot.com/2008/10/13578175718308.html