How to Multiple IP on ONE NIC on RHEL 6.3 ,CentOS 6.3 or Scientific Linux 6.3

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[root@server1 ~]# cd /etc/sysconfig/network-scripts/ [root@server1 network-scripts]# ls [root@server1 network-scripts]# cat ifcfg-eth0 DEVICE=eth0 BOOTPROTO=static HWADDR=00:e0:4c:04:7d:2b NM_CONTROLLED=yes ONBOOT=yes TYPE=Ethernet UUID="587b9935-5b28-45e3-8d45-ae3e179f9ad0" IPADDR=192.168.0.254 NETMASK=255.255.255.0 GATEWAY=192.168.0.254 DNS1=192.168.0.254 IPV6INIT=no USERCTL=no [Note:Before editing network configuration file, take backup of it.] eth0:1 is an alias of the eth0 interface. Now, let’s assign a different IP address to eth0:1. Other NIC aliases could be named eth0:2, eth0:3 etc. [root@server1 network-scripts]# cp ifcfg-eth0 ifcfg-eth0:1 [root@server1 network-scripts]# vim ifcfg-eth0:1 DEVICE=eth0:1 BOOTPROTO=static HWADDR=00:e0:4c:04:7d:2b NM_CONTROLLED=yes ONBOOT=yes TYPE=Ethernet UUID="587b9935-5b28-45e3-8d45-ae3e179f9ad0" IPADDR=192.168.0.2 NETMASK=255.255.255.0 GATEWAY=192.168.0.254 DNS1=192.168.0.254 IPV6INIT=no USERCTL=no Read More

[root@server1 ~]# cd /etc/sysconfig/network-scripts/
[root@server1 network-scripts]# ls
[root@server1 network-scripts]# cat ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
HWADDR=00:e0:4c:04:7d:2b
NM_CONTROLLED=yes
ONBOOT=yes
TYPE=Ethernet
UUID="587b9935-5b28-45e3-8d45-ae3e179f9ad0"
IPADDR=192.168.0.254
NETMASK=255.255.255.0
GATEWAY=192.168.0.254
DNS1=192.168.0.254
IPV6INIT=no
USERCTL=no

[Note:Before editing network configuration file, take backup of it.]

eth0:1 is an alias of the eth0 interface. Now, let’s assign a different IP address to eth0:1. Other NIC aliases could be named eth0:2, eth0:3 etc.

[root@server1 network-scripts]# cp ifcfg-eth0 ifcfg-eth0:1
[root@server1 network-scripts]# vim ifcfg-eth0:1
DEVICE=eth0:1
BOOTPROTO=static
HWADDR=00:e0:4c:04:7d:2b
NM_CONTROLLED=yes
ONBOOT=yes
TYPE=Ethernet
UUID="587b9935-5b28-45e3-8d45-ae3e179f9ad0"
IPADDR=192.168.0.2
NETMASK=255.255.255.0
GATEWAY=192.168.0.254
DNS1=192.168.0.254
IPV6INIT=no
USERCTL=no
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