====== Redhat - Networking - Setup virtual IP ======

A virtual IP is an ip that bind to a physical ethernet card that already has a physical ip address. 


1. Add virtual ip to eth0.  

Here is the original configuration of /etc/sysconfig/network-scripts/ifcfg-eth0.  ifcfg-eth0 is the original configuration file for eth0.

<code bash>
vi /etc/sysconfig/network-scripts/ifcfg-eth0
</code>

<file bash /etc/sysconfig/network-scripts/ifcfg-eth0>
BOOTPROTO=static
BROADCAST=192.168.0.255
HWADDR=00:0C:29:C8:AA:7C
IPADDR=192.168.0.10
NETMASK=255.255.255.0
NETWORK=192.168.0.0
ONBOOT=yes
TYPE=Ethernet
</file>


2. Create a new virtual configuration file by copying and editing the ifcfg-eth0 configuration file.  

Change the IPADDR and remove HWADDR.

<code bash>
cd /etc/sysconfig/network-scripts
cp ifcfg-eth0 ifcfg-eth0:0
vi ifcfg-eth0:0
</code>

<file bash ifcfg-eth0:0>
BOOTPROTO=static
BROADCAST=192.168.0.255
IPADDR=192.168.0.11
NETMASK=255.255.255.0
NETWORK=192.168.0.0
ONBOOT=yes
TYPE=Ethernet
</file>


3. Restart network

<code bash>
/etc/init.d/network restart
</code>


4. Check your new virtual ip using ifconfig

<code bash>
ifconfig
</code>