You can use ifconfig command to configure a network interface and alias. For example:
- eth0 NIC IP 192.168.1.5
- eth0:0 first NIC alias: 192.168.1.6
To setup eth0:0 alias type the following command as the root user:
# ifconfig eth0:0 192.168.1.6 upVerify alias is up and running using following command:
# ifconfig -a# ping 192.168.1.6
However, if you reboot the system you will lost all your alias. To make it permanent you need to add it network configuration file.
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Copy etc/sysconfig/network-scripts/ifcfg-eth0 file as /etc/sysconfig/network-scripts/ifcfg-eth0:0
# cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:0
Open file /etc/sysconfig/network-scripts/ifcfg-eth0:0 using vi text editor:
# vi /etc/sysconfig/network-scripts/ifcfg-eth0:0
Find entry that read as follows:
DEVICE=eth0
Replace with:
DEVICE=eth0:0
Find entry that read as follows:
IPADDR=xxx.xxx.xxx.xxx
Replace it with your actual IP address:
IPADDR=192.168.1.7
At the end your file should like as follows:
DEVICE=eth0:0
IPADDR=192.168.1.7
NETMASK=255.255.255.0
NETWORK=192.168.1.0
ONBOOT=yes
NAME=eth0:0
Open file /etc/sysconfig/network-scripts/ifcfg-eth0 and make sure file does not have a GATEWAY= entry:
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
Find the entry that read as follows:
GATEWAY=your-ip
Remove or comment it out by prefixing # (hash) :
# GATEWAY=192.168.1.254
Save the file. Add the GATEWAY= to your /etc/sysconfig/network:
# vi /etc/sysconfig/network
Append or modify GATEWAY entry:
GATEWAY=192.168.1.254
Save the file. Reboot the system or run the following command:
# ifup eth0:0
OR
# service network restart
Red Hat / CentOS / Fedora Multiple IP address range
You can assign multiple ip address range as follows to eth0:
vi /etc/sysconfig/network-scripts/ifcfg-eth0-range0
Append following code from 202.54.112.120 to 202.54.112.140:
IPADDR_START=202.54.112.120
IPADDR_END=202.54.112.140
CLONENUM_START=0
NETMASK=255.255.255.0
Save and close the file.
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