By default Centos 6 new installation will not have network access , which means you need to configure ip address to the network interfaces by yourself.
In this article we can see how to setup network in centos 6 , i.e. assigning ipaddress in static and in DHCP mode .
Assigning ip address in DHCP mode
Step 1 » Check the network interface name by typing below command[root@leela ~]# ip a
1: lo: mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: p4p1: mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:22:19:09:4d:3c brd ff:ff:ff:ff:ff:ff
Here “lo” is the loopback interface and “p4p1” is the network interface that you need to configure .
Step 2 » you can see the file named ifcfg-p4p1 ( Interface name ) in the location “/etc/sysconfig/network-scripts/” , open the file and you can see the lines as below
DEVICE="p4p1" HWADDR="00:22:19:09:4D:3C" NM_CONTROLLED="yes" ONBOOT="no"
Just modify the lines like this
DEVICE="p4p1" HWADDR="00:22:19:09:4D:3C" NM_CONTROLLED="yes" ONBOOT="yes" # Interface enabled BOOTPROTO="dhcp" #Assigning IP from DHCP
Step 3 » Start the network service and you can see the status as below .[root@leela ~]# service network start
Bringing up loopback interface: [ OK ]
Bringing up interface p4p1:
Determining IP information for p4p1... done. [ OK ]
Step 4 » Now you can see the ip address “192.168.1.12” assigned to the interface p4p1 using dhcp .[root@leela ~]# ip a
1: lo: mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: p4p1: mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:22:19:09:4d:3c brd ff:ff:ff:ff:ff:ff
inet 192.168.1.12/26 brd 172.27.6.63 scope global p4p1
inet6 fe80::222:19ff:fe09:4b3c/64 scope link
valid_lft forever preferred_lft forever
Assigning ip address in Static mode
Step 1 » Check the network interface name by typing below command[root@leela ~]# ip a
1: lo: mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: p4p1: mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:22:19:09:4d:3c brd ff:ff:ff:ff:ff:ff
Here “lo” is the loopback interface and “p4p1” is the network interface that you need to configure .
Step 2 » you can see the file named ifcfg-p4p1 ( Interface name ) in the location “/etc/sysconfig/network-scripts/” , open the file and you can see the lines as below
DEVICE="p4p1" HWADDR="00:22:19:09:4D:3C" NM_CONTROLLED="yes" ONBOOT="no"
Just modify the lines like this
DEVICE="p4p1" HWADDR="00:22:19:09:4D:3C" NM_CONTROLLED="yes" ONBOOT="yes" # Interface enabled BOOTPROTO="static" #Assigning in static mode IPADDR=192.168.1.11 #IP address NETMASK=255.255.255.0 # Subnet Mask GATEWAY=192.168.1.1 # Default Gateway DNS1=8.8.8.8 #Primary DNS DNS2=4.2.2.2 #Secondary DNS
Step 3 » Start the network service and you can see the status as below .[root@leela ~]# service network start
Bringing up loopback interface: [ OK ]
Bringing up interface p4p1: [ OK ]
Step 4 » Now you see the ip address “192.168.1.12” assigned to the interface p4p1 .[root@leela ~]# ip a
1: lo: mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: p4p1: mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:22:19:09:4d:3c brd ff:ff:ff:ff:ff:ff
inet 192.168.1.12/26 brd 172.27.6.63 scope global p4p1
inet6 fe80::222:19ff:fe09:4b3c/64 scope link
valid_lft forever preferred_lft forever
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