Configuring IP Address on Centos 6.7

CK 3788
Created at Nov 08, 2015 13:21:50
Updated at Oct 30, 2024 15:11:53

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On Centos 6.7, you can check IP address configuration by ifconfig command as below:

# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:E0:4C:68:00:67
          inet addr:192.168.10.9  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fe80::2e0:4cff:fe68:67/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:288051 errors:0 dropped:0 overruns:0 frame:0
          TX packets:461463 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:24436277 (23.3 MiB)  TX bytes:599160385 (571.4 MiB)

eth1      Link encap:Ethernet  HWaddr 00:E0:4C:68:00:68
          inet addr:192.168.10.9  Bcast:192.168.10.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 b)  TX bytes:560 (560.0 b)

The below is the example of files on "/etc/sysconfig/network-scripts"

# cd /etc/sysconfig/network-scripts
# cd ls -Fal
total 220
drwxr-xr-x. 2 root root 4096 Oct 31 06:52 ./
drwxr-xr-x. 7 root root 4096 Nov 2 21:50 ../
-rw-r--r--. 1 root root 180 Oct 31 06:52 ifcfg-eth0
-rw-r--r--. 1 root root 180 Oct 31 06:44 ifcfg-eth1
-rw-r--r--. 1 root root 254 Apr 10 2015 ifcfg-lo
-rw-r--r--. 1 root root 137 Oct 31 06:34 ifcfg-wlan0
lrwxrwxrwx. 1 root root 20 Oct 31 06:34 ifdown -> ../../../sbin/ifdown*
-rwxr-xr-x. 1 root root 627 Apr 10 2015 ifdown-bnep*
-rwxr-xr-x. 1 root root 5594 Apr 10 2015 ifdown-eth*
-rwxr-xr-x. 1 root root 781 Apr 10 2015 ifdown-ippp*
-rwxr-xr-x. 1 root root 4168 Apr 10 2015 ifdown-ipv6*
lrwxrwxrwx. 1 root root 11 Oct 31 06:34 ifdown-isdn -> ifdown-ippp*
-rwxr-xr-x. 1 root root 1617 Apr 10 2015 ifdown-post*
-rwxr-xr-x. 1 root root 1064 Apr 10 2015 ifdown-ppp*
-rwxr-xr-x. 1 root root 835 Apr 10 2015 ifdown-routes*
-rwxr-xr-x. 1 root root 1465 Apr 10 2015 ifdown-sit*
-rwxr-xr-x. 1 root root 1434 Apr 10 2015 ifdown-tunnel*
lrwxrwxrwx. 1 root root 18 Oct 31 06:34 ifup -> ../../../sbin/ifup*
-rwxr-xr-x. 1 root root 12589 Apr 10 2015 ifup-aliases*
-rwxr-xr-x. 1 root root 859 Apr 10 2015 ifup-bnep*
-rwxr-xr-x. 1 root root 10948 Apr 10 2015 ifup-eth*
-rwxr-xr-x. 1 root root 11971 Apr 10 2015 ifup-ippp*
-rwxr-xr-x. 1 root root 10490 Apr 10 2015 ifup-ipv6*
lrwxrwxrwx. 1 root root 9 Oct 31 06:34 ifup-isdn -> ifup-ippp*
-rwxr-xr-x. 1 root root 727 Apr 10 2015 ifup-plip*
-rwxr-xr-x. 1 root root 954 Apr 10 2015 ifup-plusb*
-rwxr-xr-x. 1 root root 2364 Apr 10 2015 ifup-post*
-rwxr-xr-x. 1 root root 4154 Apr 10 2015 ifup-ppp*
-rwxr-xr-x. 1 root root 1925 Apr 10 2015 ifup-routes*
-rwxr-xr-x. 1 root root 3289 Apr 10 2015 ifup-sit*
-rwxr-xr-x. 1 root root 2563 Apr 10 2015 ifup-tunnel*
-rwxr-xr-x. 1 root root 3951 Apr 10 2015 ifup-wireless*
-rwxr-xr-x. 1 root root 4623 Apr 10 2015 init.ipv6-global*
-rwxr-xr-x. 1 root root 1219 Apr 10 2015 net.hotplug*
-rw-r--r--. 1 root root 14644 Apr 10 2015 network-functions
-rw-r--r--. 1 root root 29853 Apr 10 2015 network-functions-ipv6

Among above, ifcfg-eth0 and ifcfg-eth1 is wired network, and below is the reference example:

DEVICE=eth0
HWADDR=00:E0:4C:68:00:67
TYPE=Ethernet
UUID=c648a3e3-406d-4144-8f5c-4ba7187cf63a
ONBOOT=yes
NM_CONTROLLED=yes
#BOOTPROTO=dhcp
IPADDR=192.168.10.9
NETMASK=255.255.255.0

If you haven't set DNS configuration, you should add DNS at /etc/resolv.conf as following:

nameserver 168.126.63.1
nameserver 168.126.63.2
nameserver 8.8.8.8
nameserver 8.8.4.4

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