How to start network linux automatically

Step 1: Check your network

[root@PTUDServer3 ~]# ifconfig -a

eth0      Link encap:Ethernet  HWaddr 74:46:A0:98:D0:BE 

          inet addr:192.168.2.133  Bcast:10.61.118.255  Mask:255.255.255.0

          inet6 addr: fe80::7646:a0ff:fe98:d0be/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:7002 errors:0 dropped:0 overruns:0 frame:0

          TX packets:1357 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:592469 (578.5 KiB)  TX bytes:118837 (116.0 KiB)

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:16436  Metric:1

          RX packets:2456 errors:0 dropped:0 overruns:0 frame:0

          TX packets:2456 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:278546 (272.0 KiB)  TX bytes:278546 (272.0 KiB)

virbr0    Link encap:Ethernet  HWaddr 52:54:00:D9:D3:A7 

          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0

          UP BROADCAST RUNNING 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:0

          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

virbr0-nic Link encap:Ethernet  HWaddr 52:54:00:D9:D3:A7 

          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:500

          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

Step 2: Set ONBOOT=yes

[root@PTUDServer3 ~]#vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0

TYPE=Ethernet

UUID=c47a963d-3fb0-44f5-b3c7-4ff8d619a043

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=none

DEFROUTE=yes

IPV4_FAILURE_FATAL=yes

IPV6INIT=no

NAME="System eth0"

IPADDR=192.168.2.133

PREFIX=24

GATEWAY=192.168.1.1

DNS1=10.79.255.10

HWADDR=74:46:A0:98:D0:BE

DOMAIN=10.79.255.12

LAST_CONNECT=1443171251

Step 3: Start network with OS.

[root@PTUDServer3 ~]# chkconfig network on

Step 4: Test Network

[root@PTUDServer3 ~]# service network restart

Shutting down interface eth0:  Device state: 3 (disconnected)

                                                           [  OK  ]

Shutting down loopback interface:                          [  OK  ]

Bringing up loopback interface:                            [  OK  ]

Bringing up interface eth0:  Active connection state: activated

Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/1

                                                           [  OK  ]

[root@PTUDServer3 ~]# ping 8.8.8.8

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

64 bytes from 8.8.8.8: icmp_seq=1 ttl=46 time=65.6 ms

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