CentOS 6
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Networking Settings
2014/08/01
[1] Set the static IP address to the server.
[root@dlp ~]#
vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=00:50:43:00:3B:AE
TYPE=Ethernet
UUID=c1539085-73d7-4455-ac82-88f26464458a
# change

ONBOOT=
yes

NM_CONTROLLED=yes
# change

BOOTPROTO=
none

# add follows

# this server's IP address

IPADDR=10.0.0.30
# subnet mask

NETMASK=255.255.255.0
# default gateway

GATEWAY=10.0.0.1
# DNS server's IP address

DNS1=10.0.0.10
IPV6INIT=no
USERCTL=no
[root@dlp ~]#
/etc/rc.d/init.d/network restart

Shutting down interface eth0:
[  OK  ]

Shutting down loopback interface:
[  OK  ]

Bringing up loopback interface:
[  OK  ]

Bringing up interface eth0:
[  OK  ]

[root@dlp ~]#
chkconfig network on

[root@dlp ~]#
eth0
Link encap:Ethernet HWaddr 00:0C:29:D8:7C:06

inet addr:10.0.0.30 Bcast:10.0.0.255 Mask:255.255.255.0

inet6 addr: fe80::20c:29ff:fed8:7c06/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:885 errors:0 dropped:0 overruns:0 frame:0

TX packets:743 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

 
RX bytes:83054 (81.1 KiB) TX bytes:113706 (111.0 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: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)

[2] Disable IPv6 if you don't need it.
[root@dlp ~]#
eth0
Link encap:Ethernet HWaddr 00:0C:29:D8:7C:06

inet addr:10.0.0.30 Bcast:10.0.0.255 Mask:255.255.255.0

inet6 addr: fe80::20c:29ff:fed8:7c06/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:885 errors:0 dropped:0 overruns:0 frame:0

TX packets:743 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

 
RX bytes:83054 (81.1 KiB) TX bytes:113706 (111.0 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: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)

[root@dlp ~]#
vi /etc/sysctl.conf
# add follows to the end

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
# apply new settings

[root@dlp ~]#
sysctl -p
[root@dlp ~]#
eth0
Link encap:Ethernet HWaddr 00:0C:29:D8:7C:06

inet addr:10.0.0.30 Bcast:10.0.0.255 Mask:255.255.255.0

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:885 errors:0 dropped:0 overruns:0 frame:0

TX packets:743 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

 
RX bytes:83054 (81.1 KiB) TX bytes:113706 (111.0 KiB)
lo
Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

UP LOOPBACK RUNNING MTU:16436 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)

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