How to set a fixed IP address for centos to access the Internet

 

1. Modify the IP address of centos

Modify the configuration file of the corresponding Nic IP Address
# Vi/etc/sysconfig/network-scripts/ifcfg-eth0
Modify the following content
Device = eth0 # describe the device alias for the NIC, for example, it is eth0 in the ifcfg-eth0 File
Bootproto = static # Set the way for the NIC to obtain the IP address. The possible options are static, DHCP, or BOOTP, which respectively correspond to the IP address specified by the static state and the IP address obtained through the DHCP protocol, IP addresses obtained through the BOOTP protocol
Broadcast = 192.168.0.255 # corresponding subnet broadcast address
Hwaddr = 00: 07: E9: 05: E8: B4 # physical address of the corresponding Nic
Ipaddr = 12.168.1.2 # If you set the method for obtaining the IP address from the NIC to static, this field specifies the IP address of the NIC.
Ipv6init = No
Ipv6_autoconf = No
Netmask = 255.255.255.0 # network mask corresponding to the network adapter
Network = 192.168.1.0 # network address of the NIC
Onboot = yes # whether to set this network interface when the system starts. If it is set to yes, the device is activated when the system starts.

Ii. centos gateway Modification
Modify the gateway configuration file of the corresponding Nic
[[Email protected] # vi/etc/sysconfig/Network
Modify the following content
Networking = Yes (indicates whether the system uses the network, which is generally set to yes. If it is set to no, the network cannot be used, and many system service programs cannot be started)
Hostname = centos (set the Host Name of the local machine. The host name set here must correspond to the host name set in/etc/hosts)
Gateway = 192.168.1.1 (set the IP address of the gateway connected to the local machine. For example, the gateway is 10.0.0.2)

3. Modify DNS in centos
Modify the DNS configuration file of the corresponding Nic
# Vi/etc/resolv. conf
Modify the following content
Nameserver 8.8.8.8 # Google Domain Name Server
Nameserver 8.8.4.4 # Google Domain Name Server
4. Restart Network Configuration
# Service network restart
Or
#/Etc/init. d/network restart
Modify IP Address
Effective immediately:
# Ifconfig eth0 192.168.0.2 netmask 255.255.255.0
Start effective:
Modify/etc/sysconfig/network-scripts/ifcfg-eth0
Modify gateway Default Gateway
Effective immediately:
# Route add default GW 192.168.0.1 Dev eth0
Start effective:
Modify/etc/sysconfig/Network
Modify DNS
Modify/etc/resolv. conf
The modification takes effect immediately and starts as well.
Modify host name
Effective immediately:
# Hostname centos1
Start effective:
Modify/etc/sysconfig/Network

My settings:
[[Email protected]/] # Cat/etc/sysconfig/network-scripts/ifcfg-eth0
# Intel Corporation 82567lm-3 gigabit network connection
Device = eth0
Bootproto = static
Broadcast = 192.168.77.255
Hwaddr = D4: 85: 64: 94: 57: 0f
Ipaddr = 192.168.77.34
Netmask = 255.255.255.0
Network = 192.168.77.0
Onboot = Yes

[[Email protected]/] # Cat/etc/sysconfig/Network
Networking = Yes
Networking_ipv6 = No
Hostname = cloud
Gateway = 192.168.77.254

[[Email protected]/] # Cat/etc/resolv. conf
Nameserver 210.42.35.35

How to Set up a fixed IP address to access the Internet in centos)