Linux: CentOS7 Nic settings (P1), centos7p1

Linux: CentOS7 Nic settings (P1), centos7p1

You can set the NIC in Linux in several ways.

• Method 1: Enter setup
• Method 2: modify the configuration file

 

We recommend that you modify the configuration file for network configuration. The following describes the configuration process of CentOS7 in VirtualBox.

 

Configuration File Effective sequence:

 

Configuration instance:

Vi/etc/sysconfig/network-scripts/ifcfg-enp0s3 use vi to modify TYPE = EthernetBOOTPROTO = staticDEFROUTE = yesPEERDNS = yesDNS1 = protocol 255.255.0gateway = protocol = noNAME = enp0s3UUID = 08b69929-afd0-4310-baf2-fc376f251f36DEVICE = enp0s3ONBOOT = yes

 

Configuration instructions:

Parameter values are case-insensitive, single quotes and double quotation marks, or even quotation marks are not required.

• TYPE: Ethernet, IPsec
• DEVICE: Network Interface Name
• BOOTPROTO: system startup address protocol

None: Do not use the startup address protocol

Bootp: Use the BOOTP protocol

Dhcp: Use the dhcp protocol.

Static: static address protocol

• ONBOOT: whether the system is activated at startup

Yes: Activation

No: inactive

• IPADDR: IP Address
• NETMASK: Subnet Mask
• GATEWAY: GATEWAY address
• BROADCAST: BROADCAST address
• HWADDR/MACADDR: MAC address. You only need to set one address and cannot conflict with each other.
• PEERDNS: Specifies whether to use DNS. If DHCP protocol is used, the default value is yes.

Yes: If DNS is set, modify the DNS in/etc/resolv. confg.

No: do not modify DNS in/etc/resolv. confg

• DNS1/DNS2: When PEERDNS is set to yes, it will be written to/etc/resolv. conf.
• NM_CONTROLLED: whether the Network interface is controlled by Network Manager. The interface takes effect immediately after the modification is saved. We recommend that you set it to no

Yes: Controlled by Network Manager

No: not controlled by Network Manager

• USERCTL: user permission Control

Yes: Non-root users are allowed to control this network interface.

No: Non-root users are not allowed to control this network interface.

• IPV6INIT: whether to execute IPv6

Yes: IPv6 is supported.

No: IPv6 is not supported.

• IPV6ADDR: IPv6 address/prefix length

 

 

Stop, start, and restart the NIC Service

• Stop

Systemctl stop network. service or systemctl stop network

　　

• Start

Systemctl start network. service or systemctl start network

　　

• Restart

Systemctl restart network. service or systemctl restart network

　　

Note: CentOS6 restart command

service network restart

　　

 

DNS Configuration

Note: If the PEERDNS parameter is yes and DNS1 and DNS2 are configured in the network port information, the DNS information will be written to/etc/resolv. in conf,/etc/resolv. the DNS in conf will be invalid.

 

/Etc/resolv. conf configure the instance nameserver 202.96.128.86 nameserver 202.96.128.166nameserver 8.8.8.8

　　

It is recommended to set in the network port

PEERDNS=yesDNS1=202.96.128.86DNS2=202.96.128.166

　　

Common network test commands

 

Ping a domain name or ip address -- test network connectivity

Host domain name-test DNS explanation

Dig domain name-test DNS explanation

Ip route -- display route table

Traceroute www.baidu.com -- trace the network path to the target address

Mtr www.baidu.com -- use mtr for network quality testing (combined with traceroute and ping)