CentOS7.1 Nic settings

CentOS7.1 Nic settings

Today, I installed CentOS7.1, and found that it was very different from that before 6. The command changed a lot and the network configuration was not as good as that.

Next I will introduce the NIC configuration in 7, including the problems I encountered.

After the VM is installed

Run ifconfig

You will find that the NIC information has changed.

# Ifconfig

Eno16777736: flags = 4163 <UP, BROADCAST, RUNNING, MULTICAST> mtu 1500

Inet 192.168.66.104 netmask 255.255.255.0 broadcast 192.168.66.255

Inet6 fe80: 20c: 29ff: fe8f: 994b prefixlen 64 scopeid 0x20 <link>

Ether 00: 0c: 29: 8f: 99: 4b txqueuelen 1000 (Ethernet)

RX packets 94480 bytes 139993185 (133.5 MiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 38775 bytes 2602634 (2.4 MiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

The original eth0/eh1 has become the current enoxxxxxxx (I really want to vomit blood after reading it)

First, go to/etc/sysconfig/network-scripts, find the configuration file of ifcfg-enoxxxxxx Nic, and modify it to the following format.

HWADDR = 00: 0c: 29: 8f: 99: 4b // Nic MAC address

TYPE = Ethernet

BOOTPROTO = static // dhcp is used by default, and static indicates static IP.

DEFROUTE = yes

PEERDNS = yes

PEERROUTES = yes

20174_failure_fatal = yes

NAME = eno16777736 // Nic NAME

UUID = 94271989-6217-457d-a88f-40fb635af64c // UUID. Do not change it if you are fine. Otherwise, you will regret it ..

# DEVICE = eno16777736

ONBOOT = yes // automatically start upon startup

IPADDR = 192.168.66.2 // ip address

NETNASK = 255.255.255.0 // Subnet Mask

GATEWAY = 192.168.66.1 // GATEWAY

DNS1 = 8.8.8.8 // DNS

# DEVICE = eth0

After modifying the configuration file, run the following command to confirm the NIC information you have set.

Use the nmtui text tool to modify the network configuration (RHEL7/CentOS7 is installed by default, which can be used only when NetworkManager. service is enabled)

# Nmtui-edit enoxxxxxxx

Connect and the connection will be OK when the connection is successful.

# Nmtui-connect enoxxxxxxxx

During this period, the friends did not know if they would have encountered the problem of having no HWADDR parameter in the NIC configuration file, which is what we call the MAC address. Anyway, I encountered it and had trouble me for ten minutes. Finally, I solved it.

This is the problem.

[Root @ localhost ~] # Systemctl restart network

Job for network. service failed. See 'systemctl status network. service' and 'journalctl-xn 'for details.

This error occurs because the MAC address parameters in your configuration file are different from those in ifconfig. The solution is:

# Ifconfig

Eno16777736: flags = 4163 <UP, BROADCAST, RUNNING, MULTICAST> mtu 1500

Inet 192.168.66.104 netmask 255.255.255.0 broadcast 192.168.66.255

Inet6 fe80: 20c: 29ff: fe8f: 994b prefixlen 64 scopeid 0x20 <link>

Ether00: 0c: 29: 8f: 99: 4 btxqueuelen 1000 (Ethernet)

RX packets 94480 bytes 139993185 (133.5 MiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 38775 bytes 2602634 (2.4 MiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

Write the ipv4 MAC address printed above to the NIC configuration file, and then restart it to avoid this problem. Of course, IPV6 also says

Modify host name:

Vi/etc/hostname

Save and log on again

# Hostname

Control