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Add network card in CentOS can not identify how to solve, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

1. When ifconfig is executed after the newly added network card is added, the system does not recognize

The code is as follows:

# ifconfig

two。 Get the real mac of the newly added Nic

The code is as follows:

# ip addr

3. Copy eth0 to eth2 and modify the configuration file

The code is as follows:

# cd / etc/sysconfig/network-scripts

# cp ifcfg-eth0 ifcfg-eth2

# vim ifcfg-eth2

The contents to be modified are:

HWADD is obtained through ip addr

UUID. I didn't find UUID. I can comment it out.

NAME is changed to the name of the current network card eth2

DEVICE is changed to the name of the current network card eth2

IPADDR,GATEWAY et al.

Save exit

4. Restart the network card and you can see that it has been obtained.

The code is as follows:

# systemctl restart network

# ifconfig

Change the name of the network card in PS:centos7 to eth0

Because I often switch between centos6 and centos7 systems, I feel that the network card name of centos7 is too long and inconvenient, so I want to make it the same as 6.

If you want to change the name of the network card to the same eth0,eth2 as 6, do the following

1.

The code is as follows:

# cd / etc/sysconfig

two。 Add the following sentence to the longest line

The code is as follows:

# vim grub

Net.ifnames=0 biosdevname=0

3.

The code is as follows:

# grub2-mkconfig-o / boot/grub2/grub.cfg

4. Rename the original network card name

The code is as follows:

# cd / etc/sysconfig/network-scripts

# mv ifcfg-enoXXXXXXXX ifcfg-eth0

5. Change the name of NAME,DEVICE in ifcfg-eth0 to eth0.

The code is as follows:

NAME=eth0

DEVICE=eth0

6.reboot and check to find that it has become the eth0 we want

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