There may be a problem with the network configuration file. Check the mac address of the eth0 network card
ifconfig eth0
(The hexadecimal information after HWaddr is the mac address)
Then take a look at the corresponding configuration file, /etc/sysconfig/network-scripts/ifcfg-eth0
more /etc/sysconfig/network-scripts/ifcfg-eth0
If the mac address obtained in the first step is not consistent with the one in the configuration file, you can try to modify the configuration file. Then, delete /etc/udev/rules.d/70-persistent-net.rules. (For the function of /etc/udev/rules.d/70-persistent-net.rules, please refer to udev)
Restart the system and check whether eth0 is loaded normally.
The above is my centos method. I have not tried it on other Linux. If it does not work, please understand.
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lo is the loopback network card, and 127.0.0.1 is the loopback address.
There may be a problem with the network configuration file.
Check the mac address of the eth0 network card
(The hexadecimal information after HWaddr is the mac address)
Then take a look at the corresponding configuration file, /etc/sysconfig/network-scripts/ifcfg-eth0
If the mac address obtained in the first step is not consistent with the one in the configuration file, you can try to modify the configuration file.
Then, delete /etc/udev/rules.d/70-persistent-net.rules.
(For the function of /etc/udev/rules.d/70-persistent-net.rules, please refer to udev)
Restart the system and check whether eth0 is loaded normally.
The above is my centos method. I have not tried it on other Linux. If it does not work, please understand.
Agree with the above, add a new network card, and then start it again.