This will assign the eth1 profile to the new network card by identifying it via its MAC address.The term MAC Address is a derived abbreviation for Media Access Control Address. Then, open up the network settings profile: nano /etc/sysconfig/network-scripts/ifcfg-eth1Īnd edit HWADDR line with the new MAC address: If this happens, change it back:Ĭtrl-O and Ctrl-X to save and exit the file.

In some cases, it may assign the network card a different name, such as eth2 instead of eth1.

In this case, the MAC address is aa:bb:cc:11:22:33. After that, replace the card and delete the persistent rules file as above.Īfter the reboot, you need to get the MAC address of the new NIC, so open up the rules file: nano /etc/udev/rules.d/lesĪnd look for the MAC address of the new NIC: Whichever MAC address changes in this file after the replacement will be the new network card. Make a quick note of MAC addresses (you do not need to write them down). Then, open up the network rules file from above: nano /etc/udev/rules.d/les First, you need to note which interface it was originally assigned (such as eth1). If you are replacing a NIC that was already configured, you do not need to re-do the entire configuration. If you are adding a new NIC, you can configure its network settings (such as IP address or gateway) with the network configuration wizard: system-config-network Replacing a NIC

While it is possible to manually edit it, it is usually simpler to just delete it and reboot the system, so it rescans network adapters attached to the system and acquires their MAC addresses. Setup the new NIC via the network configuration wizard: system-config-network SolutionĬentOS stores its current network adapter configuration in les file. Reboot and CentOS will re-acquire network adapters attached to the system. You can reset your network card configuration by deleting the /etc/udev/rules.d/les file: rm /etc/udev/rules.d/les Getting CentOS to recognize a new external network card. Add or Replace a Network Adapter (NIC) on CentOS 6

Linux centos get mac address