wiki name: HavardSorli Page for update : https://wiki.centos.org/FAQ/CentOS7 some notes / comments / open points to: FAQ "4. .... want it to work and to hand-edit the configuration files." My user case: "Adding an extra ip to the same interface" in the "old days" an alias. ( I am not sure if this should be an extra faq question, or incorporated in FAQ 4) I have used some time on this matter, and there are lot of suggestions, and probably also half way correct but misleading information. One direction is to disable NetworkManager and make aliases the old way (copy the ifcfg-ethX file to ifcfg-ethX:X and do some changes). I got it to work, but only with "ifup ethX:X". I did´t get ethX:X to start during boot. I stopped testing it, and got back to use nmtui. The other direction in in a non-graphical environment is to use NetworkManager with nmtui. Adding the extra ip on the same interface with nmtui, does the trick. I does not show up with ifconfig... but with the "new" "ip addr" What happens in the config file when you use nmtui and add an extra ip: ( extract from /etc/sysconfig/network-scripts/ifcfg-eth0 ) IPADDR=1.192.168.132 PREFIX=24 IPADDR1=1.192.168.140 PREFIX1=24 GATEWAY=1.192.168.1 Note the extra IPADDR1 and PREFIX1 Tested on Centos 7.2 I did not test if the extra the extra IPADDR1 and PREFIX1 would fix the "load on boot problem" without NetworkManager, but maybe some others have some input on that matter. I think some pros / cons information on this matter would have been nice for new readers. It will then be easier to make a choice based on knowledge, not assumptions. Disable og not disable NetworkManager : What do you lose? (main points) - integration with the firewalld package <add more info> - <add more info> It my be worth to mention the package NetworkManager-tui and the nmtui tool as an alternative to nm-connection-editor and nm-applet in a non-graphical environment. -- Havard Sorli