[SOLVED] Stuck configuring enp*s* network interface

mgoblue0970 · 06-11-2018, 05:50 PM

Hello:

Before posting, I looked at this: https://wiki.centos.org/FAQ/CentOS7#...dd5315906fa493 No help.

Running CentOS 7 here. I have two NICs... they are now named enp0s3 and enp0s8 rather than eth0 and eth1.

For enp0s8 I do NOT want it to autostart. I want to be able to bring it up or down on demand just like in the good 'ol days with ifup/ifdown or ifconfig eth0 up/down.

Those commands may have worked on eth0 but not on enp0s8.

1. What are the commands to bring up or down enp0s8 from the terminal?

Also, I've noticed /etc/sysconfig/network and the network-scripts (for ifcfg-ethN files) are gone.

2. What replaced them? Surely there has to be a file based way I can manage the interfaces -- and WITHOUT using nmtui?!

Thanks in advance for any assistance!

scasey · 06-11-2018, 06:52 PM

On my desktop, there are files in /etc/sysconfig/network-scripts/ :

Code:

-rw-------. 1 root root   396 Feb  5 17:03 ifcfg-enp3s0
-rw-r--r--. 1 root root   254 May  3  2017 ifcfg-lo
lrwxrwxrwx. 1 root root    24 Feb  6 12:53 ifdown -> ../../../usr/sbin/ifdown
lrwxrwxrwx. 1 root root    22 Feb  6 12:53 ifup -> ../../../usr/sbin/ifup

Code:

ifdown enp3s0

will bring the NIC down, and

Code:

ifup enp3s0

will bring it back up.
Each NIC will (should) have an ifcfg-* in /etc/sysconfig/network-scripts/ and

Code:

systemctl start network.service

or a reboot will startup both NICs.
Setting the

Code:

ONBOOT=no

inside ifcfg-enp8s0 should prevent it from starting at boot, but I'm not sure if that will keep it from responding to a

Code:

systemctl restart network.service

...and only have one NIC on my pc to test with.

So: The commands are the same, but substitute the new name of the NIC for eth0/1

FWIW, on my headless server, I copied the ifcfg-* files from the old server, which preserved the eth0 name, because the name is one of the values in the ifcfg files. Still only one NIC there, tho, too.

PS: That link you posted says all of the above...wish I'd looked at it first

mgoblue0970 · 06-12-2018, 11:22 AM

You got me on the /etc/sysconfig/network-scripts/, I was mistaken on the proper path to the config files.

However, ifup enp0s8 is not working. It times out after a few minutes without bringing up the interface.

I used nmtui to configure enp0s8. Now that I have the proper path, I went and looked at it. Even though I speficied a staid IP address, the ifcfg-enp0s8 has this:

BOOTPROTO=dhcp

with this later in the file:

IPADDR=10.242.34.100

Ugh. So I changed BOOTPROTO to static.

I also added:

NM_CONTROLLED=no

ifup enp0s8 now works.

Thanks for your assistance.

scasey · 06-12-2018, 02:18 PM

Happy to help. Please use the Thread Tools to mark the thread Solved.