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Just installed CentOS 7.5 and I can't get the built-in ethernet working on my ASUS P5GC.

lspci doesn't show it and installing kmod-r8168 doesn't work either.

I've tried disabling and enabling ethernet in BIOS without success.

From what I've found it's an RTL8111c in the motherboard.

[root@p5gc ~]# lspci
00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub (rev 02)
00:01.0 PCI bridge: Intel Corporation 82945G/GZ/P/PL PCI Express Root Port (rev 02)
00:1c.0 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 1 (rev 01)
00:1d.0 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 (rev 01)
00:1d.1 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 (rev 01)
00:1d.2 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 (rev 01)
00:1d.3 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 (rev 01)
00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 01)
00:1f.2 SATA controller: Intel Corporation NM10/ICH7 Family SATA Controller [AHCI mode] (rev 01)
00:1f.3 SMBus: Intel Corporation NM10/ICH7 Family SMBus Controller (rev 01)
03:00.0 VGA compatible controller: NVIDIA Corporation GK208B [GeForce GT 710] (rev a1)
03:00.1 Audio device: NVIDIA Corporation GK208 HDMI/DP Audio Controller (rev a1)

This after install kmod-r8168 and rebooting

[root@nas1 ~]# modprobe r8168
[root@nas1 ~]# dmesg | grep r8168
[ 2596.632479] r8168: loading out-of-tree module taints kernel.
[ 2596.633934] r8168: module verification failed: signature and/or required key missing - tainting kernel

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