I/O Ports

WAN (igb0)	LAN (igb2)
OPT1 (igb1)	OPT2 (igb3)
OPT3 (ix0)	OPT4 (ix1)

CentOS Installer NIC Label	Port
enp0s20f0	igb0
enp0s20f1	igb1
enp0s20f2	igb2
enp2s0f0	ix0
enp0s20f3	igb3
enp2s0f1	ix1