livecd~# ping 8.8.8.8

connect: Network is unreachable

livecd~# ip link set wlp4s0 up

livecd~# uname -a
  Linux livecd 3.18.12-gentoo #1 SMP Thu Jun 4 06:18:47 UTC 2015 x86_64 Intel(R) Core(TM) i3 CPU M 370 @ 2.40GHz GenuineIntel GNU/Linux

  livecd~# lspci -v -nn | grep Network -A1
  04:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N + WiMAX 6250 [Kilmer Peak] [8086:0089] (rev 5f)
Subsystem: Intel Corporation Centrino Advanced-N + WiMAX 6250 2x2 AGN [8086:1311]

ifconfig enp30s0 up
ethtool enp30s0

uname -a
# The numbers at the start and in the square brackets are the most critical pieces.
lspci -v -nn |grep Ethernet -A1
# Anything that looks non-default
dmidecode -t 1,2,3