Arch Linux

99lives

Member

Registered: 2015-09-28

Posts: 15

[SOLVED] Cannot access Ethernet or network controller

After a seamless Arch install I am unable to establish a wired or wireless internet connection.

So during my first Arch Linux install (after a few years on Ubuntu), I encounter an issue when trying to establish an internet connection. After some searching I find the issue is to do with my laptop having the Broadcom BCM57780 chipset. So I follow these instructions

modprobe -r tg3

modprobe broadcom

modprobe tg3

Ping google again and get it works great. Finish installation with no issues (woo-hoo!)
Boot into my new shiny Arch system and ping google, this fails, as expected. Do the modprobe commands again, exactly as before, ping google and it fails!
I decide to boot back into the flash drive I used to install Arch to check the connection: ping fails, modprobe commands, ping succeeds.
But on the Arch installation on my PC: ping fails, modprobe commands, ping fails again.

Upon further investigation I find that the broadcom and tg3 modules appear to be loaded automatically at boot on the laptop installation, but not the flash drive installation. The module issue seems to only apply to the flash drive, the issue is completely different for the laptop.

"ip link show" returns the following:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp4s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 08:9e:01:5d:31:08 brd ff:ff:ff:ff:ff:ff
3: wlp9s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000 link/ether c8:f7:33:2f:3d:3e brd ff:ff:ff:ff:ff:ff

I believe that 'enp4s0' is my wired interface and 'wlp9s0' the wired

and "lspci -v" this:

04:00.0
Ethernet controller: Broadcom Corporation NetLink BCM57780 Gigabit Ethernet PCIe (rev 01)
Subsystem: Acer Incorporated [ALI] Device 0712
Flags: bus master, fast devsel, latency 0, IRQ 18
Memory at c2500000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: tg3
Kernel modules: tg3

09:00.0
Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 24)
Subsystem: Intel Corporation Centrino Advanced-N 6235 AGN
Flags: bus master, fast devsel, latency 0, IRQ 30
Memory at c2400000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi

I also installed KDE plasma via my flash drive, since I can connect to the internet from it. In the little Network Interfaces app, neither enp4s0 nor wlp9s0 show up, only 'lo'.

I would really appreciate any help, I am so painfully close to having my first fully functional Arch install.

UPDATE:
Nevermind, I figured it out.
I simply didn't have any network managers enabled, rookie mistakes but hey

Last edited by 99lives (2015-09-28 07:44:46)