Arch Linux

Cookie23

Member

Registered: 2018-10-24

Posts: 11

[solved] Unable to connect through USB Ethernet

I'm on a fresh install of Archlinux (new PC), and I cannot connect to Internet via USB ethernet. On my previous PC, I used wifi with wpa_supplicant and I didn't have those problems. I'm definitely not an expert on networks.

So I first tried to find the name of my ethernet interface :

ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp8s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 18:c0:4d:dc:3e:0e brd ff:ff:ff:ff:ff:ff
3: enp9s0f3u1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 6e:e1:14:a2:51:fb brd ff:ff:ff:ff:ff:ff

I see two interfaces, enp8s0 and enp9s0f3u1 (a very long and weird name, but anyway).
So I instead run dmseg with the name of my ethernet driver, r8169

sudo dmesg | grep r8169
[    9.559141] r8169 0000:08:00.0 eth0: RTL8168h/8111h, 18:c0:4d:dc:3e:0e, XID 541, IRQ 74
[    9.559149] r8169 0000:08:00.0 eth0: jumbo features [frames: 9194 bytes, tx checksumming: ko]
[   10.193430] r8169 0000:08:00.0 enp8s0: renamed from eth0

So it uses enp8s0 instead of eth0 from what I understand. Ok, so I run :

sudo ip link set dev enp8s0 up

It is up now. Then :

sudo dhcpcd enp8s0

That last command throws "waiting for carrier", then "timed out". And I don't know what to do next.

Last edited by Cookie23 (2022-07-14 02:43:33)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,671

Re: [solved] Unable to connect through USB Ethernet

wpa_supplicant is really for use by wireless networks. 

As to the weird names:  https://access.redhat.com/documentation … vice_names

enp8s0 means Wired Ethernet, someplace on the PCI bus.
enp9s0f3u1 means Wired Ethernet on on USB device.

I imagine you have the cable attached to enps0f3u1 as we are discussing a USB interface.  You tried to bring up the other interface that is somewhere on the PCI bus (probably intrinsic to your motherboard)

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Cookie23

Member

Registered: 2018-10-24

Posts: 11

Re: [solved] Unable to connect through USB Ethernet

"wpa_supplicant is really for use by wireless networks." -> I've said it was for my wifi

Thanks ! I should have tried enp9s0f3u1, maybe I shouldn't install arch in the middle of the night instead of sleeping.