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#1 2019-06-04 09:55:47

archietux
Member
Registered: 2019-05-25
Posts: 9

Ethernet connection not working

Greetings fellow users,

As stated in the topic, my ethernet connection doesn't seem to work and since I'm pretty much a newbie when it comes to networking, I would very much appreciate assistance. This post may seem a duplicate of this one: https://bbs.archlinux.org/viewtopic.php … 2#p1753842
However, disabling IPv6 didn't fix my problem. I use NetworkManager and it  handles wifi with no problems.

Some info:
ip link

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: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 00:13:77:e6:63:d8 brd ff:ff:ff:ff:ff:ff
3: wlp2s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DORMANT group default qlen 1000
    link/ether 5e:68:a9:f1:81:dd brd ff:ff:ff:ff:ff:ff

lspci -v

04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller (rev 02)
	Subsystem: Samsung Electronics Co Ltd RTL810xE PCI Express Fast Ethernet controller
	Flags: bus master, fast devsel, latency 0, IRQ 19
	I/O ports at 3000 [size=256]
	Memory at f4000000 (64-bit, prefetchable) [size=4K]
	Memory at f2000000 (64-bit, prefetchable) [size=64K]
	[virtual] Expansion ROM at f8000000 [disabled] [size=128K]
	Capabilities: [40] Power Management version 3
	Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
	Capabilities: [70] Express Endpoint, MSI 01
	Capabilities: [ac] MSI-X: Enable+ Count=2 Masked-
	Capabilities: [cc] Vital Product Data
	Capabilities: [100] Advanced Error Reporting
	Capabilities: [140] Virtual Channel
	Capabilities: [160] Device Serial Number 01-00-00-00-00-00-00-00
	Kernel driver in use: r8169
	Kernel modules: r8169

dmesg | grep r8169

[   25.071781] r8169 0000:04:00.0: can't disable ASPM; OS doesn't have ASPM control
[   25.137550] libphy: r8169: probed
[   25.137845] r8169 0000:04:00.0 eth0: RTL8102e, 00:13:77:e6:63:d8, XID 24c, IRQ 25
[   25.813078] r8169 0000:04:00.0 enp4s0: renamed from eth0
[   38.118407] RTL8201CP Ethernet r8169-400:00: attached PHY driver [RTL8201CP Ethernet] (mii_bus:phy_addr=r8169-400:00, irq=IGNORE)
[   38.214422] r8169 0000:04:00.0 enp4s0: Link is Down
[   39.748479] r8169 0000:04:00.0 enp4s0: Link is Up - 100Mbps/Full - flow control rx/tx
[   60.583264] r8169 0000:04:00.0 enp4s0: Link is Down
[   69.991831] r8169 0000:04:00.0 enp4s0: Link is Up - 100Mbps/Full - flow control rx/tx
[   70.867939] r8169 0000:04:00.0 enp4s0: Link is Down
[   72.487495] r8169 0000:04:00.0 enp4s0: Link is Up - 100Mbps/Full - flow control rx/tx
[   73.300619] r8169 0000:04:00.0 enp4s0: Link is Down
[   85.270736] r8169 0000:04:00.0 enp4s0: Link is Up - 100Mbps/Full - flow control rx/tx

and journalctl NetworkManager

Jun 04 11:40:05 arch NetworkManager[750]: <warn>  [1559641205.7934] device (enp4s0): Activation: failed for connection 'Wired connection 1'
Jun 04 11:40:05 arch NetworkManager[750]: <info>  [1559641205.7951] device (enp4s0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
Jun 04 11:40:05 arch NetworkManager[750]: <info>  [1559641205.8007] policy: auto-activating connection 'Wired connection 1' (b8420f15-12eb-3003-8c5c-77f6c978ef25)
Jun 04 11:40:05 arch NetworkManager[750]: <info>  [1559641205.8035] device (enp4s0): Activation: starting connection 'Wired connection 1' (b8420f15-12eb-3003-8c5c-77f6c978ef25)
Jun 04 11:40:05 arch NetworkManager[750]: <info>  [1559641205.8057] device (enp4s0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Jun 04 11:40:05 arch NetworkManager[750]: <info>  [1559641205.8119] manager: NetworkManager state is now CONNECTING
Jun 04 11:40:05 arch NetworkManager[750]: <info>  [1559641205.8133] device (enp4s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Jun 04 11:40:05 arch NetworkManager[750]: <info>  [1559641205.8153] device (enp4s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Jun 04 11:40:05 arch NetworkManager[750]: <info>  [1559641205.8168] dhcp4 (enp4s0): activation: beginning transaction (timeout in 45 seconds)
Jun 04 11:40:07 arch NetworkManager[750]: <warn>  [1559641207.7751] ndisc[0x3d78391e560,"enp4s0"]: failure sending router solicitation: Operation not permitted (1)
Jun 04 11:40:50 arch NetworkManager[750]: <warn>  [1559641250.7757] dhcp4 (enp4s0): request timed out
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.7758] dhcp4 (enp4s0): state changed unknown -> timeout
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.7890] dhcp4 (enp4s0): canceled DHCP transaction
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.7891] dhcp4 (enp4s0): state changed timeout -> done
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.7897] device (enp4s0): state change: ip-config -> failed (reason 'ip-config-unavailable', sys-iface-state: 'managed')
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.7918] manager: NetworkManager state is now DISCONNECTED
Jun 04 11:40:50 arch NetworkManager[750]: <warn>  [1559641250.7927] device (enp4s0): Activation: failed for connection 'Wired connection 1'
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.7934] device (enp4s0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.8087] policy: auto-activating connection 'Wired connection 1' (b8420f15-12eb-3003-8c5c-77f6c978ef25)
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.8127] device (enp4s0): Activation: starting connection 'Wired connection 1' (b8420f15-12eb-3003-8c5c-77f6c978ef25)
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.8143] device (enp4s0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.8205] manager: NetworkManager state is now CONNECTING
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.8232] device (enp4s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.8270] device (enp4s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Jun 04 11:40:50 arch NetworkManager[750]: <info>  [1559641250.8305] dhcp4 (enp4s0): activation: beginning transaction (timeout in 45 seconds)
Jun 04 11:40:52 arch NetworkManager[750]: <warn>  [1559641252.7758] ndisc[0x3d78391e560,"enp4s0"]: failure sending router solicitation: Operation not permitted (1)
Jun 04 11:41:35 arch NetworkManager[750]: <warn>  [1559641295.7757] dhcp4 (enp4s0): request timed out
Jun 04 11:41:35 arch NetworkManager[750]: <info>  [1559641295.7758] dhcp4 (enp4s0): state changed unknown -> timeout
Jun 04 11:41:35 arch NetworkManager[750]: <info>  [1559641295.7890] dhcp4 (enp4s0): canceled DHCP transaction
Jun 04 11:41:35 arch NetworkManager[750]: <info>  [1559641295.7891] dhcp4 (enp4s0): state changed timeout -> done
Jun 04 11:41:35 arch NetworkManager[750]: <info>  [1559641295.7899] device (enp4s0): state change: ip-config -> failed (reason 'ip-config-unavailable', sys-iface-state: 'managed')
Jun 04 11:41:35 arch NetworkManager[750]: <info>  [1559641295.7910] manager: NetworkManager state is now DISCONNECTED
Jun 04 11:41:35 arch NetworkManager[750]: <warn>  [1559641295.7916] device (enp4s0): Activation: failed for connection 'Wired connection 1'
Jun 04 11:41:35 arch NetworkManager[750]: <info>  [1559641295.7920] device (enp4s0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')

I tried to disable IPv6 to see if that would fix my problem. I created 

/etc/sysctl.d/40-ipv6.conf

and inserted:

# Disable IPv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.enp4s0.disable_ipv6 = 1

There are a couple warnings in the NetworkManager journalctl entry but I don't understand what exactly the problem is, probably because I don't rightly understand what's going on under the networking hood. I would really appreciate some help.

On a side note: I have a VPN client running in the background which usually blocks internet connections when it's not on but even when I disable the thing, my connection won't work.

Last edited by archietux (2019-06-04 10:00:43)

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#2 2019-06-04 16:52:02

Zod
Member
From: Hoosiertucky
Registered: 2019-03-10
Posts: 636

Re: Ethernet connection not working

You might confirm that you have a link light on your Nic and the port that it's connected to. You might also swap out the ethernet cable.

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#3 2019-06-11 10:05:06

archietux
Member
Registered: 2019-05-25
Posts: 9

Re: Ethernet connection not working

Zod wrote:

You might confirm that you have a link light on your Nic and the port that it's connected to. You might also swap out the ethernet cable.

Did that, didn't help. The same ethernet cable and port work with another machine.

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#4 2019-06-11 12:34:24

Head_on_a_Stick
Member
From: The Wirral
Registered: 2014-02-20
Posts: 9,003
Website

Re: Ethernet connection not working

https://aur.archlinux.org/packages/r8101-dkms/?

Jin, Jîyan, Azadî

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