Unable to connect to Internet via Ethernet

gear4 · 2017-09-04 11:42:36

Hi!

I installed Arch 3-4 months ago and have been using Wi-Fi so far. I've been trying to connect to the Internet via LAN connection for a few weeks, but so far haven't been able to.

sudo systemctl start dhcpcd@enp4s0.service
gives
Job for dhcpcd@enp4s0.service failed because the service did not take the steps required by its unit configuration.
See "systemctl status dhcpcd@enp4s0.service" and "journalctl -xe" for details.

Journalctl gives

Sep 04 17:06:23 gear4 dhcpcd[26233]: control command: /usr/bin/dhcpcd -q -w enp4s0
Sep 04 17:06:23 gear4 systemd[1]: dhcpcd@enp4s0.service: PID file /run/dhcpcd-enp4s0.pid not readable (yet?) after start: No such file or directory
Sep 04 17:06:23 gear4 systemd[1]: Failed to start dhcpcd on enp4s0.
-- Subject: Unit dhcpcd@enp4s0.service has failed
-- Unit dhcpcd@enp4s0.service has failed.
Sep 04 17:06:23 gear4 systemd[1]: dhcpcd@enp4s0.service: Unit entered failed state.
Sep 04 17:06:23 gear4 systemd[1]: dhcpcd@enp4s0.service: Failed with result 'protocol'.

Please help me fix this! Thanks

seth · 2017-09-04 12:25:21

Check whether you've got an ethernet interface at all and with what name. If not, check for the ethernet pci or usb device and which module it's supposed to use, then whether that module is loaded.
Check whether you can get that interface up and whether you can get a lease using dhclient rather than dhcpcd.
Also you're apparently using WiFi. How?

systemctl list-units | grep -iE '(dhcp|net|wicd|conn)'

And share your findings.

gear4 · 2017-09-04 12:46:48

seth wrote:

Check whether you've got an ethernet interface at all and with what name. If not, check for the ethernet pci or usb device and which module it's supposed to use, then whether that module is loaded.
Check whether you can get that interface up and whether you can get a lease using dhclient rather than dhcpcd.
Also you're apparently using WiFi. How?
systemctl list-units | grep -iE '(dhcp|net|wicd|conn)'
And share your findings.

----

Ethernet name:

2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether f4:8e:38:ed:21:11 brd ff:ff:ff:ff:ff:ff

Running
 dhclient enp4s0  
connects to the wired network but still can't access the internet.

systemctl list-units | grep -iE '(dhcp|net|wicd|conn)'

gives

  sys-devices-pci0000:00-0000:00:1c.4-0000:04:00.0-net-enp4s0.device                        loaded active     plugged      RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller                  
  sys-devices-pci0000:00-0000:00:1c.5-0000:05:00.0-net-wlp5s0.device                        loaded active     plugged      Wireless 3165                                                              
  sys-subsystem-net-devices-enp4s0.device                                                   loaded active     plugged      RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller                  
  sys-subsystem-net-devices-wlp5s0.device                                                   loaded active     plugged      Wireless 3165                                                              
  sys-fs-fuse-connections.mount                                                             loaded active     mounted      FUSE Control File System                                                   
  dhcpcd.service                                                                            loaded active     running      dhcpcd on all interfaces                                                   
● dhcpcd@enp4s0.service                                                                     loaded failed     failed       dhcpcd on enp4s0                                                           
  netctl.service                                                                            loaded active     exited       (Re)store the netctl profile state                                         
● netctl@ethernet\x2ddhcp.service                                                           loaded failed     failed       Networking for netctl profile ethernet-dhcp                                
  NetworkManager.service                                                                    loaded active     running      Network Manager                                                            
  system-dhcpcd.slice                                                                       loaded active     active       system-dhcpcd.slice                                                        
  system-netctl.slice                                                                       loaded active     active       system-netctl.slice                                                        
  system-netctl\x2difplugd.slice                                                            loaded active     active       system-netctl\x2difplugd.slice                                             
  network.target                                                                            loaded active     active       Network

Last edited by gear4 (2017-09-04 12:49:38)

seth · 2017-09-04 12:53:20

First, kick networkmanager, netctl and the global dhcpcd service - then try again.
Can you ping 8.8.8.8 (googles dns server)?

Fixxer · 2017-09-04 15:39:51

Post any information about your hardware:

lspci -k | grep -A2 Eth

dmesg | grep enp

dmesg | grep -iE 'error|warning|failed'

Last edited by Fixxer (2017-09-04 15:40:27)

Arch Linux

#1 2017-09-04 11:42:36

Unable to connect to Internet via Ethernet

#2 2017-09-04 12:25:21

Re: Unable to connect to Internet via Ethernet

#3 2017-09-04 12:46:48

Re: Unable to connect to Internet via Ethernet

#4 2017-09-04 12:53:20

Re: Unable to connect to Internet via Ethernet

#5 2017-09-04 15:39:51

Re: Unable to connect to Internet via Ethernet

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