Can connect via WiFi, but not ethernet. need help please

Odyssey1942 · 11-17-2018, 02:50 PM

Win 10 has been reinstalled on the HDD of my Dell XPS 8700 i7 4790 16 GB RAM, 1T HDD

Ubuntu MATE `18.04.1 has been installed on a Toshiba 120GB SSD for dual boot.

Both installs seem to be OK with the exception of ethernet connectivity on the Ubuntu MATE SSD. WiFi works well.

What steps can I take to identify the problem please?

ferrari · 11-17-2018, 03:48 PM

Start by sharing the relevant hardware details...

Code:

lspci -nnk|grep -iA3 net

or

Code:

sudo lshw -c network

With that we can tell if a driver is loaded or required for example

Odyssey1942 · 11-17-2018, 04:25 PM

Thanks. Here are:

Code:

lspci -nnk|grep -iA3 net
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0c)
	Subsystem: Dell RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1028:05b7]
	Kernel driver in use: r8168
	Kernel modules: r8168
04:00.0 Network controller [0280]: Broadcom Limited BCM43142 802.11b/g/n [14e4:4365] (rev 01)
	Subsystem: Dell Wireless 1704 802.11n + BT 4.0 [1028:0016]
	Kernel driver in use: bcma-pci-bridge
	Kernel modules: bcma

Code:

 lspci -nnk|grep -iA3 net
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0c)
	Subsystem: Dell RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1028:05b7]
	Kernel driver in use: r8168
	Kernel modules: r8168
04:00.0 Network controller [0280]: Broadcom Limited BCM43142 802.11b/g/n [14e4:4365] (rev 01)
	Subsystem: Dell Wireless 1704 802.11n + BT 4.0 [1028:0016]
	Kernel driver in use: bcma-pci-bridge
	Kernel modules: bcma
robert@robert-XPS-8700:~$ clear
robert@robert-XPS-8700:~$ sudo lshw -c network
[sudo] password for
  *-network                 
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: enp3s0
       version: 0c
       serial: 98:90:96:d5:8d:00
       size: 10Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.045.08-NAPI duplex=half latency=0 link=no multicast=yes port=twisted pair speed=10Mbit/s
       resources: irq:31 ioport:d000(size=256) memory:f7200000-f7200fff memory:f2100000-f2103fff
  *-network
       description: Network controller
       product: BCM43142 802.11b/g/n
       vendor: Broadcom Limited
       physical id: 0
       bus info: pci@0000:04:00.0
       version: 01
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: driver=bcma-pci-bridge latency=0
       resources: irq:19 memory:f7100000-f7107fff
  *-network
       description: Wireless interface
       physical id: 2
       bus info: usb@3:11
       logical name: wlx00212f30a0d9
       serial: 00:21:2f:30:a0:d9
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=r8712u ip=192.168.1.236 multicast=yes wireless=IEEE 802.11bgn

ferrari · 11-17-2018, 04:43 PM

Ok, that confirms that the r8168 driver is loaded and that a wired ethernet network device node (enp3s0) is present. With an ethernet cable connected, what is shown by the following?

Code:

sudo ethtool enp3s0

Code:

ip a

ferrari · 11-17-2018, 04:48 PM

I'm not an Ubuntu user, but I note that there appears to have been a move to use Netplan for network management. This guide may be of help with any configuration required...
https://www.serverlab.ca/tutorials/l...bionic-beaver/

Odyssey1942 · 11-17-2018, 05:12 PM

Thanks for hanging with me

Code:

sudo ethtool enp3s0
[sudo] password for 
Settings for enp3s0:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: 10Mb/s
	Duplex: Half
	Port: Twisted Pair
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: on
	MDI-X: Unknown
	Supports Wake-on: pumbg
	Wake-on: g
	Current message level: 0x00000033 (51)
			       drv probe ifdown ifup
	Link detected: no

and

Code:

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
    link/ether 12:34:56:78:99:00 brd ff:ff:ff:ff:ff:ff
3: wlx00212f30a0d9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 12:34:56:78:99:00 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.236/24 brd 192.168.1.255 scope global dynamic noprefixroute wlx00212f30a0d9
       valid_lft 83795sec preferred_lft 83795sec
    inet6 12:34:56:78:99:00 scope global temporary dynamic 
       valid_lft 3600sec preferred_lft 3600sec
    inet6 12:34:56:78:99:00 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 3600sec preferred_lft 3600sec
    inet6 12:34:56:78:99:00 scope link noprefixroute 
       valid_lft forever preferred_lft forever

FWIW, when booted into Windows both ethernet and wifi connectivity works fine. It is only under Ubuntu MATE that there isno connectivity with ethernet. WiFi is good.

Also should I be editing out any of these ip addresses?

ferrari · 11-17-2018, 09:06 PM

The problem is that no ethernet link is detected.

Code:

Link detected: no

Not sure whether this is a driver issue or something else.

Run the following with the ethernet interface connected to your router...

Code:

sudo ethtool -i enp3s0

Perhaps check kernel messages related to the driver as well...

Code:

dmesg|grep r8168

Odyssey1942 · 11-17-2018, 09:19 PM

Code:

sudo ethtool -i enp3s0
[sudo] password for
driver: r8168
version: 8.045.08-NAPI
firmware-version: 
expansion-rom-version: 
bus-info: 0000:03:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no

Code:

dmesg|grep r8168
[    1.038011] r8168: loading out-of-tree module taints kernel.
[    1.038122] r8168: module verification failed: signature and/or required key missing - tainting kernel
[    1.039159] r8168 Gigabit Ethernet driver 8.045.08-NAPI loaded
[    1.053912] r8168: This product is covered by one or more of the following patents: US6,570,884, US6,115,776, and US6,327,625.
[    1.053918] r8168  Copyright (C) 2017  Realtek NIC software team <nicfae@realtek.com> 
[    1.054401] r8168 0000:03:00.0 enp3s0: renamed from eth0

Did this with WiFi enabled. Is that an issue?

Hope this is useful, because I'm in way over my head. Thanks.

ferrari · 11-17-2018, 09:59 PM

That all checks out as expected. Having the wifi enabled shouldn't affect wired ethernet connectivity at all.

The no link detected is concerning though. You could try setting the negotiation manually like this for example

Code:

sudo ethtool -s enp3s0 autoneg off speed 100 duplex full

then check link status again

Code:

sudo ethtool enp3s0

and report back. If it is now showing 'Link detected: yes' you can try restarting the network perhaps

Code:

systemctl status systemd-networkd

and check IP addressing again

Code:

ip a

Normally, I'd have you check another router port and change the ethernet cable, but as you mention this works fine with a Windows environment I'm assuming that these aspects must be ok.

Odyssey1942 · 11-18-2018, 09:54 AM

Ferrari, thanks for this suggestion.

I am a bit timid (not having much experience in CLI), but willing to try. JIC, and before doing so, what are the commands needed to reverse this experiment in case it goes pear shaped?

ferrari · 11-18-2018, 01:05 PM

The ethtool command only makes a non-persistent change (with speed and duplex). Unplugging and replugging the ethernet cable is enough for renegotiation to take place. On top of that your existing ethernet connection is non-functioning (no link detected), so you have nothing to lose.

Odyssey1942 · 11-18-2018, 01:11 PM

Here is what showed: (with no Link detected at bottom)

Code:

sudo ethtool enp3s0
Settings for enp3s0:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: 10Mb/s
	Duplex: Half
	Port: Twisted Pair
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: off
	MDI-X: Unknown
	Supports Wake-on: pumbg
	Wake-on: g
	Current message level: 0x00000033 (51)
			       drv probe ifdown ifup
	Link detected: no

Have you identified the problem, or problem area, that is preventing eth connectivity?

ferrari · 11-18-2018, 04:28 PM

As I mentioned in post #7, I don't know what the underlying cause of your link/negotiation issue is, but until it is sorted forget about using ethernet connectivity...

Code:

Speed: 10Mb/s
Duplex: Half
Link detected: no

Please try changing the cable and/or router port (and compare results). The above output is not normal.

Odyssey1942 · 11-18-2018, 04:42 PM

I had just hoped that all we have done since post #7 might have uncovered possible issues.

I just restarted in Windows on this dual-boot computer and it has good ethernet connectivity with the existing cable in place. Given this, is it likely that changing cable/router port is going to lead to anything? I will do if you think it might be productive.

Looking at the mobo, I conclude that the Realtek controller is integrated. Does it make sense to put in an add-on board (different brand) to see what happens. Probably the only ethernet board/s I might have will be older, but if it works, might it narrow down the issue?

Thanks.

ferrari · 11-18-2018, 05:23 PM

Quote:

I had just hoped that all we have done since post #7 might have uncovered possible issues.

The attempt to explicitly set the speed and duplex (as explained in post #9) clearly made no difference with respect to what you reported in post #12, so it could well be (r8168) driver related. A bug report may be required here.

Quote:

Looking at the mobo, I conclude that the Realtek controller is integrated. Does it make sense to put in an add-on board (different brand) to see what happens. Probably the only ethernet board/s I might have will be older, but if it works, might it narrow down the issue?

If you have other NICs available to try, then worth a shot IMO.