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I've done a fresh install of Ubuntu 16.04

When i connect another computer or Gigabit switch through the wired connection it fails to assign an ip address to enp5s0.

I understand i could configure a static ip but i would prefer to resolve this issue.

jonny
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  • It's unclear who you connect to whom. – spacelander Oct 13 '16 at 23:39
  • On older distributions when i connect another computer direct to my computer, my computer would assign an ip address to the connection eth0 now changed to enp5s0. – jonny Oct 14 '16 at 10:34
  • you need to enable IP forwarding. Have a look here: http://askubuntu.com/questions/311053/how-to-make-ip-forwarding-permanent#311054 – spacelander Oct 14 '16 at 13:33
  • On a direct computer-to-computer connection, there's no DHCP server, so you must assign static IP addresses. When connected to a switch, is there also a router/modem attached to the same switch. If not, same problem. If so, make sure your Wired Connection profile is set to use DHCP. Cheers, Al – heynnema Oct 14 '16 at 13:39

1 Answers1

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Thanks for all your help, however i've made the following progress.

I ran this command to check the model number of my Ethernet Controller

lspci | grep Realtek

The output 

05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller (rev 05)

I then checked checked what driver the kernel was loading 

lsmod | grep r816*

The output 

r8169                  81920  0
mii                    16384  1 r8169

Seeing that they did not match i headed over to the Realtek website to get the RTL8101 Driver but they only have it for the 3.x, 2.6.x and 2.4.x kernels.

And so either I have to wait until Realtek release a driver for kernel 4.x or upgrade my hardware.

spacelander thanks for the link i learned from it

heynnema i assure you that you can connect direct and get an ip number, as I've been doing it for years and I'm sure with the correct driver I'll do it again.

Thanks & Regards Jonny

jonny
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  • The r8169 kernel module is supposed to support your card. I do not think the problem is with the module. Anyway you do not have to "wait". You can install the Realtek driver from Ubuntu repos. It is r8168-dkms package. – Pilot6 Oct 14 '16 at 18:02
  • Pilot 6, I installed the r8168-dkms but r8169 still remains in lsmod am i doing something wrong? – jonny Oct 14 '16 at 18:21
  • You did something wrong. r8168 blacklists r8169. What does dkms status show and sudo modprobe r8168? – Pilot6 Oct 14 '16 at 18:23
  • dkms status r8168, 8.041.00, 4.4.0-42-generic, x86_64: installed modprobe r8168 no output. Thanks – jonny Oct 14 '16 at 18:28
  • Oops. I did not read the question carefully. You can remove it. It is not for your card. Your card is supported by in-tree r8169. – Pilot6 Oct 14 '16 at 18:32
  • Pilot 6, I have limited experience but i get the feeling this is a kernel issue ever since the time eth0 changed to enp5s0 there has been problems. I don't know if they would even consider this an issue but it affects guys like me thanks for all your help. – jonny Oct 14 '16 at 19:03