Ethernet Driver Ubuntu

[Rosita Westhouse]

Ihave recently upgraded from Ubuntu 15.10 to 16.04. when i was using 15.10 ethernet works flawlessly. But after upgrading to 16.04 it doesn't work anymore showing network cable unplugged. I tried reinstalling driver & end up getting following error

When i had installed in 15.10 it was installed successfully.My ethernet controller is: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev10).I have done all proxy settings same as they were in 15.10.

After that I still couldn't connect to the internet. But the r8101 kernel module was loaded and in nm the connection came up. I noticed there was no mac address. With the following command I forced a random chosen mac address.

Network configuration on Ubuntu is handled through Netplan, which provides a high-level, distribution-agnostic way to define how the network on your system should be set up via a YAML configuration file.

While Netplan is a configuration abstraction renderer that covers all aspects of network configuration, here we will outline the underlying system elements like IP addresses, ethernet devices, name resolution and so on. We will refer to the related Netplan settings where appropriate, but we do recommend studying the Netplan documentation in general.

Ethernet interfaces are identified by the system using predictable network interface names. These names can appear as eno1 or enp0s25. However, in some cases an interface may still use the kernel eth# style of naming.

Another application that can help identify all network interfaces available to your system is the lshw command. This command provides greater details around the hardware capabilities of specific adapters. In the example below, lshw shows a single Ethernet interface with the logical name of eth4 along with bus information, driver details and all supported capabilities.

Interface logical names can also be configured via a Netplan configuration. If you would like control which interface receives a particular logical name use the match and set-name keys. The match key is used to find an adapter based on some criteria like MAC address, driver, etc. The set-name key can be used to change the device to the desired logical name.

ethtool is a program that displays and changes Ethernet card settings such as auto-negotiation, port speed, duplex mode, and Wake-on-LAN. The following is an example of how to view the supported features and configured settings of an Ethernet interface.

If you require DNS for your temporary network configuration, you can add DNS server IP addresses in the file /etc/resolv.conf. In general, editing /etc/resolv.conf directly is not recommended, but this is a temporary and non-persistent configuration. The example below shows how to enter two DNS servers to /etc/resolv.conf, which should be changed to servers appropriate for your network. A more lengthy description of the proper (persistent) way to do DNS client configuration is in a following section.

To configure your server to use DHCP for dynamic address assignment, create a Netplan configuration in the file /etc/netplan/99_config.yaml. The following example assumes you are configuring your first Ethernet interface identified as enp3s0.

To configure your system to use static address assignment, create a netplan configuration in the file /etc/netplan/99_config.yaml. The example below assumes you are configuring your first Ethernet interface identified as eth0. Change the addresses, routes, and nameservers values to meet the requirements of your network.

Name resolution (as it relates to IP networking) is the process of mapping hostnames to IP addresses, and vice-versa, making it easier to identify resources on a network. The following section will explain how to properly configure your system for name resolution using DNS and static hostname records.

Traditionally, the file /etc/resolv.conf was a static configuration file that rarely needed to be changed, or it automatically changed via DHCP client hooks. systemd-resolved handles nameserver configuration, and it should be interacted with through the systemd-resolve command. Netplan configures systemd-resolved to generate a list of nameservers and domains to put in /etc/resolv.conf, which is a symlink:

To configure the resolver, add the IP addresses of the appropriate nameservers for your network to the netplan configuration file. You can also add optional DNS suffix search-lists to match your network domain names. The resulting file might look like the following:

The search option can also be used with multiple domain names so that DNS queries will be appended in the order in which they are entered. For example, your network may have multiple sub-domains to search; a parent domain of example.com, and two sub-domains, sales.example.com and dev.example.com.

Static hostnames are locally defined hostname-to-IP mappings located in the file /etc/hosts. Entries in the hosts file will have precedence over DNS by default. This means that if your system tries to resolve a hostname and it matches an entry in /etc/hosts, it will not attempt to look up the record in DNS. In some configurations, especially when Internet access is not required, servers that communicate with a limited number of resources can be conveniently set to use static hostnames instead of DNS.

The order in which your system selects a method of resolving hostnames to IP addresses is controlled by the Name Service Switch (NSS) configuration file /etc/nsswitch.conf. As mentioned in the previous section, typically static hostnames defined in the systems /etc/hosts file have precedence over names resolved from DNS. The following is an example of the line responsible for this order of hostname lookups in the file /etc/nsswitch.conf.

[NOTFOUND=return] means that any response of notfound by the preceding mdns4_minimal process should be treated as authoritative and that the system should not try to continue hunting for an answer.

To modify the order of these name resolution methods, you can simply change the hosts: string to the value of your choosing. For example, if you prefer to use legacy unicast DNS versus multicast DNS, you can change the string in /etc/nsswitch.conf as shown below:

Bridging is a more advanced configuration, but is very useful in multiple scenarios. One scenario is setting up a bridge with multiple network interfaces, then using a firewall to filter traffic between two network segments. Another scenario is using bridge on a system with one interface to allow virtual machines direct access to the outside network. The following example covers the latter scenario:

The new bridge interface should now be up and running. The brctl provides useful information about the state of the bridge, controls which interfaces are part of the bridge, etc. See man brctl for more information.

Users of the former ifupdown may be familiar with using hook scripts (e.g., pre-up, post-up) in their interfaces file. Netplan configuration does not currently support hook scripts in its configuration definition.

Instead, to achieve this functionality with the networkd renderer, users can use networkd-dispatcher. The package provides both users and packages with hook points when specific network states are reached, to aid in reacting to network state.

I recently installed ubuntu 18.04 LTS and found that I have no internet connectivity. I should not that I also booted into windows to assure the machine works, and that it was also not receiving internet through the ethernet connection, although I did not press further on this.

This all points me to believe it's an ethernet driver issue. Loading the module for igb and e1000e doesn't seem to make any difference; I see e1000e messages in dmesg, but nothing more about it connecting to a device. No messages for igb. I tried installing the intel 'ice' drivers, but ran into issues because a) I haven't had internet access, so I can't download gcc and tools for the ``make install`` and b) it requires a signed driver, which I believe I could get around in the BIOS settings, but I'm hesitant to here.

I'm wondering if the issue is actually closer to the BIOS level, given ethernet wasn't working in windows either. Could someone help point me in the right direction, please? I would greatly appreciate that!

I've been trying to get my Ubuntu Server VM running through VirtualBox. I ended up trying several network interfaces because of some networking issues and finally got it working. However, I noticed that my machine is now using eth3 instead of the default eth0. There are some scripts on this VM that are linked to eth0 and I'd like to reset the driver to eth0. How would I do this?

I've attempted to run the various networking commands to stop the network and configure eth0 without success. Ubuntu appears to be keeping a tally of all network drivers that I've attempted and increments the interface each time I use a new driver. Because of this, the system takes longer to boot up because it's searching for eth0 primary network interface in /etc/network/interfaces

Ubuntu Server has some custom udev rules in place that allow it to "cache" the ethernet devices that have been plugged in to the machine. The delay you're experiencing is caused, as you suspect, in the /etc/network/interfaces file. While it may be viable to constantly add new devices to the file, in your case, you just want to remove Ubuntu's ethernet cache:

I have an Aorus B550 motherboard running Ubuntu 20.04. The ethernet NIC is not listed when I run the command ifconfig. I have connected via usb tethered hotspot and downloaded the driver off of the Realtek website. The version I have downloaded is R8125-9.004.01 but am not sure what version I have installed previously and am unsure how to find out.

When I try to run the "sudo ./autorun.sh" command as stated in the READ ME file for the driver it gives me the error:

For convenience, I'll repost it here, because I can't seem to attach the link, but I take no credit for the following solution or the github repo. Make sure the adapter is unplugged, and tether to a phone or connect to ethernet. In terminal, do:

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