Questions tagged [network-interface]

hardware (or its representation by software) that connects a computing device (host) to a computer network (net)

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Are virtual network interfaces useful outside of container usage?

My networking background is limited. I've been trying to understand more about VETHs, TUN/TAP, etc virtual network interfaces. So far it seems that they make sense from a container perspective, but ...
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CentOS 8: Network Card disconnected on boot

Having an odd issue, just installed RockStore on a computer (CentOS based) and it is all running fine, but when the system boots the NIC is disabled. I run nmcli device status and I can see the device ...
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Network namespace as a regular user

In linux you can create network namespaces, using the ip command. But you need to be root to run that command. However you can still create network namespaces as a regular user using unshare -rUn. ...
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How U-APSD works when only delivery enabled?`

Could you please anyone explain how U-APSD power save works for particular access category is only delivery enabled?
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vboxnet0 interface prevents applications to use Wi-Fi

Since some days ago , a strange interface showed up in my system and is there even when I close Virtualbox : $ ifconfig ... vboxnet0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether ...
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Reasons for huge paket loss

I run Linux Mint 19.2 (so Ubuntu basically) on a Intel Core i7 2.7 GHz (×2) machine with 8 GiB memory. The laptop is a almost 10 years old but still working fine except for wireless connection. The ...
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I cannot find WLAN0 in my BeagleBone Black [closed]

I cannot find WLAN0 in my BeagleBone Black. I want to connect Wi-Fi adapter to my BeagleBone and I cannot enable it even though going through all the internet steps.  What do I need to do? The list ...
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Can't bring the wifi interface up on Debian based os

I was making a mess while trying to setup two working static ip addresses when i managed to turn down the wifi interface, and now I can't turn it up again, I've alredy tried: ifup wlp19s0 output: ...
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Is Wi-Fi power saving smart enough to only actually take effect when on battery (no power plug)?

Referring to NetworkManager commit 6bb0cffba32ec925743c4d491b75474d4e855198 implementing dynamic power save (DPS) as advertised in "Manage Wi-Fi latency and dynamic power-savings on Linux", ...
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Ubuntu 18 netplan Argument list too long

I try to add 8k IPs to my network interface with netplan, after adding all IPs to yaml netplan config and apply changes, i get the following error: /run/systemd/network/10-netplan-enp5s0f0.network:...
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WiFi not working Kubuntu 20.04 - Intel 8265 Network Interface

I have a problem with my WiFi card on Kubuntu. Sometimes the system doesn't recognise it, but what is strange is that it doesn't happen everytime, but just about one boot on four, and I can't ...
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Customized wifi connecting app - tkinter python2.7

I am making a tkinter application(python2.7) for Ubuntu. To connect to wifi, i have two options given below. nmcli dev wifi connect password nmcli c up My problem is sometimes when i fire the ...
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Bash: Determining if CANbus Bitrate is Configured Properly

I'm working on an embedded Linux (4.1.15) bash script wherein the bitrate of a CANbus may be one of several possibilities. When my module comes online it comes up at the first bitrate in the list, ...
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List of all network card chipsets supported by Linux image

I've an ISO Linux image with customized distribution which bases on CentOS. I installed this distro on VirtualBox and I can communicate with it only through CLI (no X). I need to know which PCs with ...
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Can't ping virtual tap network interface via IPv6 from primary interface (eth0)

I'm having trouble communicating with my virtual tap devices via ipv6. Essentially ping6 -I eth0 <tap interface link-local ipv6 address> doesn't return anything. I can't even ping the host-...
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Grub2 to use “eth0” for os-prober entries

Following up on How can I change the default "ens33" network device to old "eth0" on Fedora 19?, Modern Linux uses Consistent Network Device Naming which makes default network ...
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Unable to see ethernet NIC interface in Ubuntu 20.04 even though NIC is present and has physically linked up

I am unable to see my ethernet card ports in the OS (Ubuntu 20.04) by doing ip a. I can see the card in lspci and also under lshw. I know (from BIOS menu) that a port in the Card is also connected. ...
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5.4.42 kernel DSA networking kernel crash

On OpenWRT 5.4.42 kernel on an imx6, I'm seeing a kernel crash when loading builtin modules of igb driver and mv88e6xxx driver over PCI bus. I've searched for the messages in the kernel code and ...
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Why does adding an IPv4 address alias to loopback adapters make the entire subnet range pingable but not for IPv6?

For example with IPv4 addresses I can add the alias 172.16.0.0/12 to a loopback adapter: ip addr add 172.16.0.0/12 dev lo and I am then able to ping any address from 172.16.0.1 - 172.31.255.255 ...
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Routing traffic between two NIC's on two VM's

I know that this question might have already been asked, but I'm struggling with doing it the way that I want it to be. Ok, so here's the situation: 2 VM's VM A - CentOS (with two network adapters): ...
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How to manage the message rate for the SocketCAN API?

I would like to ensure that my CAN messages are being sent at a rate between 50 and 100Hz. I am also not sure how I would calculate that... I was looking at what the Broadcast Manager does in the ...
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1answer
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Low Speed on wired NIC

O.S : Fedora 32 Kernel Version : 5.6.14-300.fc32.x86_64 I've had an Onboard NIC I can't get my total ISP speed Provider that is 600MB, some month ago this work for me: I've made a speed test: https:...
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How to relay traffic from tun to internet?

I'm writing a program that sends data through a tun interface. I'm trying to send IP packets to the world. I have all the TCP/IP stack working: It creates a valid TCP/IP packet ready to be sent, I ...
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Virtual NIC interfaces go down when physical NIC doesn't have IP address

I am creating two virtual interfaces from a physical NIC interface using SR-IOV: echo 2 > /sys/class/net/PHYSICAL_INTERFACE/device/sriov_numvfs I want to use one of the virtual interfaces with a ...
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1answer
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Why does iperf results not change with traffic control change to outbound?

I have been trying to change bandwidth between two ec2 instances using tc and outbound rules using HTB and TBF. I set these rules on on ec2 instance which acts as server and then test from another ...
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Check which network interface an SSH tunnel is using

I've got a server with 2 network interfaces. Due to a restrictive NAT firewall, it establishes an SSH tunnel to a server on the internet: ssh -fNTMS "/tmp/tunnel.socket" host; ssh -S "/tmp/tunnel....
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Debian 10 Server: Configuring multiple interfaces including computer-to-computer network. Interface does not raise on boot

Breif I'm trying to configure a computer-to-computer (via a switch although this isn't directly relevant) network to be used as a high-speed link between my workstation and a server. Both are Debian ...
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1answer
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IPv6 direct connection

A project (Linux based) I am working on requires an IPv6 only network interface which can be accessable via mDNS when connected to a network or when directly connected to another machine. The ...
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network firmware version - what is means? and what the aspect of wrong firmware version

we have two physical machines that should be with the same HW with Rhel 7.5 version, we checked the network card details by ethtool -i on the first we can see driver: i40e version: 2.1.14-k ...
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How to find network card details on RHEL machines

Is it possible to find out the details about Linux cards? For example we tried: dmidecode | grep -i network Function key-initiated network boot is supported Port Type: ...
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1answer
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How to add an IPv6 address?

The official Debian networking documentation tells to use: ifup 6to4 But ifup is not found (ifupdown and ifupdown2 are commands not found too, even after having been installed). Does it have ...
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Change priority(bandwidth) of network interface or by ip address

I have a virtual router with two networks. WAN and LAN. On LAN there are several PC's with fixed IP all on the same network. The router OS is Linux based. Traffic from PC A would by default use all ...
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1answer
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How can I have more than 10 entries in the iftop text output?

I want to monitor the network traffic and save the results to a file under Debian Linux. I am using iftop to achieve this. Following command does the job: iftop -tnNBP -s 3600 -o destination > ...
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How to connect a qemu / kvm mac os x guest os to internet inside WSL2

I've installed ubuntu 20.04 on WSL2 and I started a VM with qemu and kvm,running mac os x as guest os. It works great,except for the configuration of the net. Infact it is not able to connect to ...
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VM network interface issues on CentOS 8

I am using a machine with CentOS 8 to create VM. Everything is working fine and now with the initial DHCP setup for VM instances. I want to change one of my vm instances network settings from DHCP to ...
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How many times is the data packet copied before finally reaching the NIC?

On a typical linux machine, how many times would packets be copied from the application layer to all the way in its journey to the network card. I am assuming the protocol being used here is TCP/IP ...
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How to install drivers for Broadcom BCM43142 on Kali Linux

I'm trying to install drivers for Broadcom BCM43142 on Kali Linux, but all the tutorials I searched for were using apt-get, etc., but I dont have ethernet support, I am on my windows pc right now ...
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1answer
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NetworkManager is failing to switch AP: Connection Activation Failed

I would like to switch which AP an iot device is connected to based on some external logic. My AP switching script looked like this: function switch_ap() { current_connection=$(nmcli conn show --...
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1answer
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What is the proper way of giving a program network interface privileges without hard-coding the sudo password? [duplicate]

I'm developing a small tool to record some sensors in GNU/Linux. Some of the sensors transmit their data over UDP, so I'm using libtins to capture it. I would like to control the sensors start/stop ...
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Can't bring up network interface - RTNETLINK answers: Operation already in progress

I have Kali Linux 2020.2 on my laptop. When I started it today I couldn't connect to any wifi networks. I checked the network manager: systemctl status network-manager.service ● NetworkManager....
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my laptop USB-C hub causes my linux workstation to lose network

about 2 weeks ago, I noticed that my workstation on ubuntu was randomly losing network after working fine on different locations for over a year. Recently, the workstation was moved from an office to ...
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Debian buster odd IFace issue [closed]

i've been taking some tome to learn more about Linux, and i've chosen Debian buster as mais main 'lab'. One think to highlit is: its a debian vm on Oracle virtual box. The problem is: i want to work ...
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iwlist --> Interface doesn't support scanning

First of all, excuse me if my english is bad, I'm french. I switched my computer on Debian 10 Buster but I can't use Wifi. In fact, I can't scan for wifi because my interfaces don't support scanning. ...
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OpenVPN Change ROUTE_GATEWAY after the IP of the gateway interface changed

The server had 192.168.56.9 in before and changed to 192.168.56.10, but the ROUTE_GATEWAY is still on the old IP: $ openvpn --show-gateway Sat Apr 18 13:18:54 2020 ROUTE_GATEWAY 192.168.56.9/255.255....
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Trying to configure Network Card to have IP address

I am a new Linux Mint user and my laptop so far only works with wifi and does not work with wired ethernet. When I type ifconfig -a I get the following: enp0s25: flags=4099<UP,BROADCAST,MULTICAST&...
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Linux Interface Mode MACVLAN with Private mode doesn't seem to work as advertised (Ubuntu)

I am trying to create virtual interfaces (type MACVLAN) such that all communication between the interfaces is sent out of the host towards the eternal default gateway. There is plenty of writeups ...
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Wifi dropouts - could mbsync be the cause?

An odd wifi problem here on Ubuntu 19.10 on a Dell XPS 15, with an Intel AC 9260 card. Normally it's rock-solid, and stays connected for days at a time. This includes multi-GB transfers up and down ...
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Wifi connection hanging when 'getting IP configuration'

I've got the same issue as described here. My Linux Mint can't connect to WiFi, it keeps saying connecting but never actually connects It was never answered. The output of mncli is GENERAL....
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ifupdown /etc/network/interface “iface * net dhcp” wildcard/star/*/regex?

Whats the convention for preparing an ifupdown configuration that will automatically raise and perform inet dhcp on all "ens* enp* eth*" interfaces?
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What does netif_start_queue() do and are net_device_ops callback only called after netif_start_queue()?

I want to know after which function call or which event the callbacks in net_device_ops can be called? Is it possible that the callbacks like ndo_open, ndo_start_xmit etc. can be called after the net ...

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