Questions tagged [interface]

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Should a VLAN interface filter ingress packets based on the VLAN ID it is assigned to?

PROBLEM: When I receive VLAN TAGGED Multicast Traffic on a VLAN Interface I am seeing messages tagged with VLAN IDs that are not the same as the VLAN ID of the interface. e.g. If I create a VLAN ...
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Secondary (Virtual) Interface on Same NIC with DHCP

I'm currently working on Buster, but the more portable the solution, the better. I have a system for which I would like to add a second IP address to the same adapter. The initial IP address is DHCP, ...
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23 views

Automatic set-up, the network can bus with Ubuntu 20.04

I want to set-up the network of the CAN bus automatically with Ubuntu 20.04. For other distributions, it is done like this in /etc/network/interfaces: allow-hotplug can0 iface can0 can static ...
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1answer
32 views

What are the key components of a desktop environment?

I'm a relatively new Linux user. I started with Ubuntu 20.04 a few months ago, and eased myself into the experience, learning a bit of the command line and becoming familiar with the system structure ...
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1answer
21 views

How to configure 2 network interfaces which make use of the same physical ethernet port?

I currently have a linux system with only one physical ethernet port. This physical port has the eth0 network interface attached to it. I want to create another ethernet interface which also makes use ...
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How to find out interface clocks reliable

Until today I thought, I could read the actual clocks of interfaces on an embedded device (i.MX6, yocto linux with freescale kernel) in /sys/kernel/debug/*/clock But now I see a clock of 50 MHz on /...
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Ubuntu 20.04 problems with interface after installation

I have just installed Ubuntu 20.04 Focal Fossa. After the restart, I found a particular problem with the interface (see figure attached). I'm a beginner in the use of Ubuntu, I have managed to work ...
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1answer
62 views

Create can0 interface for USB CAN Converter Basic (UCCB) on Arch

I have a USB CAN Converter Basic as described here: https://ucandevices.github.io/uccb.html When I plug it into my Arch Linux laptop, dmesg shows the following: usb 1-6: new full-speed USB device ...
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1answer
13 views

My CentOS do not have the brief command vie0

I watch a video, theres has a brief command: I use vie0, but there do not have this command: [root@ansible-master ~]# vie0 -bash: vie0: command not found My CentOS version is: CentOS 7.2
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How to change network mask using ip command

I tried to change the network mask using Linux ip command and got confused. Google search doesn't clarify it either. If someone could explain? Say I have interface enp0s31f6 on my Linux machine rtuser@...
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107 views

Route traffic between interfaces on same device ( wlan0 to usb0 )

I have a usb0 interface with 10.0.0.1 ip with a router on 10.0.0.2 and unaccessible to internet. I also have a wifi adapter on wlan0 with 192.168.0.3 connected to my router at 192.168.0.1 (this is ...
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42 views

How to reduce the time of the “networking.service” service?

I have been using linux for some time and I have already learned to adapt to this new operating system so I want to improve some details of my configuration. Currently the system loads fast, but I see ...
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How can I switch dinamically the output interface in a router depending on input interface?

I have an Ubuntu 18.04 acting as router with 3 interfaces. Two of them end up in the same device (they are used as dual path since depending on the situation one of the paths can be down or viceversa)....
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2answers
186 views

Send packet on one interface and receive it on another one for testing purposes

I would like to test the DHCP client that I wrote on Ubuntu 16.04.6 LTS. I would like to do it locally on my laptop i.e. send and receive DHCP packets inside. Here is what I tried: created two dummy ...
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82 views

Change interface name

I'm with NetworkManager I want to change the interface name, what I don't know sure the steps.... First I should know my interface name and mac from it, ip a Seconds, set down the interface, ...
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1answer
1k views

dummy interface on linux

I need to create a second separate virtual interface on Linux. I choose dummy. And do these steps: $ cat /etc/modules-load.d/dummy.conf # Load dummy.ko at boot dummy $ cat /etc/sysconfig/network-...
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1answer
74 views

Traffic into lo vs eth, why might I be seeing only half the traffic on lo compared to eth?

I am forwarding traffic to ports on eth0 and lo. For the same traffic at the same ports and different ports, when I do a tcpdump and count the packets, for time t, I only see about half the number of ...
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30 views

How to route network traffic through an interface on another host?

I have limited networking knowledge, so please bear with me :) I have a host that runs a VM that has 2 interfaces (ens33 and crc). My host has an interface (eth0) that is on the same subnet as "ens33"...
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1answer
685 views

How to Combine a Bridge with VLAN over a Bonding and Two Default Gateways

I have a Linux server with three NIC that are connected to a switch (one NIC is the management, two NIC form a LACP bonding). In addition I need to use a VLAN (167), because the switch is configured ...
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1answer
230 views

How to set the interface name in `kickstart.cfg` file?

How to set the interface name in kickstart.cfg file? We know if we install CentOS system in a Server, there maybe eth0, ens0, ensxxx, eno1 and so on. I have questions, Why there will generate ...
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1answer
2k views

Bonding of two NIC does not work/go up

I have a Linux server with two NIC that are connected to a switch (and one NIC for management) and I want to use combine them and use LACP there, but for some unknown reason to me the bonding will ...
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1answer
918 views

Where does ethtool get information from?

When I run the command ethtool -S wlp2s0, I get the following information: NIC statistics: rx_packets: 63 rx_bytes: 14163 rx_duplicates: 2 rx_fragments: 58 rx_dropped: 30 ...
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70 views

I do not want a debian interface [duplicate]

Today I set up an old portable pc to be a dedicated machine I have installed debian and at installation process I have chose Cinnamon for graphical interface Now my system is configured and working ...
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1answer
841 views

Kali Linux (Kernel 4.19) MT7610u failed to load

I have installed Kali Linux alongside windows 10 on my system all is good except I get the following errors in dmesg every time I boot. mt76x0 1-1.3:1.0: firmware: failed to load mediatek/mt7610u....
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UDP send buffer error in netstat

I we are running voice application which stream UDP (RTP) packets for voice, I am investigation some strange issue where my ifconfig ens4 | grep error counter going up specifically overrun If you see ...
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6answers
1k views

setting firewall-cmd --permanent is not sticking after reboot

I have two network interfaces: eth0, and p2p1. My default zone is set to public. I would like to permanently set p2p1 to be trusted. In order the achieve this I run: sudo firewall-cmd --permanent --...
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1answer
197 views

Error running vlc on Redhat Enterprise Linux 7

I have installed vlc using following commands- #> yum install vlc #> yum install vlc-core When i try to run vlc, i am getting the following error- [0000000001bce288] core demux error: ...
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1answer
4k views

eth: error fetching interface information: Device not found

I have an ubuntu 18.04 linux server. Why does the command(ifconfig eth) says Device not found whereas this command(ifconfig eth0) works? $ ifconfig eth eth: error fetching interface information: ...
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1answer
2k views

What does “if1@if2” mean in interface name in output of “ip address” command on Ubuntu

What does at sign (@) mean in interface name in output of "ip address" command (or the "ip link" command) on Ubuntu, for example interface name "eth0@if44" in the following output: root@aafa1fc24a0b:/...
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1answer
586 views

Edit interfaces file in C++

Is there any known API to edit /etc/network/interfaces file? I've written a piece of code to make the user able to change IP address of the system from the frontend (web interface). I'm modifying the ...
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1answer
1k views

Linux emulate multiple Wifi connections

I have a Linux machine that creates a Wifi hotspot. I need to simulate a few clients connecting to that hotspot and then using that connectiong to talk to a service, through the wlan interface. The ...
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1answer
651 views

How to use different virtual network interfaces for different processes?

The solution to non-virtual network interfaces is here: https://unix.stackexchange.com/a/210992 But the problem is I have multiple IPs on one network interface and I'd like to be able to assign each ...
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1answer
297 views

How to interface LCD for new WaRP7 (imx7s-solo)?

I'm trying to interface LCD for my new WaRP (imx7s-solo). (we can found both LCD and WaRP7 here LCD and WaRP7 product) The problem is I can not have enough knowledge to verify my work is right or ...
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1answer
148 views

Getting unexpected interfaces in CentOS 7

Suddenly getting some bulk interfaces which should not be in server. Interfaces named like as0t1,as0t2,as0t3 etc. Almost 40 interface like this has been created of which i have no idea. Actually some ...
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884 views

Entries order in /etc/network/interfaces

I have a device with two interfaces, eth0 and eth1. One should get its IP from a DHCP server and the other should get its IP statically. If my /etc/network/interfaces file is configured as follows: ...
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2answers
1k views

Connecting two clients on different physical interfaces using smcroute

I am very new to networking. I have two clients connected on two different physical interfaces which has upnp running on them. I want to add both of them to the same multicast group, so that they both ...
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2answers
163 views

Shared to other computer - Different Interface

I'm using a Debian based Linux system, basically there are these interfaces: wlan0 "wifi connected - 192.168.0.0/24" interface2 "not physical interface - 192.168.20.0/24" eth0 "ethernet cable ...
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992 views

Debian, two IPv6 addresses on single interface

I need to add the second IPv6 to the single interface in Debian Stretch. When using IPv4, this is simple becasue multiple inet static definitions works, i. e.: iface enp5s0f0.10 inet static ...
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1k views

Configuring serial driver sc16is7xx

Initial Question I work with the NXP chip SC16IS740 as a peripheral to an embedded linux system (mainline kernel v4.8). The usecase is quite simple, a continuosly transmitting uart line (9600 8n1) ...
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686 views

Why my Raspberry pi receive no packets using Ethernet?

I use a Raspberry pi 3b. The OS is Raspbian jessie. I don't understand why I can't connect with any RJ45 cable, and only wireless connection works. The cable rj45 is straight. The step I did to ...
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1answer
4k views

isp-dhcp-server, ipv6, WARNING: Host declarations are global. They are not limited to the scope you declared them in

Ciao, this is weird. Everything is working, but I cannot assign static ipv6 addresses. error Jun 12 10:19:15 server dhcpd[2768]: WARNING: Host declarations are global. They are not limited to the ...
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1answer
3k views

DHCPD ip6, No subnet6 declaration for enp2s0 (2001:470:1f1a:5b3::2)

This is weird! I got IP4 DHCP, it works. But with IPV6 not working. Do you know what it could be? INTERFACE allow-hotplug enp2s0 iface enp2s0 inet static metric 10 address 192.168.78.20 ...
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3answers
48k views

Change Mac Address permanently inside /etc/network/interfaces

QUESTION: How might I be able to specifically change the Mac Address of the enp3s0 and wlp2s0 interfaces through the /etc/network/interfaces file? What code would I have to include inside? I have ...
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127 views

How does the following network configuration differ on eth0?

I have a raspberry pi and it has 2 configuration files in /etc/network/, although I set it up I'm very new to networking and not sure what each of the lines do or what the differences are between the ...
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1answer
998 views

Redirecting IPv6 traffic to a VPN interface

I would like to redirect all ipv6 traffic from my local network to a VPN interface. Eth1 is a local interface on the local server, while eth0 is used for internet connection from my home router. So ...
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1answer
2k views

Using ip, what does M-DOWN mean?

When using the terminal tool ip, there is a number of flags for every interface. Example: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue What is the meaning of M-DOWN? ...
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1answer
2k views

network interfaces rename not working as expected. Where to look?

System is Ubuntu 16.10. It has been updated quite some times, so it might have some remaining stuff from earlier versions in there (at least back till 14.04, probably much longer). The issue it the ...
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2answers
1k views

Is value of bInterfaceProtocol fixed or decided by Kernel?

Let's say: $ ls -l /dev/input/by-id lrwxrwxrwx 1 root root 10 Feb 10 03:47 usb-Logitech_USB_Keyboard-event-if01 -> ../event22 lrwxrwxrwx 1 root root 10 Feb 10 03:47 usb-Logitech_USB_Keyboard-event-...
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1answer
180 views

Where can I find the japanese interface package for zabbix server?

Yesterday I installed zabbix server and agent on some of my EC2 Instance (running Ubuntu 16.04) Now I want to add the japanese language interface for my zabbix server (because I'm working for a ...
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1answer
4k views

How to setup a WLAN interfaces with one for Hotspot?

So I'm trying to setup a two interfaces for two wireless cards. One card for connecting to wireless network an one for a hotspot to access this computer through SSH. I need wlan0 for WI-FI connection ...