Questions tagged [interface]

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VirtualBox: How to use a specific interface for NAT?

I have eth0 and wlan0. eth0 is the default interface. What I want is to make VirtualBox use wlan0 as NAT. Is this possible? Host and guest are both Debian. Edit: VBoxManage modifyvm "Debian" --...
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1answer
65 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
38 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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17 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
102 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
28 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
454 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
196 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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48 views

From VLAN10 (eth0.10) Internet access to the whole network and clients? How to route?

Can I make the Internet Access of VLAN10 (eth0.10) to whole Router an Clients? iptables -A FORWARD -i br0 -s 192.168.1.0/255.255.255.0 -j ACCEPT iptables -A FORWARD -i eth0 -d 192.168.1.0/255.255.255....
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VM CentOS7.2 can not change the interface name

I have a CentOS 7.2 virtual machine. when I execute the below commands to change the default interface name, seems have no effect: 1) I change the /etc/sysconfig/network-script/ifcfg-ens33 filename ...
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1answer
63 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
581 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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515 views

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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20 views

Dell poweredge running ubuntu server, redundant interfaces

I have an ubuntu server 18.04 with redundant internet interfaces. As of now my ifconfig looks like this: eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.150 ...
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5answers
471 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
150 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
1k 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
1k 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
368 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
814 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
479 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
255 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
110 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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776 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
93 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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0answers
696 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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844 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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513 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
3k 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
33k 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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111 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
769 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
1k 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
996 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
597 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
115 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 ...
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1answer
776 views

how to create virtual router/switch on Ubuntu server

I have a dedicated server ubuntu 16.04 OS / 8 GB Ram, with over 5000 IPv6 from /48 subnet assigned to using below command ip -6 addr add IPv6/48 dev eth0 creating massive parllel connections cycling ...
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0answers
443 views

Tap interface is not receiving packets

I'm configuring a tap interface and trying to send and receive packets through it, i configure it like this: ip tuntap add name tap0 mode tap multi_queue ip link set tap0 up i'm using scapy to send ...
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1answer
109 views

Find what physical interface is external facing

I would like to know how I can bash script a check to see which interface has an external connection (eth0, eth1, wlan0, em1 and em2) so i can get a script to work on any machine without having to ...
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184 views

Route specific layer 2 traffic output to another interface

Supposing I have 1 interface (wlan0) and 1 virtual interface (wlan0:0). What I want is to route specific layer 2 traffic (arp request only for example) from wlan0 to wlan0:0 My problem is very ...
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0answers
719 views

Internet connection over GSM module + PPP

I am trying to get internet connection in my raspberry pi 3 (Raspbian) with a GSM (SIM900a) module, connecting it to RXD/TXD Serial ports (/dev/ttyS0), I already got an ip address and DNSs, but I can'...
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2answers
2k views

What network interface is a process using?

Is there a way to find what process is using a given network interface? The title of a related question on here is a bit too specific for my needs. I need to confirm whether my process is running on ...
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2answers
713 views

Assigning persistent interface names, using udev, with a generalized method

I'm currently working on a Raspberry Pi 3, trying to do some IoT stuff. I want it to be able to sniff on a usb wireless adapter, and send its data either via default wireless adapter or ethernet. I ...
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2answers
128 views

Ubuntu 15.10 Networking Problems

I recently deployed a VM with Ubuntu 15.10 and I am having trouble configuring the network properly. Note: When the OS was installed, it picked up an IP (from DHCP I guess), because it didn't ask me ...
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1answer
187 views

How to run bash script when eth0 came up from hibernate

I have following problem and I can not solve it: My Debian server should execute a Bash script as soon as eth0 came up from hibernate. I have created a script in /etc/network/if-up.d/: #!/bin/sh # ...
3
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1answer
318 views

Can AppArmor restrict access to a specific interface?

A deceptively simple question; Can Apparmor on Ubuntu (any release) restrict network access for a specific application to a specific network interface? If it can; an example/tutorial/etc link would ...
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0answers
114 views

Configuring a Linux Forwarding Engine

I am trying to configure my Debian machine to simply forward all ingoing network packets on interface eth0 to eth1. My hardware setup is the following: Sender Machine A (eth0) ----> (eth0) Forward ...