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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Delete a bond interface created from /etc/network/interfaces (ifupdown)?

I made an attempt bonding two interfaces into one, created bond0, and found it unsatisfactory. I then reverted all changes made to /etc/network/interfaces and ran systemctl restart networking.service, ...
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Using fallback /etc/network/interfaces in case of parsing error

I have a single /etc/network/interfaces file on my linux board that is by default configured to use dhcp for eth0, however I let my users to configure the file from my app. It's basically a simple ...
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25 views

Can't connect to SSH after changing network card / public IP

I have a remote server that always worked and booted fine. After I asked them to replace my network adapter my public ip changed and I can't access the server anymore. Yes, I am using new IP on putty....
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Wake on lan with only two devices on the network

I am trying to make wake-on-lan work with one device I am connected to directly. I have enabled the feature in the BIOS, and tried multiple times to use wakeonlan with it. Because there are only two ...
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Use and set a default ethernet card for external network/internet (WAN) access

I'm running an Ubuntu PC with 2 network cards: An external USB to ethernet card, eth1 Built in ethernet NIC, eth0 I have eth1 assigned a static IP from the admin and intend to use it as the ...
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How to read what a process is sending to /dev/net/tun?

I altered OpenVPN's client source code to send IP packets through my app, not through the operating system. Therefore I'm creating the IP packets by hand (using libtins). I can see that they arrive ...
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1answer
66 views

What do IP adresses for eth0 and eth1 stand for?

I sshed to my vagrant machine. System load: 0.13 Processes: 169 Usage of /: 6.6% of 61.80GB Users logged in: 0 Memory usage: 76% IP address for ...
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Destination Host Unreachable after switching to static ip

I recently switched to a static IP, and the first time I restarted my computer, I lost my internet connection. Help! More details (For the record, I'm on Debian 10.) I can ping localhost, but not ...
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After fresh install cannot get wifi to work with intel 8265

This all takes place immediately after a fresh arch install where wifi-menu was working while installing on a Lenovo yoga 720 15ibk. After enabling and starting NetworkManager, wifi-menu returns, -...
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bring back eth0, consistent network device naming

I ran into a software licensing problem where in RHEL 7.x which now uses consistent network device naming and or biosdevname and or predictable network interface names. Software did not work having ...
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Network interface isn't showing in iptables

When I'm trying to specifying an network interface with this command: iptables -A OUTPUT -p udp -d 217.00.000.0 -j ACCEPT -o enp0s3 Why can't I see it here with iptables -L command? Chain OUTPUT (...
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“deprecated” in ip addr sh?

When I run ip addr sh I see my secondary IPv6 addresses have deprecated next to them, whilst my primary IPv6 does not. Could someone help explain this ? inet6 2001:DB8::aaaa/64 scope global ...
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1answer
43 views

Restarting network on Debian 5/6

I need to change static defined IP addresses on 2 Debian servers. 1 server is running on Debian 5 and another one is running on Debian 6. I'm connecting to them over SSH so I'm wondering what is the ...
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Keep wifi connection on suspend on Arch Linux

I'm on Arch Linux and I'm trying to make it keep network connections alive through sleep. Is there any way to do that? (otherwise, when I resume, all my Firefox pages go on error and I need to refresh ...
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No Ethernets packets are being sent

I have an embedded device on which I've installed Linux (Linux Kernel and BusyBox). I am trying to configure Ethernets ports, but I cannot send any packets out of the system. When I enable the ...
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Following clone of Fedora Core 30 Server to new hardware, one nic is “missing” but is seen by various utilities; how can I set its configuration?

It was time for new hardware... Never mind the "big picture" but I ended up finding a bug in Fedora Core 31 server that I didn't want to live with, so I loaded on the disk an image snapshot of another ...
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Wi-Fi Disabled [Debian]

Backstory: Lately, I have been installing Debian over Ethernet and then using lwifi once installed. The reason I use this is largelly to conserve my USBs (used for live OSes + my Wifi adapter broke). ...
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setting/using MAC that is multicast and local

is it possible to set a MAC address using ifconfig where it has a 11 in the least significant bits of the first octet? For testing I want to do ifconfig em1 hw ether 13ffffffffff using 12ffffffffff ...
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Network interface statistics: tx_dropped value always 0

I am writing a program that collects and displays network interface metrics located in the /sys/class/net/ folder. When I was reading about the meaning of rx_dropped value, I came to the conclusion ...
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What do network interface names mean in OpenBSD?

Question: What do network interface names mean in OpenBSD? My understanding is that on every OpenBSD system the default interface for build-in ethernet is em0. However, how would I figure out which ...
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How do I use firewall-cmd to block all outbound connections but exclude an IP number and also allow all inbound connections?

I have 1 server using CentOS7: Local subnet: 192.168.10.10/24 => interface eth0 WAN subnet: 123.456.879/22 => interface eth1 I want to use firewall-cmd to block all outbound connections from ...
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problem with internet connection in fresh created VPS's

in my last server, I used virtualizor ~v3.0.1 and there is a little problem. when I create a new VPS the network configuration like IP and Gateway didn't set automatically and I have to set them with ...
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30 views

Routing zeroconf interfaces

Please excuse the long description here, but I think it's worth explaining the setup before asking the question: I have 2 usb Ethernet devices connected to my machine (debian) which configure ...
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tp-link device not listed on nmcli

I've installed a tp-link usb device, in addition to the built-in wifi device, and I can see it on ifconfig after running sudo ifconfig ra0 up: ra0 Link encap:Ethernet HWaddr 50:3e:aa:ac:18:3f ...
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Cannot understand behaviour of ifup/ifdown and /etc/init-d/networking

I want to connect an IP camera to my laptop which runs Ubuntu. The set up looks like this: Once I have the physical connections, I change my /etc/network/interfaces file from: auto lo iface lo inet ...
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36 views

nftables rules not blocking traffic

I am testing NFtables and am attempting to set up a basic routing firewall on a linux machine with 2 interfaces, ens37 and ens38. Here is the ifconfig output for these 2 interfaces. ens37: flags=4163&...
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50 views

qemu-bridge-helper assign the same ip to all VMs

I am trying to have the VMs appear on the external local network with unique ips as if they were a separate regular computer on the local network. I was able to do that with one VM. However, when I ...
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1answer
58 views

Allow C program to set IP as non root

I have a non root user that executes this C program - link to so that shall set the IP address, Netmask and set the interface up, it returns: SIOCSIFFLAGS: Permission denied Is there any way I could ...
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49 views

Can I make a laptop access the Internet via another laptop?

I have a laptop with a nonworking internal wifi adapter, and a sometimes not working external wifi adapter (the problem can be solved by restarting its Lubuntu). I can access another laptop which has ...
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1answer
49 views

wifi interface: unavailable “Realtek RTL8723BE” | Debian 10

I have recently Debian 10 on my ASUS Laptop and no wireless network is connected. Here is the output of the command nmcli : enp2s0f2: connected to Wired connection 1 "Realtek RTL810xE" ...
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1answer
63 views

Network manager goes bad after hot unplugging an external usb wifi adapter

While my Lubuntu 18.04 is connected to a wifi network via an external wifi adapter, I hot unplug the external wifi adapter. Symptoms of the problem: When I plug the external wifi adapter back to my ...
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How can I diagnose hardware NIC problems in Linux?

I have one Dell PowerEdge R640 out of 22 losing packets regularly (once every about 3 minutes). I have checked: the cable (used a different cable still the same behavior) the switches and all the ...
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594 views

airmon-ng did not find any wireless interfaces

I try to start wifite on VMware (Kali) but doesnt work, is there a possibility to use the local network card (Intel(R) Dual Band Wireless-AC 3168) to let search the VM for availible networks? this is ...
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15 views

Automatic routing when connecting a usb network adapter

The gateway is not set automatically when connecting a USB network adapter in R-PI. I want to set it automatically, what should I do?
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not get option for “address of network interface you want open vpn listening to” while configuring open vpn

by using this command $ sudo ./openvpn-install.sh first option to configure ip address of network interface for open vpn is not offered to me. i directly start below this option. why this option is ...
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ip address validation for setting up open vps

I am following tutorial to setup open vpn. to Find and note down your IP address he used this command ip a show eth0 and get result inet 172.26.6.74/20 brd 172.26.15.255 scope global eth0 However i ...
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19 views

How to send ethernet frames from one veth to another?

I have two veth pairs (veth1, veth1_0) and (veth2, veth2_0). veth1_0 and veth2_0 are in the default namespace ns0, veth1 is in namespace ns1 and veth2 in namespace ns2. I want to communicate between ...
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95 views

Why does adding an interface to a bridge disconnect the interface (for good)?

I was playing around with vagrant-libvirt and wanted to bridge my virtual machines to my LAN so that they get a DHCP lease and are reachable from the network. Since vagrant-libvirt does apparently not ...
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How to troubleshoot a virtual interface which is currently down?

One of the virtual interfaces on my linux instances is showing linkdown when I run the command: shell> ip route show 172.20.0.0/16 dev br-960qm6tr45nb proto kernel scope link src 172.20.0.1 ...
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1answer
193 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
131 views

What's the difference between a virtual network interface (e.g. eth0:1) and an alias or second IP added to eth0?

I apologize if the terminology I used in the title is incorrect, but I'm having a difficult time finding official terms/definitions. I'm on a CentOS 7 system and if I want to add a second IP address ...
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203 views

What is the systemd-native way to manage NIC ring buffer sizes before bonded interfaces are set up?

Managing NIC ring buffer sizes with ethtool is simple, for example: ethtool -G eth0 rx 4096 tx 4096 (Or replace eth0 with whatever interface you need to manage.) Doing this live is easy. Trouble ...
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How to use cdc_ncm driver instead of cdc_acm in ModemManager

In Ubuntu 16.04 I try to use a USB modem in NCM mode. But ModemManager uses automatically the cdc_acm driver which creates a PPP interface. lsusb shows 6 cdc_acm devices and 1 cdc_ncm device. How can ...
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systemd .link files not working

I'm running Armbian Buster on an Odroid HC2. Actually, my interfaces names looks like that : enx001e0632c19d for eth0, and wlx503eaa4a712a for wlan0. I would like to not use the predictive interfaces ...
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1answer
96 views

/etc/network/interfaces - multiple gateways 3 NICs

Good Evening, Is this a correct network configuration? All of the routing takes place on my switches and firewall. Each server is able to ping the other on each subnet. Is there an issue with using ...
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37 views

Find if “consistent network device naming” is available

I have a piece of custom software that needs to know the name of a certain network interface on multiple systems (two of them to be more exactly) on which I cannot change anything like disabling the "...
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20 views

NetworkManager's strategy in picking a Wifi network

When several configured WiFi networks are available, it seems that NetworkManager does not always pick the one with the strongest signal. How does NetworkManager choose the preferred WiFi and is it ...
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15 views

How to only start network interface when usb-stick is connected?

I have a tinkerboard setup, that it start its network configuration on startup, and opens a bridge. Now I need a setup, where the wlan only boots, when i connect an external device. Preferably if a ...
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Accessing SSH of a device connected on a separate interface (Ubuntu)

I've got the following network setup: Windows PC <-ethernet-> Odroid XU4 <- USB Ethernet-> nVidia Jetson I would like to be able to have network access from the Windows PC to Odroid (SSH) and ...
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UDP not working for secondary IP in ubuntu

I have dco-access named interface configured on VM based on ubuntu wherein I configured 8 IP from same pool, but only global dco-access accepts udp and no other IP from global secondary accepts udp, ...