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ifdown: interface end0 not configured. RTNETLINK answers: File exists. ifup: interface end0 already configured when setting static and DHCP interface

In a device with Debian BookWorm 12.5, I want to enable and disable a static IP using a Node application at runtime. The /etc/network/interfaces is the following : auto lo iface lo inet loopback ...
M.Liscio's user avatar
  • 230
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0 answers
45 views

What could cause Wired ethernet adapter to remain stuck on "connecting" until I reload nmcli

When I boot up my debian machine, my ethernet adapter remains in "connecting..." state, not actually "connected", it used to always be connected by the time the machine was booted ...
raquel's user avatar
  • 11
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0 answers
92 views

For a VLAN aware bridge, do you assign the native VLAN to the bridge itself or a vlan interface?

Given a vlan-aware bridge in which I have a multitude of (tagged) vlans. VLAN1 is the management VLAN and untagged. The machine hosts lots of VMs/containers which are part of one more VLANs; the host ...
divB's user avatar
  • 208
2 votes
1 answer
165 views

default gateway not set when using bond0 interface

This is my /etc/network/interfaces file: auto bond0 iface bond0 inet manual address 10.66.7.11/24 gateway 10.66.7.1 bond-mode 802.3ad bond-slaves eth2 eth3 bond-miimon 100 bond-...
Martin Vegter's user avatar
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1 answer
210 views

dhclient process messes up the wrong interface

I'm using Debian Buster and I have two interfaces configured: eth0 and wwan0 (broadband modem). Here's the relevant part of my interfaces file: # The primary network interface auto eth0 iface eth0 ...
Alexandr Zarubkin's user avatar
0 votes
0 answers
275 views

Bridge won't get DHCP address if network available AFTER boot

I have 2 ethernet ports bridged as follows (/etc/network/interfaces.d/br0): auto br0 iface br0 inet dhcp bridge_ports enp1s0 enp2s0 bridge_fd 0 bridge_waitport 0 ...
Lewis Smith's user avatar
1 vote
0 answers
23 views

Building a lab, interfaces file issue, networking service won't restart because of ifup

Hello (beginner to linux networking), I'm trying to build a lab in VirtualBox with a Debian GLPI server for school, the VM has 2 network interfaces : a NAT one in dhcp (eth0) and the other one (intern)...
arty0m's user avatar
  • 11
19 votes
1 answer
8k views

DNS broken when using ifupdown and systemd-resolved after upgrade to Ubuntu 22.04

TL;DR sudo cp -p /etc/network/if-up.d/resolved /etc/network/if-up.d/.resolved.broken-orig #Edit /etc/network/if-up.d/resolved and take out the extraneous quotes on lines 48 and 52 #The fix looks like:...
Spokane_is_actually_kinda_okay's user avatar
0 votes
1 answer
736 views

ifupdown change parameters dhclient

I have Ubuntu 20.04 where I gave all network functions to ifupdown. 1 of my interface got network parameters by dhclient: #/etc/network/interfaces allow-hotplug enp2s0 auto enp2s0 iface enp2s0 inet ...
KonstantinKuklin's user avatar
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Bringing up ethernet device under Debian riscv64

I have a Sipeed RV 86 device, which is a RISCV 64bit. On this,I run a minimal Debian OS, that let's me log in via the USB interface, as the device shows up as ttyUSB0 on the host Linux PC. When I then ...
Bram's user avatar
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5 votes
1 answer
930 views

How can i find out which network interface managing solution is used on a given linux distribution in an easy and robust way?

I frequently find myself sitting in front of various different Linux installations and need to check or change network settings. They are different versions from different distributions (mostly debian ...
Sorontik's user avatar
0 votes
1 answer
795 views

Adding a VLAN-transparent bridge to Linux (Debian)

On my current Debian system I use VLAN tagging and I create bridges br-wan and br-lan that I use for LXC containers: auto lo br-lan br-wan iface lo inet loopback iface br-wan inet manual     ...
divB's user avatar
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0 votes
1 answer
5k views

ifdown: interface enp0s3 not configured. RTNETLINK answers: File exists. ifup: failed to bring up enp0s3

I have a virtual box (6.1) with ubuntu minimal. in the settings of the virtual machine in the network section, "Bridged Adapter" is selected. root@ubuntu:/home/mista# dmesg -T|head -1 [Sun ...
Mexanizm456's user avatar
1 vote
1 answer
1k views

How can I figure out why my network configuration is simply ignored?

I have been running Debian 10 a.k.a. Buster without issues. My problems started when all of a sudden, network connectivity dropped. At that point, NetworkManager was active. I stopped and disabled the ...
berndbausch's user avatar
  • 3,577
12 votes
4 answers
63k views

Why are post-up commands in /etc/network/interfaces ran multiple times at boot?

Here is the content of /etc/network/interfaces: auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp post-up /etc/network/if-up.d/sshstart And sshstart is a script with the following in ...
TCZ8's user avatar
  • 1,079