Questions tagged [bridge]

Bridging is a forwarding technique used in packet-switched computer networks. Unlike routing, bridging makes no assumptions about where in a network a particular address is located.

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5 answers
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Creating a bridged WiFi AP (hotspot) in Centos 8 (or Fedora)

I am trying to create a bridged WiFi hotspot on a Centos 8 system, using NetworkManager. The machine is Dell EPC3000, with two built-it GigE's and ath10k wireless adapter, plus an LTE WWAN. Creating ...
0 votes
0 answers
26 views

Centos Network Manager -nmcli How to revert to previous status of network or remove properties of network?

I'm a newbie in network, so please understand me. I have a bond network, but I added a bridge network to the bond as master using nmcli con modify bond0 master br0 but after that, I lost IP address ...
1 vote
2 answers
1k views

How to use nft on linux bridge to block access to certain ip addr?

I have an Ubuntu box with a bridge br0 defined. The bridge has eth0 connected to the internet service and eth1 connected to the network port of a PC. The bridge is functioning as expected and passing ...
1 vote
0 answers
146 views

UFW is not filtering traffic routed through bridge

I am experiencing a case where UFW is not blocking packets coming from a VPN host, going through the VPN interface, then through a bridge and finally to a VM. I could configure another firewall on the ...
3 votes
2 answers
5k views

NetworkManager bridge is not working

I face the same problem on 2 difference machines: A CentOS 8.1 and an openSUSE Leap 15.2 I want to create a bridge on each host that will be used from libvirtfor bridged networking. On both servers, I ...
3 votes
2 answers
331 views

Debian create persistent network bridge

I need to create a persistent network bridge for Virtual machines (libvirt) So this bridge does not need any physical ports, connections will be routed for this bridge. If I set this up manually, it ...
1 vote
1 answer
33 views

Isolated bridge in Debian

According to Is it possible to enable port isolation on Linux bridges?, it is possible to create isolated ports in isolated on with the bridge command. This uses the BR_ISOLATED flag for the interface....
2 votes
2 answers
167 views

bridge for virtualisation stays in state DOWN - unable to get it up

Running Rocky 9.3, attempting to get a bridge for a public Range of IPs for use with Virtual machines. Same hardware used to run Centos 7.8 machine with it all working, am now trying to set it up the ...
5 votes
1 answer
5k views

pfsense bridge of vlan interfaces

Hardware Setup AMD E1-2100 Mini-ITX Motherboard with Onboard Gigabit (re0) Intel PCI Express (x4) 4-port Gigabit Adapter (igb[0123]) Software Setup pfSense v2.3 I'm trying to replicate my OpenWRT ...
1 vote
2 answers
10k views

pfSense bridging Wi-Fi and LAN: allow access between Wi-Fi and LAN

EDIT: Why would I want to do such a thing? This is a test, and there is 1 machine behind pfSense that I wish to manage, and Wi-Fi makes that easy. Carrying on: The auto-suggessted topics by Server ...
0 votes
0 answers
139 views

Creating onlink route via bridged adapter unexpected behavior

I am trying to create an onlink connection between a Windows host and a Linux vm guest in VirtualBox using a bridged network adapter. The IP on the guest 10.x.x.x. The IP on the host is 192.x.x.x. I ...
0 votes
0 answers
70 views

How to set Netplan networking configurationfor CloudStack bridges on Ubuntu 20?

I am trying to setup a host for our CloudStack test, but I cannot figure out the issue when configuring the bridged on the network with Netplan. From the installation documentation, they show an ...
0 votes
1 answer
132 views

vlan on top of vlan-aware bridge: possible and how?

I'm currently working on configuring an opensuse host as a KVM hypervisor. I have a physical interface as slave for a bridge. I'm going to make this bridge interface vlan-aware and handle the VLAN-...
0 votes
1 answer
76 views

Ping from a network namespace to another EC2 instance not working without NAT rule

I have the below setup. I have setup two EC2 instances. I have added the security group rules on both machine to allow ICMP traffic and both can ping each other. On one machine I have created two ...
1 vote
2 answers
5k views

Docker Host with multiple VLANs

Background Information I have a server with one physical network interface that is running Docker. This interface is configured as a 802.1Q trunk. To avoid asymetric routing I configured routing ...
7 votes
2 answers
31k views

Cannot ioctl TUNSETIFF tap0: Device or resource busy (errno=16)

I'm having this weird issue that when I run bridge-start together with openvpn, the service won't start. If I don't let openvpn run bridge-start, and add the necessary interfaces (tap0, br0) manually (...
1 vote
1 answer
568 views

untagged traffic must become tagged traffic after passing through the bridge

I'm trying to achieve something simple. I have a machine which has a single physical port enp89s0. this is connected to the native VLAN (VLAN=1). I need to create VMs and place them on a separate VLAN=...
0 votes
2 answers
1k views

Libvirt routing between two NAT networks

I have following two networks, <network> <name>subsys-network</name> <bridge name="virbr1"/> <forward mode="nat"/> <ip address="192....
1 vote
1 answer
5k views

Host to guest connection via SSH (using qemu vm)

I am having trouble to enable a host-to-guest communication using qemu VMs. The goal is to connect via SSH from the host to the guest VM. I have the following setting: host: local access to SSH ...
2 votes
2 answers
5k views

Network stop working after adding bridge interface

I'm using Fedora 25, with kernel 4.11.9, kvm and bridge-utils are installed. I'm following the instructions on http://www.linux-kvm.org/page/Networking#Public_Bridge, to get public bridge. I also have ...
0 votes
2 answers
139 views

Aruba 1930 to build Lab Network separated from office network

Here is the network i need to build for our company lab: Note: All is centered on the Aruba 1930. Network A - 192.168.178.xxx/24 Port 25 on Aruba, SFP+ 10 Gbps -> Cisco SFP+ Gbps -> Router -> ...
0 votes
0 answers
32 views

When I create a bridge and make my ethernet port the bridge's master, what device does the kernel use for sending and receiveing

If I create a bridge and set its master to my ethernet port, how does the kernel send and receive packets? # Create the bridge ip link add name br0 type bridge ip link set dev br0 up # Make eno1 the ...
1 vote
1 answer
368 views

Occasional packet loss between bridge interfaces

I have two virtualization servers based on libvirt and KVM. And sometimes I see packages get lost on one particular virtual machine. After restarting the virtualization host this problem is solved, ...
0 votes
0 answers
139 views

Requests between docker containers on same host using the public IP

I have a server with Docker and some containers executing. The host has a public ip and a service listening on port 80 from one of the containers. If I try to wget the service using the public ip from ...
0 votes
1 answer
616 views

Migrate from /etc/network/interfaces to netplan

I am trying to migrate from /etc/network/interfaces to netplan and network-manager setup. I am "almost" there. My current setup with /etc/network/interfaces is as follows: auto lo iface lo ...
0 votes
0 answers
1k views

Connecting two VMs running in KVM

Short: Get two VM's to talk to each other running on same hypervisor. I have two VMs running under KVM and I am trying to manage them via Cockpit. The hypervisor, and the vm's are running Ubuntu 20.04....
4 votes
2 answers
10k views

Set up bridged vxlan network in linux

I'm trying out vxlan with linux, and this problem has kept me stuck for days. Simple Vxlan works fine Simple vxlan with muticast works for cross-host communication, this simply create a vxlan vtep ...
0 votes
0 answers
75 views

pfSense L2 firewall not blocking half of DHCP traffic

I have a pfSense instance (NetGate SG-series), with setup: 802.11q enabled LAN ports 1 (LANP) and 2 (LANB) with VLAN assignments Interfaces assigned and enabled LANP: (1, 5t) tag configuration ...
1 vote
2 answers
1k views

Proxmox VE Dedicated Server OVH - Config Issues In Network Setup With 1 Public IP

Problem: (No Internet & No DHCP) I cannot seem to get my VM's to connect to the internet nor am I able to setup a DHCP server to automatically assign IPs to them. Introduction/PSA for dupes: I've ...
1 vote
0 answers
267 views

Linux bridge not forwarding traffic after changing bridge ports

Problem: after changing bridge-ports value of a network interface, all networking on that IP stops working. Base system is Proxmox VE 7.4, based on Debian Bullseye. Background: I have a Proxmox VE ...
1 vote
1 answer
528 views

Unable to create a Linux bridge with a VLAN interface on Fedora

I'm trying to set up a Linux bridge that includes a VLAN interface on my Fedora system. My goal is to use this bridge with virt-manager to create multiple VMs, each with an interface in the bridge ...
1 vote
1 answer
302 views

Libvirt - UDP not working between host and VM

Host: 192.168.1.144/24 VMs(routed) network: 192.168.122.0/24 I have VMs connected to libvirt's routed network. <network> <name>routed-122</name> <uuid>86ca64a6-7fea-4cf8-...
0 votes
2 answers
351 views

How does GRE interface route packet to remote endpoint

I have the following topology which I configured to run a GRE tunnel between my Desktop and the wireless router. On the PC: ip link add l2gre0 type gretap remote 192.168.0.103 local 192.168.0.10 On ...
1 vote
0 answers
237 views

Is it possible to bypass linux bridge device and assign linux vlan directly to bridge member on proxmox (Debian)?

I came up with the following situation. We have a Proxmox node with a 40gb Mellanox QSFP+ card connected to switch. The 40gb interface is added as a slave to vlan aware linux bridge. To that bridge ...
0 votes
2 answers
2k views

linux bridge vlan-aware and untagged traffic

I have the following use case. A machine which runs VMs that have to be located to a VLAN with ID 166. The traffic must go out of an physical interface enp89s0 which is connected to the primary ...
0 votes
0 answers
107 views

Public IP on KVM VMs and DNS setup on host machine

I'm using KVM to create two VMs for hosting NMS servers for the company's devices. I want to manually assign a public ip to both VMs and the host machine (Ubuntu 22.04 desktop [although I mostly use ...
0 votes
0 answers
84 views

I cannot see my OpenVPN TAP adapters in Hyper-V external switch bridging

I cannot see my OpenVPN TAP adapters in Hyper-V external switch bridging. Is it even supported in Hyper-V? I do not see any documentation where it says it is either supported or not. I have Windows 11 ...
0 votes
0 answers
123 views

OpenVPN assign client same ip address as static address on router network

I have an OpenVPN server running on a machine behind my home router, and two clients, one Macbook and one iPhone. When I'm not using OpenVPN, I can statically assign IP addresses to the Macbook and ...
0 votes
1 answer
314 views

No layer 2 traffic in an Open vSwitch bridge

I see no traffic in layer 2 and above in an OVS bridge, but I do see layer 1 traffic. I have the following setup: I have created a Linux VirtualBox VM with three adapters: NAT with port forwarding the ...
30 votes
4 answers
16k views

Docker breaks libvirt bridge network

This issue is driving me crazy. I run a fresh install of Ubuntu 18.04, with: ufw to manage the firewall a br0 bridge lxd and libvirt (KVM) I tried stock docker.io package and packages form docker's ...
1 vote
1 answer
293 views

nftables: getting a per-port whitelist to work

Setup: Ubuntu 20.04, created a bridge "br0" with brctl, added three physical ports to it: enp10s0, enp7s0 and enp5s0. The desire: enp5s0 and enp7s0 should be able to talk to each other on ...
0 votes
0 answers
182 views

proxmox / ovh ip failover and bridge

I have installed both Lubuntu Desktop and Ubuntu Server on Proxmox VMs. However, I don't have internet access on either of them. I followed this tutorial, but I still don't have internet access: https:...
0 votes
0 answers
23 views

Bridged mode does not present network address, but instead 10.0.2.15/24

Host OS: Windows 11 Guest: GNU/Linux Debian 11 Versión VirtualBox: Versión 7.0.6 r155176 (Qt5.15.2)
0 votes
2 answers
172 views

Gentoo hangs when adding main interface to the bridge

I've VPS on WEDOS serverhosting, Gentoo there. 5.4.38 kernel. I've a network interface eth0, I need to bridge it with another one (from openvpn). Starting with adding only one interface: brctl addbr ...
1 vote
1 answer
672 views

Bridge interface causes high CPU utilization

We are facing a weird issue with a server we have on our laboratory. Specifically, the server shows high CPU utilization from low priority processes (blue color in htop) with 50% of the cores ...
0 votes
0 answers
2k views

ARP Reply is not forwarded to TAP device through Linux Bridge

Create two TAP devices, each of which will be read and written by the userland protocol stack. In addition, the two TAP devices are bridged by the Linux Bridge. The script to prepare the environment ...
19 votes
9 answers
53k views

Is there a way to determine which virtual interface belongs to a virtual machine in a kvm host?

I'm using qemu/kvm whith bridged networking. In the host machine there are several "vnetX" network interfaces without IP. I'm looking for a way to know which vnetX belong to a virtual machine. I ...
2 votes
2 answers
538 views

Strange issue with bridges on Ubuntu server and libvirt; looks like MAC address conflict

We have been using bridges and libvirt VMs for a long time (starting with Ubuntu 16.04). Recently, we have encountered a problem with bridges (on VLAns). We have not yet identified what conditions ...
1 vote
1 answer
1k views

OpenVPN bridging with server and multiple clients?

I am setting up a bridge that will connect two or more disjoint physical networks in the single shared "ethernet space" (e.g. I want everything to work like it is plugged into one Ethernet ...
0 votes
1 answer
117 views

Bridge Becomes Unresponsive (must reboot)

We noticed in some of our hardware that our switch (an integrated KSZ9477) stops responding, with the logs showing the following: [ 9585.977985] ksz9477-switch 0-005f port1: Link is Down [ 9585.983206]...

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