Questions tagged [bridge]

A network bridge is a network device which transparently forwards packets between two or more network segments so that they appear as one local area network (LAN).

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network bridge not detecting particular device, how to troubleshoot?

I'm on 18.04 ubuntu, I have a bridge br0 setup(static 169.254.0.10) that is working with some network devices(169.254.0.40, 169.254.0.50). I have a 3rd device(169.254.0.60) that I want to connect to ...
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Create bridged connection for VMs without losing host IP/Connectivity [duplicate]

I'm migrating my VM host from VMware to KVM. In VMware, a network bridge is available out of the box. In Linux, it is not. I created a bridge, but when I bound my physical interface to it I lost ...
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Linux bridge: what does master mean in the "ip link set"?

In the following diagram, each color stands for a network namespace, which is connected by a Linux bridge v-net-0. veth-red and veth-red-br are a pair of veth. veth-blue and veth-blue-br are a pair ...
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Who loads bridge.ko modules when Linux system starts?

When my CentOS Linux system starts, bridge.ko and ebtable_broute are loaded, I'd like to know which module is loading these modules. [root]# lsmod | grep bridge bridge 266240 0 stp ...
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Linux bridge, trunk and PVID

Following up my other question I'd like to clarify the following: To configure the bridge interface rather than one of its port, the additional keyword self is needed. The routing stack (at layer 3) ...
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Linux bridge with trunk ports and self bridge port

I created VLAN-aware bridge with command and add relevant interfaces: % ip link add br0 type bridge vlan_filtering 1 % ip link set dev eth0 master br0 ... (and repeat this for eth1, eth2, eth3) Now, ...
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how to set default gateway after ifconfig. part 2

I have an android emulator on bridge and the network is set up via "ifconfig eth1 192.168.41.100" The bridge is 192.168.41/24 and gateway is 192.168.41.1. It works well (it is essentially a ...
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Raspberry Pi bridge eth0\eth1

I have a Raspberry Pi and a device/sensor which connects to the Pi via eth1. Eth0 is connected to my router, giving access to the internet. I'd like to bridge my eth0/eth1, so that traffic from the ...
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Packet Forwarding on Debian 11

I am running Debian 11 on a small form factor box. I am wanting to take all traffic from a network tap upstream on ethernet interface eno2 and output it on sfp+ interface eno8. I've set up bridging ...
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Linux L2 bridge blocks ip packets which are addressed to a listening port on the host

On my Server I have a bunch of vms, connected by a simple L2 linux bridge to an OPNsense VM for firewalling and routing between the vms. The OPNsense vm is connected via macvtap to the single enp3s0 ...
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Why can an interface not simply be added to a bridge?

My mental model of Linux' bridge is wrong. I have always considered a bridge similar to a simple, unmanaged switch: You plug in some ethernet cables, and data is then copied from one port to another ...
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Run > 1024 docker containers

Normal Docker is limited to 1023 containers due to the bridge being limited to 1023 MAC addresses. But what if you have several bridges? Can you then have more than 1023 containers? And can you ...
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Redirect specific traffic between two port on same device

I have two running SIP applications on a Debian buster server, one app use port 1000 (a softphone) and another one using port 2000 (VoIP server like FreePBX). both of them are on the same machine and ...
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Bridge gets random MAC instead of port address

I have a fresh install of Debian 11 and did a bridge setup: auto br0 iface br0 inet dhcp bridge_ports eno1 What I expect is that br0 has the same MAC address as eno1 but it gets a randomly ...
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How can I MASQUERADE between vlan bridges

I have created two VLAN bridges in openwrt based system which has single physical interface. *) eth0->lan->br-lan *) br-lan->br-lan.2(VLAN INTF)->br-vlan2(BRIDGE INTF) *) br-lan->br-lan....
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Proper Isolation of Bridge Networks

Proper Isolation of Bridge Networks I am trying to set up a private network space, isolated from a public network space. In the public space, I want my guest OS NIC to get it's IP address via DHCP ...
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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     ...
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dockerd failed to start daemon: list bridge addresses failed

Exacactly the same issue as Failed to start Docker Container Engine, as I'm getting dockerd failed to start daemon: Error initializing network controller: list bridge addresses failed: ...
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VMware - Can't ping host machine and VM even in bridged mode

I have set my Ubuntu virtual machine in bridge mode so that my VM could communicate with my host machine but I can't seem to receive any ping replies from both ends. My host machine is windows 10. ...
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How to ssh from host into Qemu VM through its hostname, not its IP?

I created a QEMU VM, both host and guest being ubuntu 20.04. Then I created a bridge network and attached it to the VM using Virtual Machine Manager in hope of ssh from host into guest. Now I can do ...
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Systemd-networkd bridge not being created at boot

I am trying to create an ethernet bridge with systemd-networkd so KVM guests can access the network. I am on Debian 11 Bullseye, attempting to create bridge "host1" on physical device "...
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Howto hook a Guest to a `tun` Interface

I'm trying to force all traffic from a guest (Windows or Linux) to go through the VPN of the host (Linux). To make sure that a guest has no access to the internet outside the VPN, I establish the ...
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DHCP client ordering question - bridge vs. physical interface

I'm on an Ubuntu system with a couple of physical NICs and one configured bridge0 interface (to provide internal VMs and containers with access to the rest of the LAN.) I have a MAC address ...
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How to make Linux bridge act as a hub instead of a virtual switch?

I'm using virt-manager and qemu to run virtual machines. I had a task I needed to complete that involved sniffing traffic from another VM from a Kali Linux VM. Because the bridge network acts as a ...
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Bridge WiFi and Ethernet on Debian, with separate WWAN

There are similar questions already, but I can't follow their descriptions. Here's what I have: +-----+ +--------------------+ +----------------------+ +---------------+ | |...
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How do you bridge route (broute) just ipv6 from a single interface to an existing bridge?

The setup that prompted this question and the solution below to make life simpler for the next person. I have a dd-wrt router. It bridges eth1, eth2, and vlan1. It routes them through vlan2 which has ...
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ebtables to stop traffic from one port of the bridge to another port

In my setup, we have a linux bridge br0 that contains ports as below. bridge name bridge id STP enabled interfaces br0 8000.00a0574c49c3 no eth0 athx athy tun0 eth0 is a normal ethernet interface and ...
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Routing data from host to Qemu in Linux

I am sending some data from Canoe in Windows to Linux host. I am able to receive to Linux host PC. Now I would like to route the data from Linux host to Qemu but I am not able to route it to qemu. I ...
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Open vSwitch inter bridge communication

want to ping different Open vSwitch bridges via a physical interface. My host has an eth1 and a wlan0 interface. I have created 3 OVS bridges and assigned IP addresses to them. wlan0 added to br0. Two ...
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Bridge PPPoS with ethernet

I have a PC on a test bench with 2 interfaces, enp2s0 and enp3s0. The IPs are public and obtained with DHCP, based on the interfaces MACs. There is a second computer on my bench, a Raspberry Pi ...
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IP forwarding, masquareding, NAT

I have one physical interface eth0 on my target, running Linux. The IP address of this interface is 172.16.81.x (public IP). I have to create a virtual interface eth0:1 with IP address 173.1.1.x. I ...
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Route to external network with multiple NICs connected to one Linux bridge?

Assume a machine has 2 physical NICs (eth0 and eth1), and both of them can access external network. Then a bridge br0 is created with both eth0 and eth1 added to it (IP addresses are removed on eth0 ...
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Qemu virt-manager setup bridge from wireless interface

I want to make my virtual machines visible in LAN using the 192.168.1.0/24 ip addresses as if they are a separate device in my LAN. Every tutorial I find has instructions about how to do it via ...
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ProxMox OpenVSwitch with Guest pfSense Firewall

Here's what I'm trying to setup: Proxmox will be top-level main machine that will have 16x ethernet ports. I want to install pfSense as guest here and make it main gateway, firewall and where VLANs of ...
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How to forward packets between different bridge?

We have two bridge interface br-office and br-guest on the OpenWrt AP, use external DHCP server, network topology such as: Internet 1 Internet 2 ! ...
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windows vm on ubuntu quemu host

after seeing several guides on the internet my confusion has become stellar! What I would like to be able to do is a windows virtual machine (hosting a website) on ubuntu host (18.04) server / qemu. I ...
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Automate bringing up bridge with systemd

When I reboot my card, the interfaces seem to be deleted from the bridge! here is how I make the bridge work: I create these 3 files: /etc/systemd/network/19-gfxbridge.netdev [NetDev] Name=br0 Kind=...
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Figure out who create bridge interfaces

There is some process that create network bridges and I couldn't find who does it. The system is Ubuntu server 20.04.2. /etc/netplan is clean, nothing in the journalctl. What could it be ? $ brctl ...
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Cant create working bridge using on Ubuntu in Hyper-V guest

Using Ubuntu 20 and a Hyper-V virtual machine I cannot create a working bridge - however the exact same commands work in VirtualBox. I am not a sysgod - so please excuse my explanation. I need to ...
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Redirect rtsp video stream from Ethernet to WiFi network within same device

I have a embedded board with yocto based minimal linux without GUI. It has Ethernet and WiFi interface up and running. Now, I have connected Axis F44 (192.168.30.35) camera to my ethernet port (192....
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Why two bridged veth cannot ping each other?

I need to set up a network environment where two veth interfaces is attached to one bridge and they need to be able to communicate with each other. So I execute the following commands in a clean ...
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2 votes
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“IEEE 802.11: disassociated” messages when using OVS bridges and wifi APs

I've created an OVS bridge/patch ports on a Raspberry Pi (let's call it Pi3) with 2 wireless adapters (wlan1 and wlan2). I also have 2 Raspberry Pis (Pi1 and Pi2) with 1 wireless adapter each (wlan0) ...
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Bridging with Wifi not working on Debian Buster

my Linux skills are rudimentary at best, but I am trying to learn. So please be considerate of that fact, considering this question. I have a laptop that I have installed Debian Buster on. I need to ...
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How does arp_process() replies to the right device?

Looking at Kernel source code I see that when processing ARP request the net_device is retrieved right from the skb, and then seems like the reply is sent to that device (arp.c#L679): static int ...
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Unable to delete network bridges on Fedora 33 & Docker

I am using Docker 20.10.7 on Fedora 33: $ uname -r 5.12.8-200.fc33.x86_64 $ docker -v Docker version 20.10.7, build f0df350 When trying to create a new docker network, I get the following error: $ ...
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Where is the MAC address for a bridge interface stored?

I recently cloned an SD card containing ubuntu for a Raspberry Pi to a HD. I then decided to use the SD card in a different Raspberry Pi and ran into a MAC address/IP Address conflict (both Pi's were ...
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Docker:Error response from daemon: failed to create endpoint mvpn

Everything was working, but after creating a 1022 container suddenly I am getting this error: docker: Error response from daemon: failed to create endpoint mvpn-1023 on network bridge: adding ...
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Bridge between Physical Ethernet and VLAN possible?

I would like to do something but I dont know if its possible. I have router edgemax edgepoe4: Eth1 : receive a tagged vlan 10 Eth2 (No TAG traffic) : no vlan define, DHCP server defines to connect ...
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VLAN switching between trunk ports on CentOS

I am using CentOS Linux release 8.3.2011 and am struggling to set it up as a switch. The network topology is as follows: [switch1]--------[vsphere]--------------[centos]--------------------[vRouter] ...
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Why Linux has "bridge" link type, and not a "switch" [duplicate]

In Linux, we can have a virtual bridge device. It is used i.e. by Docker, which creates a default "docker0" bridge. Since in networking bridge is a similar device to a switch (and switch is ...
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