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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netplan + libvirt - Should I set up virbr0 virtual bridge?

As far as I understand, the interfaces virbr0 and virbr0-nic are created and managed by libvirt. ● 4: virbr0 Link File: /lib/systemd/network/99-default.link Network File: n/a ...
Norman Pellet's user avatar
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How to manually setup Whonix networks for QEMU?

I would like to run Whonix directly using QEMU instead of using libvirt and I want to manually setup internal and external network. Using libvirt I would need to run those commands: virsh net-define ...
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How to bridge two interfaces while not connecting to it, and use a third interface for network

I am on Linux - Ubuntu 20.04, I am trying to use a 4G USB key that is shown in the interfaces as "ppp0" (created using wvdial) to bridge the secured 4G connection to a sensitive network ...
Marc-André Bouchard's user avatar
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Bridge not forwarding the neighbor advertisement

I have a bridge created using libvirt and two VMs. I can ping both VMs using ipv4. However, when pinging using ipv6 addresses, it does not work. I can see the neighbor solicitation leaving VM1 and ...
mosquetero's user avatar
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Huawei HG8245Q2 connected with other router in bridge mode and WiFi with internet access

I have Huawei HG8245Q2 router with GPON WAN and 4 ethernet ports and powerful WiFi module. Behind this router I have second (Mikrotik) router and a L2TP server on it. Unfortunately - Huawei router in &...
Kamil's user avatar
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KVM guest in local network using bridge - I can see VM

I create bridge br0 (10.10.10.2) which use phisical eno2 and vnet0 for VM (10.10.10.121). On Host everything is OK i see VM, VM see Host and Internet. BUT ... I can't See VM from other computers in ...
Piotr Topolski's user avatar
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Networking start failed on OVH Proxmox 6.4 if a bridge has no interface

We are setting up a new Proxmox 6.4 (based on Debian 10.9) host on OVH (Advance-2) hardware, using the OVH provided template. In order to create a "virtual" bridge for VMs and LXCs, we added ...
David Le Borgne's user avatar
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Docker: How to give container access to network bridge on host? VPN-over-VPN

I'm trying to dockerize a vpn-over-vpn setup that I've been using to bridge two lan segments over another VPN connection, but I'm running into a roadblock that seems like there should be a solution ...
Tom's user avatar
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Use network bridge as default network in libvirt

I created a network bridge virtbr0 with my NIC enp1s0f1. The bridge gets an ip address from the router via dhcp. i would like to use the bridge as default network in libvirt to also get ip addresses ...
br0ken.pipe's user avatar
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linux ipv6 bridge address does not work when mac address is forced

While playing with linux bridging and ipv6 on ubuntu focal, I met an issue that I would like to understand. When I manually set the bridge mac address, bridge ipv6 address is not working anymore, why ?...
Chaoxiang N's user avatar
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veth does not respond to other veth ping requests on same bridge

I created two veth pairs and connected them to the same bridge. However, they do not respond to ping requests. This is ubuntu 20.04. # create the interfaces and bridge sudo ip link add br0 type ...
John Karasev's user avatar
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Debian KVM bridge promiscuous mode still has IP

I had three interfaces working on my Debian KVM box, all three bridged to guest VM's, f0 was mgmt, f1 was public static, and f2 was working promisc bridge. When I reinstalled the OS on larger drive ...
batflaps's user avatar
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DHCP not working for bridged QEMU virtual machine

Environment: A router with DHCP server. This router manages a subnet of 172.16.0.1/16 A host with Ubuntu 20.04 installed, and it has a NIC named eno0. A QEMU virtual machine running on host. Purpose:...
Douglas Su's user avatar
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Can't quite figure Linux VLANs out

I've spent the better part of 3 days trying to get this simple example working, I can't really find any cohesive information relating to my problem, I guess people don't turn Linux hosts into Switches ...
daniel walton's user avatar
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3k views

How to create Bridged connection for Qemu/KVM with Wifi?

I want to create a bridged connection in qemu/kvm. What I want to do is connect the wifi to a bridge (as a slave), then use this bridge to provide network access to the VM. Using nmtui, I deleted my ...
Matan L.'s user avatar
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Name resolution for dummy interfaces

I've a virtual NIC of type NAT on my Ubuntu 20.04 virtual machine which connects it to the internet via host. For some processing, I need to route all incoming and outgoing packets via a program I've ...
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How to bridge an internal network interface to an OpenVPN tun/tap device

I'm using a two-VM setup wherein the first VM, machine A, has a closed, private LAN shared with the second VM, machine B, which has a second network interface that is configured to hit the internet. ...
Qix - MONICA WAS MISTREATED's user avatar
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redirecting udp traffic from one network interface to another on the same host

My host has two network interfaces: eth0:172.16.125.5 eth1:172.165.8.55 I want to redirect all UDP traffic to eth1 port 1234 to eth0 port 1234, ie: 172.165.8.55:1234 -> 172.16.125.5:1234 After ...
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Routing traffic from a bridge interface (with IP assigned) to another network on a different local interface

I'm on Ubuntu 20.04 and am running virtual machines (KVM) locally that are attached to a bridge interface on the host. The bridge (and all VMs attached to it) are getting their IPs via DHCP from a DSL/...
Tobias Gierke's user avatar
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Debian: On same NIC, bridge plus distinct IP address, with different MACs

Debian host. I have a single NIC that's supposed to sit on two networks; on 172.16.0.0/24 and 10.0.80.0/24. On the 172.16.0.0/24 network, there should be a bridge, so that local KVM hosts can attach ...
Patrice Levesque's user avatar
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Openstack instances cannot access Internet [linuxbridge]

I am having serious issues in the deployment of the Openstack scenario related to the Linux Bridge. This is the scenario: Controller machine: Management Interface enp2s0: 138.100.10.25. Compute ...
Jaime Saez's user avatar
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Why set primary interface to `manual` (off) when adding a bridge network?

I am playing around with KVM and bridge network on a Debian 10 Host Many tutorials tell to set the /etc/network/interfaces to something like this: # The primary network interface auto eth0 iface eth0 ...
TomGrill Games's user avatar
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Attach a host network interface to a VM and ping other hosts

I have an Ubuntu 18.04 host with a pr0 interface, that is connected, via a hardware bridge, to other hosts in the network. I have created a virtual machine (at my host), using KVM (virsh) and I want ...
Chris's user avatar
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3 answers
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VLAN support with libvirt for linux bridge to virtual machines

I'm using systemd-networkd to configure network interfaces managed by libvirt for KVM (Kernel-based Virtual Machine) with Debian Bullseye on all nodes. I want to have transparent VLAN support on the ...
Ingo's user avatar
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Linux bridge does not forward packets to TAP interface

I have the following scenario where I run a Docker container which has configured inside of it a Linux bridge br0 and attached to it I have the main interface eth0 of the container and a TAP interface ...
Mazzy's user avatar
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Cannot communicate from host to container and vice versa

I have a GitLab instance running in docker. But I am unable to ping or curl the port 8000. CONTAINER ID IMAGE COMMAND CREATED STATUS ...
Athul P's user avatar
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Routing with nftables (Fedora33, nmcli, brctl)

A/ Host (Fedora 33) with Ethernet if eth0. ip 192.168.18.11(/24) and B1/ Kvm guest with if vnet0 enslaved to virbr101. ip 192.168.101.88(/24) (manual routing, static IP) or B2/ Kvm guest with if vnet1 ...
asoundmove's user avatar
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Using Debian as host for Virtualbox - problems with network

I have been banging my head on this for awhile. Im somewhat new to using Debian as a host/router for virtual machines and Im strugeling to get remote access to my VMs. My setup is like this: Server ...
andhaa's user avatar
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2 votes
0 answers
175 views

Debian 10: activating bridge interface on remote host freezes ssh connection

I am working on a fresh installed Debian Buster installation on a remote host located in a data center elsewhere. I have a script ready to copy the working standard /etc/network/interfaces back in ...
Torsten's user avatar
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Bridge created vm not receiving packets + firewalld

I’ve create a bridge into cockpit on the main interface of this fedora server host. I want to be able to access VM like any other host and I wanted to proceed step by step and not create a forwarding ...
vigilian's user avatar
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Attach a VM to a host TAP or TUN device

I'm working on a project whilst in lockdown in England, and I am hoping someone can offer some advice? I have a machine with 5 physical eth interfaces on Linux Mint, 20.04. All eth interfaces ...
Bon's user avatar
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1 vote
1 answer
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Proper way to configuring docker network bridge on the host side

Edit: Note that I'm referring to a single host setup, some local server architecture and not some enterprise-grade backend :D docker network create with the bridge driver creates an actual bridge ...
HLL's user avatar
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1 vote
1 answer
336 views

Xen Domain0 Has Network But DomainU does not

After re-installing my domain 0, a guest VM (domain U) is no longer able to connect to the network. I am using Ubuntu 20.4 on my Domain 0 with Xen 4.11. I am able to successfully connect to internet ...
curios's user avatar
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2 votes
1 answer
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How to configure the AT&T (Arris) BGW-210 router for IP Passthrough using static IP(s) and pointing to UniFi Dream Machine Pro?

We are setting up AT&T fiber internet with 5 usable static IPs and the Ubiquity UniFi Dream Machine Pro (UDM-Pro). I would like to configure the BGW-210 to act as a bridge to the UDM-Pro. I found ...
Swisher Sweet's user avatar
1 vote
1 answer
695 views

Set up KVM host with multiple VLANs, each attached to "its own" external IP address

I'm trying (and having a hard time) to setup a clean KVM environment with: an Ubuntu (20.04) host (with a single NIC), multiple ubuntu KVM guests, 2 public IPs, and one Vlan per IP. Basically ...
Milan Rodriguez's user avatar
1 vote
1 answer
1k views

Multicast not working on macvtap device

I have a problem with my virtual network and IPv6 network discovery (multicast traffic). (The setup might seem a little bit involved and I don't remember the exact reasons for every design decision. ...
bug.spencor's user avatar
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644 views

Are network bridges still in use today?

I've been wondering if bridge is still used by today , because i rarely seen it .Are there any networks thing such as bridge that replace bridge for today? If bridge still used by today what kind of ...
Jeanny's user avatar
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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 ...
ptselios's user avatar
2 votes
1 answer
2k views

Docker macvlan need to publish ports?

I'm doing a macvlan bridge... now the question comes spontaneously ... Being that with macvlan, the container is exposed directly to the network, does it need to expose the ports with the -p option at ...
MrTaik's user avatar
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1 answer
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Adding a VLAN (over bond/lacp) interface to bridge makes physical interfaces to go down

I have a working configuration of a team interface bonding two physical interfaces, with several VLANs. ens1f1 ----- |--- team0.1826 (172.18.x.y/28) |--- team0 -----|--- team0....
Alex's user avatar
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Bridge interface with VLAN tagging

I need my Proxmox instance to accept traffic from another VLAN and I'm having trouble with setting the interface correctly. I have 1 NIC, I've configured a port on my switch as a trunk interface, now ...
dywan666's user avatar
  • 160
1 vote
1 answer
1k views

Should a bridge device and network interface card share the same IP address?

If I create a bridge device and then set it as the master of my NIC then it appears that both devices have the same IP and two mac addresses. Is this correct? 2: eth0: <BROADCAST,MULTICAST,UP,...
Chris_F's user avatar
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1 answer
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Bridged OpenVPN Tunnel not working properly

I'm stuck with a problem: I set up an P2P OpenVPN connection between two sites. I added the VPN TAP Interfaces into a bridge on either side. Client side: # brctl show bridge name bridge id STP ...
jogo's user avatar
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1 vote
0 answers
613 views

How to connect host only to network bridge with QEMU VMs on linux host

I have a bridge working for qemu. I am able to start multiple copies of the same machine and they can network together. I am not interested in connecting to the outside internet. This is all on ubuntu ...
sn0wbl1nd's user avatar
0 votes
0 answers
477 views

MAC address timeing out of the Linux bridge

We stumbled upon a weird behaviour (well, everything works according to specifications but it should be somehow tunable and/or I would like to know how to properly set it up) in linux bridge or ...
ILikeMatDotH's user avatar
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0 answers
31 views

VLAN 'Bridging' for Core on Multiple Networks

I think I have a very unique use-case that I need help with since I am not a network engineer. Here's the layout. I help operate a gaming floor network for a Casino. The thing that I noticed right ...
Duane Gatewood's user avatar
1 vote
0 answers
716 views

Difference between VMWare Bridged network and Docker ipvlan/macvlan?

In Virtual Networking, I have seen two techniques to connect the guest machine with the Host machines network. In VMWare/VirtualBox - Bridged Networking is used to connect the guest machine with the ...
samshers's user avatar
  • 238
1 vote
1 answer
519 views

Does the linux bridge have in-built DHCP and DNS server? [closed]

Does the linux bridge have a dhcp server built in to the bridge software? And does the linux bridge support working as DNS-Server or it can only point towards the DNS server on the host or none. If ...
samshers's user avatar
  • 238
2 votes
1 answer
1k views

Bridging two (a physical ethernet with a virtual ethernet) different subnets on linux?

I am thinking if it's possible to create a bridge while allowing each bridged network to exist in it's own subnet. Network 1 - Say, I have a physical ethernet based network eth01 - with subnet 192....
samshers's user avatar
  • 238
5 votes
1 answer
966 views

In virtual networking, how does a Virtual Switch differ from a linux kernel bridge?

I have seen that in virtual networking, guest VMs/containers can be connected with host and internet either by using kernel bridges(linux) or Virtual Switches. Example - Bridges docker uses linux ...
samshers's user avatar
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