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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How to route traffic from clients to a proxy using iptable/ebtables

I have a raspberry pi which a bridged wireless access point with 3 interfaces: wlan0 eth0 br0 br0 is a bridged wireless access point to wlan0 eth0 is connected to the a router (internet) How can i ...
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What could be the reason that docker bridge networks are not able to communicate with the world after an upgrade from debian 8 to 10?

I know, this question is very specific. After a whole day, I gave up and installed a clean Debian 10. Because on a system that got upgraded from 8 to 10, it was impossible for me to find the reason, ...
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GRE Tunnel subnet /29

I watched this tutorial: https://www.lowendtalk.com/discussion/156850/howto-tunnel-ddos-protected-ovh-ip-to-vms-in-other-datacenter And I have problems with the GRE tunnel, I created a VPS on server 2 ...
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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 ...
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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 &...
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Adding macvlan device to traditional bridge

So, a little background first. I have a CentOS 8 host running a bridged OpenVPN instance with a TAP device. I also have docker running, and with that I've created a macvlan docker network so I can ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ?...
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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 ...
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Slow ARP Update using Windows and Linux Bridge

I have an issue with the ARP update if I switch between to networks. The diagram show my current network consisting of a Windows 10 PC (client) a switchable bridge (in the middle) and two linux PCs ...
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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 ...
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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:...
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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 ...
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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 ...
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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. ...
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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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Linux rhel / centos, configure network bridge between two interfaces to communicate with secondary host (Using VMware)

Need I have two Linux hosts. Host1 and Host2. I need to be able to communicate with host2 on our network through a bridge built on Host1. Problem: br0 is pingable, but when ens161 and ens192 are both ...
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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/...
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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 ...
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How do I create a Private Network Bridge between two KVMs through virt-manager?

I have a server hosting a firewall as a KVM with two Ethernet devices assigned as passthrough. The firewall is OPNsense. On the same server I want to run another server as a KVM and pass all the ...
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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 ...
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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 ...
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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 ...
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451 views

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 ...
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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 ...
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Multicast not received when socket is bind to bridge interface on linux

I have bridged eth0 and eth1 to br0 on a linux system. No other interface on the system, only one default route. I want to receive mutlicast traffic with a gstreamer udpsrc. When setting the interface ...
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Hetzner vswitch with public addresses using router - how to get to the internet?

I am using a Hetzner vswitch with some public IP addresses and I want to use them on some virtual machines. The whole config is as described in my larger question where I say that it feels like data ...
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VLAN tagged bridge to virtual machine - seeing network chatter but ssh/ping don't work

I have a VLAN-tagged network going through a bridge to a virtual machine, and I can see network traffic on the virtual machine using tcpump, I can't ping or SSH it. I run tcpdump -n -e -i br4003 host ...
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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 ...
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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 ...
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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 ...
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vmware on Ubuntu 16.04 bridge automatic settings on virtual editor do not save on quit

I am having a problem with permanently saving my configurations in vmware virtual editor on Linux. First I opened the editor gui using vmware-netcfg from root of terminal but after removing all other ...
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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 ...
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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 ...
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Should SNMP ifHCInUcastPkts counters include packets bigger than 1522 bytes?

Packets bigger than 1522 bytes (as counted by Spirent Test Center) are being forwarded (bridged) but not counted in the following hardware counters on an Open Network Linux device: ifHCInUcastPkts ...
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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 ...
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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 ...
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NetworkManager fails to bring bridge on boot

On a newly installed Debian 10.6 I added a bridge with one slave: $ nmcli c show br0 connection.id: br0 connection.uuid: 0de37d79-84b5-4715-a5c2-...
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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 ...
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Bridge configuration with containers and a dummy interface

My setup is as follows: Host A ====== br0: mac 04:11:22:33:44:55 vf0: mac 04:22:33:44:55:66 dummy0: mac 04:33:44:55:66:77, ip 10.0.209.2/32 veth0 end in container a: mac 04:44:55:66:77:88, ip 10.0.209....
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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 ...
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Creating seperate virtual network interface on OS X command line and bridging it with physical link

I have 1Gbit fiber connection attached via Ethernet to my MacBook Pro with 10.15.7. Occasionally I run nmap scans but it eats all available bandwith making the computer hardly usable - even DNS ...
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211 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 ...
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382 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. ...
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70 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 ...
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596 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 ...

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