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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 create bridge (br0) in Vagrant using private network

I have brought up Vagrant machine with private_network. It creates eth1 interfaces. I want to create bridge using that IP. After vm is up, if I create br0 with the same IP and remove the IP from eth1, ...
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Using Linux server to interconnect 25Gbps and 1Gbps LAN segments

A local network 192.168.1.0/24 that I administrate, was operated at 1Gbps Ethernet. Recently, we got some new switches and machines capable of 25Gbps Ethernet (all DACs). The new 25Gbps switch does ...
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Issue with STP putting links to Blocking between multiple linux hosts without physical switches in between

Have the following network topology between Linux (RHEL 8.6) hosts, no physical network appliances between the hosts: bridge link show command output on Host A: ... 33: br0-1: <BROADCAST,MULTICAST,...
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MikroTik VLAN AccessPort doesn't work

I have a problem with configuring access port on my MikroTik CRS312-4C+8XG-RM. Below, I show you my config. I expect that on combo4 I can connect my computer to my VLAN10. In general my network works ...
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Ubuntu server 20.04 does not initialize systemd script!

I'm trying to put a script to run at Ubuntu startup via systemd, but the same error occurs and the command is not executed, the script is used to raise the tap interface, and make the bridge with the ...
Adsuporte's user avatar
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Iptables forwarding outbound packets to another port of LAN bridge

I just built a router running Debian with iptables, DHCP, radvd, etc. Let's for the simplicity say the router has 3 ports enp1s0 to enp3s0. I used enp1s0 as the WAN port and created a bridge br0 for ...
CodeDuck's user avatar
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Multiple virtual routers on a single machine

As part of a production line, I need to test that a device is able to connect to the internet through its ethernet port. Each device will have a unique set of: static IP/netmask static gateway IP DNS ...
Jasper's user avatar
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how to confugire routing for bridge interface

I have a Linux machine that I operate in transparent mode using bridge interfaces that I created using brctl. One member of the br0 is external, and the other member is internal interface. In the ...
iamaduwb's user avatar
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Losing connection when connecting br-ex to bond - openstack

I want to configure openstack on a bond with a private static IP address and I also connect to the server through the same bond. I realized as soon as I connect the bond to br-ex I get disconnected ...
Sol's user avatar
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KVM Routed Bridge for Additional Subnet on Hetzner Using Netplan

I have a dedicated Ubuntu 22.04 server at Hetzner running KVM. I have assigned IP addresses from an additional subnet to guest VMs. I can reach the guest VMs via their public IP addresses as intended. ...
Kheldar Ambar's user avatar
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How do I replace the main network interface with a bridge on GCP?

What I'm trying to do is launch a bridged OpenVPN server on GCP (in a GCE VM). What looks like a crucial part to me is in the title. If I succeed, the rest is supposedly easy. I tried two approaches: ...
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How to detect which physical interface an IP is being reached through in a network bridge?

I have the linked network setup. network diagram In essence, there is a router that manages DHCP and broadcasts Wifi A, then there is a dedicated access point that broadcasts Wifi B. A station ...
Jack1221's user avatar
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Proxmox linux bridge has binded ip which not works 50% of time

I have default proxmox install on Vultr baremetal server It has bridge like this root@ed2:~# cat /etc/network/interfaces auto lo iface lo inet loopback iface enp1s0 inet manual auto vmbr0 iface ...
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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 ...
farmboy's user avatar
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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....
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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 ...
Kristof Rado's user avatar
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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 ...
Kevin Jones's user avatar
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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 ...
ift-436t's user avatar
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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 ...
Javier Gonzalez Moncayo's user avatar
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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-...
aquilares's user avatar
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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 ...
thunderbolt's user avatar
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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 ...
djshaw's user avatar
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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 ...
Alex's user avatar
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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 ...
Giuseppe Nardiello's user avatar
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2 answers
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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 -> ...
Sacha Weichel's user avatar
1 vote
1 answer
976 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 ...
Taavi Ansper's user avatar
1 vote
2 answers
2k 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 ...
Michael's user avatar
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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 ...
Reinderien's user avatar
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340 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 ...
Lukasz's user avatar
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1 vote
1 answer
810 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 ...
a-kodez's user avatar
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1 vote
1 answer
451 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-...
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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 ...
Haswell's user avatar
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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 ...
The amateur programmer's user avatar
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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 ...
Ballard's user avatar
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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 ...
falhumai96's user avatar
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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)
Nando's user avatar
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1 answer
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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 ...
JamieB's user avatar
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2 votes
2 answers
604 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 ...
rwfbc's user avatar
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2 votes
1 answer
2k 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 ...
xmp125a's user avatar
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1 answer
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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]...
luis.espinal's user avatar
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vm machines cannot ping each other via bridge network [duplicate]

I created vhost1 and vhost2 by using virt-manager which run on a Ubuntu server 22.04 The Host and VMS connected via a bridge network. So here's the thing: The ping working fine between Host and VMS, ...
mdzz's user avatar
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1 vote
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490 views

Linux bridge does not propagate multicast ntp messages

My hardware, based on imx8, has two ethernet interfaces. These are connected together as a bridge, all messages not for this he are forwarded. Everything works as expected except multicast messages: ...
H.Arslan's user avatar
1 vote
1 answer
147 views

What is causing large TCP messages to have low throughput in one direction when using ethernet-to-wifi bridge?

I have two computers, Orin and NUC, which are connected via ethernet cable directly. NUC is connected to a router with internet via WiFi (for completeness, not relevant to problem, I hope), and is ...
Joshua O'Reilly's user avatar
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Bridge between networks

I'm beginner and I'm trying to set bridge between two networks in Virtual Box. I've created two VMs (Debian1 and Debian2) and for network settings I set Debian1 to intnet1(Internal network) and ...
themdd's user avatar
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342 views

Bridge not reaching internal network for OpenVPN Ethernet Bridge in a Ubuntu 22.04 VM on ESXi

I want to set up OpenVPN Ethernet Bridging. I'm following the steps from https://openvpn.net/community-resources/ethernet-bridging/ and after setting configuring the bridge as described in https://...
ThmX's user avatar
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1 vote
1 answer
606 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, ...
amkgi's user avatar
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4 votes
1 answer
418 views

Linux: STP does not converge among linux containers

I'm trying to create a lab in GNS3 with docker containers to understand more about spanning-tree. My lab is very simple: there are two Linux/Alpine containers with two links connecting them: -------- ...
José Rios's user avatar
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125 views

Physical/Bridge and KVM ports shows up even after unplugged the cable!

We have Debian 10, it has two physical interfaces which we bridge to KVM. The issue I have is, when I shutdown the port from my virtual operating system or I disconnect the cable the birdge and ...
Himanshu Dua's user avatar
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1 answer
393 views

Can I measure the performance of a linux software bridge using this setup?

I need to measure the performance of a linux network bridge (https://wiki.archlinux.org/title/Network_bridge) on a particular machine (machine A). My initial idea for a setup looked like this: ...
mortelsson's user avatar
1 vote
1 answer
801 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 ...
Dimos Masouros's user avatar

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