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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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 ...
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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 ...
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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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 ...
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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
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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
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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 ...
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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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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 ...
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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 ...
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1 answer
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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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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 ...
Giorgos Amoiridis's user avatar
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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 ...
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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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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 ...
falhumai96's user avatar
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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 ...
jameszp'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 ...
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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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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:...
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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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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 ...
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2 answers
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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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1 answer
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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]...
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how to filter bridge interface packets with single iptables rule?

I want to filter br1 interface in/out packets that have a specific tcp port number. Given a setup with eth0 and eth1 in a bridge br1: | | eth0 eth1 | == br1== | ...
pentiumcu'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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0 answers
439 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
136 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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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
402 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
346 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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107 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
335 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
684 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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1 answer
160 views

Ubuntu ethernet bridge limited to 1Gbs?

I have an Intel 522SFP network adapter in a Ubuntu Server machine and I am facing a strange issue with speed. If I use it "directly" with this netplan (enp1s0f0 interface) : # This is the ...
Karnalta's user avatar
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1 answer
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IPV6 conflict VM Ubuntu 20.04 - Netplan

I have a problem, I've two virtual machines, but the problem is that when I turn on the second VM I lost the connection on the first one and vice versa. Here is the bridge netplan configuration on the ...
Irkoska's user avatar
1 vote
1 answer
573 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=...
Mazzy's user avatar
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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 ...
Mazzy's user avatar
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2 answers
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Debian 11 network bridging issue

Was hoping someone might be able to help with a bridging issue on Debian 11... I can't get it to work and I've been tearing my hair out all day! The bridged interface will not get an IP via DHCP and ...
miroslav22's user avatar
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1 answer
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libvirt with qemu guest, bridged networking does not work

I am trying to get a VM operational and working so my router can forward a high port to its SSH, allowing someone on the Internet to connect to the VM. I am familiar with how to make that part of it ...
elyograg's user avatar
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1 answer
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Two completely independent bridges on one ethernet card, possible?

Docker creates its own bridge, and when there is an existing bridge, it seems that the two collide. I have personally experienced that and multiple sources on the Internet mention about that problem. ...
Damn Vegetables's user avatar
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1 answer
2k views

How to connect veth interfaces to bridge slave ports

This will probably be easier to explain with a diagram, so this is the basic setup: There are 2 containers 10.0.0.1 & 10.0.0.2 running inside a host machine, and I've also created a linux bridge ...
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