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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Share Connection With Bridged Interface Debian To Windows

I have a Debian and Windows 10 VM on a Hyper-V host. The Debian VM gets its connection from the Hyper-V host and bridges the connection to a second network interface so the Windows 10 VM can route its ...
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Setting TCP MSS on a bridge port

I have a VXLAN tunnel between two Linux hosts. This tunnel is carried over an Ethernet link with an MTU of 1500 bytes. At each end, the VXLAN interface is slaved to a bridge, along with another ...
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Transparently bridge network over serial link

I have two Linux devices - for simplicity let's call them Raspberry Pi's - in a box that I want to connect to a network with a singe Ethernet link. Both of them need to be accessible, individually, on ...
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Find the origin of a bridge that is created during startup

Every time I startup my Fedora installation (bare metal), a bridge is created (called br-545f118f3baa). There are no interfaces connected to the bridge. The bridge interface gets an IP address in the ...
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Performing MITM on Bridge Interface

I would like to run mitmproxy on 'host1', a Debian 10 Linux PC in order to view a decrypted TLS session. Host1 has the following network interfaces: eth0 - this is connected to 'target', the machine ...
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MySQL ERROR 2007 (HY000): Protocol mismatch; server version = 11, client version = 10

It's not clear whether this has more to do with port collision or something related to "X protocol" and perhaps disabling "X protocol" or changing its welcome message. Might this ...
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49 views

Why the physical interface attached to bridge, it can not access by Internet in my case?

I have a network topology like this: you see, the em1(1.1.8.209) is physical interface which I can communicate through Internet. and I created two vm instance: PID 8740 and PID 8817, both use the ...
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How to check whether a bridge connected to physical interface?

In my CentOS 7.7 server, I use brctl show: there get 3 bridges: [dele@att ~]$ brctl show bridge name bridge id STP enabled interfaces br-eb92c719d431 8000.0242d1ce907c no bridge0 ...
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Is it possible to connect an ipvlan to a KVM guest vm? As opposed to a macvlan

I have a nested guest in a shared infrastructure environment with Mac port security. I would like to use a unique public Ip on this vm, however all outbound and inbound traffic must use the single Mac ...
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Proxy ARP/SNAT MAC address with ebtables to openvswitch bridge

I have a public infrastructure hosted VM with nested virtualization working and have created a single vyos guest assigned to a public IP address I have assigned. The provider has port security enabled ...
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Bridge eth0 to WiFi hotspot as a client

So, I have a raspberry pi4 that I am using as a WiFi signal booster. I have a long range external USB WiFi dongle (wlan0) that is picking up the signal. I am using the pi’s internal WiFi (wlan1) to ...
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Bridge forwards data in Layer3(iP) rather than Layer2(ethernet)

I have some scripts working with bridge & ip netns. It used to forward packets on layer2, but after upgrading my kernel, it seems the kernel forwarding the packets on layer3. In a newer kernel, It ...
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Setting up a Debian Firewall (with UFW) on a bridge connection (wi-fi) — Broken pipe ERROR

Good morning, I'm currently working on the creation of a web server. Here is my setup : MacbookPro running -> VirtualBox VirtualBox running -> Debian 10.04 (only command line) Docker with -> ...
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Bridge traffic not reaching some ports

I have a tunnel between two hosts that is carried over L2TPv3. Each end of the tunnel is slaved to a bridge, as are other interfaces. The remote bridge has a DHCP server attached to it while the ...
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GitLab Coexisting with SSHD on Bridge Interface

Background I am attempting to convert a server from using Docker to Podman. So far I have been able to convert all of my services (~15 in total) to systemd jobs and run them without issue. In doing ...
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bridge mode on ubuntu 18.04 kills network connectivity

I have a server running Ubuntu 18.04 with 3 wan IPV4 IPs assigned to it. The server is running as a KVM host, I'm trying to apply the IPs to my client vms in bridged mode. So far I can apply the ...
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Does libvirt support vlan aware bridges?

I am using libvirt/kvm in Debian 10 with a vlan aware bridge device, and I am stuck trying to configure the network interfaces for my VMs. Does libvirt support vlans? When I do a search the only ...
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How do I set up a bridge network with KVM where the virtual guest is acting as DHCP server?

I want to run a virtualized pfSense server on a KVM host (Debian 10) along with some other virtualized servers. I have a NIC expansion card that I want to passthrough to pfSense. The host machine will ...
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Problem with masquerade and VirtualBox

My host is Fedora 32 with firewalld enabling with masquerade. It has only a wifi network adapter. I have a Debian Buster as a VirtualBox guest that has networking issues, for example, running apt-get ...
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Can I sniff packets on a host interface macvtap through a guest OS on QEMU/KVM?

I have a RHEL server (host) with 4 VMs. One of those VMs is Windows 10 with Wireshark. I want to use Wireshark to sniff packets going over one of the server's ethernet ports, lets call it enp2s0f2. In ...
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Raspberry Pi Ethernet over WiFi Extender

I am trying to build a Ethernet over Wi-Fi extender using Raspberry Pis. Currently, I have one pi (Pi A) acting as a Wi-Fi AP (running hostapd) and another Pi (Pi B) connected to it (running ...
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Set vlan_filtering on bridge correctly [“Operation not supported”]

I'm trying to follow the answer on this question here. Yet, when I try to add a bridge with the "vlan_filtering 1" attribute: pi@raspberrypi:~ $ sudo brctl addbr br0 pi@raspberrypi:~ $ sudo ...
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Using PTP on DSA-Style Switch Makes Packets Look Distorted

So I have an Altera Cyclone V SoC board running Linux 5.7.10 containing a BCM53125 rev4 switch, three LAN ports, and one CPU port (the NIC). Distributed Switch Architecture is in use, so my setup ...
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Bridging WiFi through `network-manager`

I am trying to setup a bridged network between my Ethernet, Wifi, and (future) virtual machines. I am currently trying with NetworkManager because it's already managing the networking on my Debian ...
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Why do we use linux bridge?

I had an argument within my sysadm team about linux bridge, more specifically about how necessary it is to create a bridge in order to add vlan interface. I get (I think) the theory on that linux ...
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Connecting to docker bridged container on CentOS 7 gives: Connection reset by peer

As the title says I have a docker image which runs fine on my development machine in docker using network bridged to an another port (-p 8080:5000). But as soon as I am deploying this on my server ...
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248 views

virbr0 package not installed - qemu/kvm

I am trying to test a custom kernel configuration using qemu/kvm when I do $ virsh --connect qemu:///system net-start default this is the output i get. error: Failed to start network default error: ...
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linux stp with trunk port

I wanted to experiment with stp on trunk ports using Linux bridge, so I created two linux bridges: # brctl addbr br1 # brctl addbr br2 and then: # ip link add veth01 type veth peer name veth02 # ip ...
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Multiple different trunks to KVM guests

I have a host with two physical interfaces, which are in a bond0 and that bond0 is connected to bridge br0. On that bridge I have VLAN subinterfaces (without IP addresses). I need somehow to connect ...
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162 views

Set up Debian networking bridge with DHCP

After a recent bout of package upgrades (but still within the stretch release) my bridge networking to support libvirt VMs seems to have died - the DHCP server does not send an IP to the host nor does ...
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How can I create a virtual test environment for multicast programs?

I am trying to create virtual network devices in order to test and develop multicast programs. My computer has a single NIC with one Ethernet port, which is connected to the Internet. I want a second (...
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KVM client no dhcp with host bridge when docker is running

Ubuntu 20.04 QEMU macvtap (works) If I use following network config: network: version: 2 renderer: networkd ethernets: eno1: dhcp4: yes dhcp6: yes And KVM client network use '...
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wget hangs when downloading ruby file on debian 10

I've got debian10 installed in a new VirtualBox 6.10 image and I'm trying to wget ruby and I'm getting this error; wget -d http://cache.ruby-lang.org/pub/ruby/2.7/ruby-2.7.1.tar.bz2 DEBUG output ...
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Vlan and bridge

Is it possible to drop Vlan tagged packets received on a non-vlan interface(enslaved in a bridge) in Linux, by virtue of some configuration? Can it be done using bridge vlan ingress filter in Linux? ...
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3answers
796 views

qemu/KVM/libvirt usermode networking: VM as a non-root user, what do I need for root-less networking?

I have run several VMs in KVM/qemu with libvirt, and somehow most of the time networking works. Now, networking has stopped working when VMs are run as a non-root user. I have found little helpful ...
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Integrate C Library with Linux Bridge (brctl) to edit packets

I need to deploy a bridging device between a machine and a common network in order to perform some actions to specific packets (protocol-related). The scenario is described in the following image: My ...
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49 views

Add more PCI slots to Virtual Machine

I am running a VM using kvm to simulate a network switch. I need to simulate a lot of links, so all of them are using a PCI connection. If I attach 27 or more interfaces I get an error. Here is the ...
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How can I invisibly insert my Linux box between work computer and home router?

I am having severe issues using work's Cisco's anyconnect VPN. My internet connection is fine. Work's other VPN (non-anyconnect) is fine. Anyconnect not so fine. Unfortunately I am supposed to be ...
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Port forwarding with iptables and firejail sandbox

I try to run a HTTP server on port 8000 in a firejail sandbox, and make it accessible on all interfaces of the host on port 8888. The whole system can be represented as below: +----------------------...
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53 views

tap between two bridged physical interfaces

Is it possible to create a tap (or taps, if two are required?) between two physical interfaces so that all traffic (ethernet frames) between the two interfaces is passed through the application ...
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1answer
35 views

Creating a bridge network prevents the default network from getting an IP

I'm trying to set up a bridged network locally for KVM. I've tried to set it up with nmtui and manually creating a file. Both did not work. ifconfig shows enp3s0 as my Ethernet with the following ...
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492 views

forwarding ARP reply on bridge device

This is my network: [laptop A]~~~~[ddwrt1]~~~~[ddwrt2]----[desktop B] | +--[desktop C] The ddwrt2 is a wifi router running in client bridge mode connecting to another ...
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126 views

Using VLANs on linux dummy interfaces

I have an application that uses raw sockets to consume all packets from multiple linux (kernel 4.14) interfaces including wireless. In an attempt to keep extraneous scripting to a minimum, I'm trying ...
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Multiple links between bridges on different VLANs and STP

I've got two bridges with two pairs of virtual ethernet devices joining them to different VLANs. The setup looks something like this: Or in text form: $ brctl show bridge name bridge id STP ...
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No Carrier error when creating tap Interface for KVM Bridge

I have tried to create tap interface (tap210i0) manually for kvm. But each time the Tun device shows NO-CARRIER. I have interfaces eno1, eno2, vmbr0 and tap210i0. eno1 and eno2 are slaves for vmbr0. ...
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Bridge WLAN and LAN transparently

I have a range extender on one side of the house but it gives out really poor signal and looks to be slowly dying. I have a spare UniFi AP that I want to use but no Ethernet connection on that side ...
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28 views

Bridging a Wifi access point to a VPN connection

I have a computer running Debian that I would like to use as a wireless access point for sharing that computer's ethernet internet VPN connection. I can setup my openvpn based VPN software on my ...
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141 views

Bridge port VLAN tagging

I have two bridges configured. I'm trying to add a veth pair between them, configured so that untagged traffic on one bridge is carried on the other bridge with VLAN tag 5. So far I have this: $ ...
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1answer
493 views

Linux bridge for virtual machines not forwarding IP packets (but is forwarding ARP)

Kernel: 5.5.8-arch1-1 I am trying to get virtual networking working using a bridge attached to my physical interface. This is a typical setup, I'm not even trying to do anything weird. Bridge: br0 ...
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Passthrough of OpenVPN clients to local network

Ahoy friends. Unfortunately i don't have that much knowledge about OpenVPN but at least i want to try to get my idea working. Currently i'm using a VoIP device connected to my local area network, and ...

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