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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bridge-routing and martian packets

i am experimenting with routing a bit, and now i have a problem i cannot solve by myself eth0 | | ...
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35 views

Bridge 2 wifi connections

I have set up Ubuntu desktop on my laptop with an internal wifi card and an external USB WiFi dongle. Both WiFi interfaces work. I'd like to make one into an access point, and the other into the ...
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Unknown bridge gets recreated after reboot on Ubuntu 15.04@VMWare

I am running Ubuntu 15.04 on VMWare. For the last couple of days I have the issue that I have a "magic" network bridge: I never created this bridge and therefore I tried to delete it with the ...
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27 views

Packet flow in a virtual bridge with two interfaces, centos 7

I am struggling to create a bridge firewall with iptables since I cannot find/catch packets flowing through a bridge with two interfaces in centos7. No ip addresses are configured on interfaces or the ...
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41 views

How to use same interfaces settings for all wlan devices

I am working with a pcengines apu2c4 board with debian 8.4 installed.I am quite new to Linux. We use edimax ew-7811un usb wifi adapters. Obviously when you insert a wifi dongle new to the machine it ...
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28 views

Ubuntu Server in VMWare Fusion hangs on boot when using bridged networking

I am running Ubuntu Server 15.10 in VMWare Fusion Professional 8.1.0. All of my software is up to date. I need to configure the virtual machine to bridge to my Mac's network so that the client OS's ...
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21 views

Connect to guest vm (no wifi driver) from machines on same wireless network as the host machine?

I have my host os with proper wifi drivers that connects to my router. I run a NixOs VM (no wifi driver) as guest. I setup some configs in NixOS and it now has many binary caches that I want to share ...
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Is it possible to setup a bridge configuration where only the host can access a VM, but not the other way around and no VM->VM?

I have a KVM hypervisor set up with several VMs. A docker instance runs in each of them (for security purposes the containers shouldn't run on bare metal next to each other). Is it possible to ...
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29 views

Bridging two virtual machines on difference bridges

I have two VMs: vm1 & vm2. The host and VMs both are Ubuntu 14.04 LTS. Each VM "connects" to a bridge which connects to a virtual ethernet interface and end up at eth0 i.e. vm1 (192.168.0.23) ...
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39 views

qemu-system-arm problems adding second NIC/bridge

I am running Qemu under a host with two bridge interfaces and would simply like to bridge them to guest NICs. All of this works fine when bridging one NIC either by creating a bridge manually or using ...
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24 views

How to visualize bridge and port connections in Linux?

I have complex setup of Linux bridges, OVS bridges, veths pairs etc in a Debian host. Is there a tool that will produce a image of which is connected to what and which port's traffic is egressed ...
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35 views

Packets not moving through linux ethernet bridge

I am trying to set up a debian 8.3 machine with eth0 and eth1 bridged, but I can't get packets to traverse the bridge. Currently, eth0 is connected to a LAN with many other hosts, including a DHCP ...
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16 views

What are the consequences of adding a network interface to a bridge?

Context: I have a headless computer/server with 2 network interfaces (e.g. eth0, eth1) running CentOS 7. eth0 faces the world/Internet. A laptop is connected to eth1, and accessing the internet ...
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19 views

Bridge Linux Disconnecting Link Port

We have a problem with a Linux Bridge working as a Firewall. Sometimes one link is disconnected suddenly without explanation and we have port flapping for a long period of time. Logs from the machine ...
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61 views

How to bind an lxc container to a specific bridge?

I created a specific bridge br1 and would like to bind a specific container cont1 to that bridge. I have lxc and lxd installed, if that matters (I am not sure what the difference between them really ...
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1answer
42 views

KVM bridged interfaces not going up - inet, inet6 , bridge

I am setting up KVM host which will have multiple virtual machines visible from the outside with a similar /etc/network/interfaces config to this one # The loopback network interface auto lo iface ...
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20 views

KVM Networking Topology

I would like to set up a network on my Server where I run KVM as a hypervisor. The Network will be used for a distributed Jenkins setup. The goal topology is the following: One machine (Jenkins ...
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1answer
99 views

socat/netcat UDP to TCP

I am trying to bridge a connection between UDP and TCP. The UDP - must listen on port. The TCP - must connect to a server. The purpose of the connection is to control VLC player. I tried netcat and ...
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44 views

How bridge works on top of bond interface?

I am always confused in understanding network bonding and network bridging. Bridging is different and Bonding is different , I want to know how they work together. Thanks in advance.
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How to simulate a hub?

How can I simulate a hub on a Linux system? I know how to build bridge but I really need a hub behavior. My second solution is to use a bridge but I need to modify its behavior in order that it act as ...
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311 views

“Pipe” Wi-Fi signal through Ethernet cable

Currently the Ethernet ports in the building I work in are down, but the Wi-Fi works. I have a Wi-Fi-enabled laptop (Ubuntu 14.04 LTS (Trusty Tahr)) and a non-Wi-Fi enabled workstaion (Debian 8 ...
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35 views

How do I specify an alternative bridge interface (not br0) when using qemu-bridge-helper

By following the instructions found at http://wiki.qemu.org/Features/HelperNetworking I can configure qemu with qemu-bridge-helper, however, I can't figure out how to pass a bridging interface option ...
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46 views

How to make an iproute2 bridge setup permanent?

I've set up an archlinux inside a Oracle Virtual Box. To be able to reach the VM from the LAN I have added a bridge adapter and configured the guest system following the instructions from the Arch ...
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1answer
51 views

How to connect two VMs with different IP ranges to access each other?

Using KVM I have created four VMs, I have two public Ip addresses for my VMs, I know that I can assign these IPs to two of the VMs and connect them to internet by bridging my host's physical interface ...
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43 views

Setup a WLAN to LAN bridge (fedora 22)

I would like my computer to (sometimes) act like network bridge. Meaning, when connected to my wifi, I'd like to connect another client (or even switch) to my lan port. (DHCP and NAT enabled, only ...
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36 views

IP routing not working

I configured network bridge for my VM. VM can ping host but can't ping anything from internet. My configuration: # ip route default via 192.168.1.100 dev wlp3s0 192.168.1.0/24 dev wlp3s0 proto ...
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Alter DST port on bridged traffic

I need to rewrite the UDP destination port on traffic which is only bridged/L2, but I could not match this traffic via iptables. This traffic isn't going through NAT chains (it could be matched in ...
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251 views

How can I bridge two interfaces with ip/iproute2?

I know how to create a bridge using brctl, but I have been advised not to use this anymore, and to use iproute2 or ip instead(since brctl is deprecated presumably). Assuming this is good advice, how ...
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no arp entries for vnet

I have multiple kvm hypervisors (HV) which runs bunch of virtual machines (VM). Every HV has br0 and every VM is attached to it with its vnet interface. I noticed that one HV at arp -a shows me 2 ...
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41 views

Static ip for Virtualbox using bridge connection

I need to use the remoteapp on Ubuntu 14.04 using virtualbox running Win7. But the real problem is I can only access the remoteapp when connected to a wlan or eth using bridge network. Otherwise it ...
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1answer
52 views

Setup permanent bridge for dynamic network devices from lxc container?

TL:DR How can I make a bridge permanent (survive reboot) without adding a network device to the bridge config in /etc/network/interfaces? Hi, I just started playing around with lxc on ubuntu 14.04. ...
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1answer
85 views

Can't setup ssh connection with bridge

I would like to set up an ssh connection to a device, which is bridge. It's a device to put between router and PC and the traffic just goes through. I don't have a ip-adress assigned to the bridge, so ...
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37 views

Use a bond interface like a bridge

I was trying to set up a bridged interface in Micro Core Linux. There's no bridge available in the kernel.So now I would like to know if there's easy way to use a bond like a bridge?
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Bridged interfaces do not have internet access

I'm trying to run a QEMU VM but it doesn't have an internet access, only access to the host and a Docker network. What I did: Created a bridge with: brctl addbr virbr0; Turned it on: ip link set up ...
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Create a bridged interface like VirtualBox

When I createa a VirtualBox VM with Bridged Network (manually specifying which interface to bridge into) my VM gets IP address from the DHCP server in my LAN. How is this interface created? I want to ...
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Do I get the exact same tcpdump output if I use bond or bridge?

I need to get the tcpdump output. I was unable to set up a bridge but I could set up a bond. Does it matter which one I use when looking at the output of a tcpdump?
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Bridging two interfaces with iproute2 doesn't work

I'm trying to create a bridge between eth0 and eth1 with iproute2, but there's always the error: RTNETLINK answers: Operation not supported when I use the command:ip link add name br0 type bridge. ...
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136 views

Cannot ping VirtualBox VM using bridged network

I have a Fedora 22 laptop with a VirtualBox VM on it. All worked fine when I attached the VM to my wireless network card, but I want to attach it to my hardwired card because the wireless changes. But ...
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65 views

Implement network bridge as userspace program?

I am looking to do some packet filtering/address rewriting for packets which are coming from and going to a lxc container. After some basic research, I figured the best way to do this is to assign a ...
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1answer
665 views

Configure public IP addresses in KVM VMs

I have a physical server running CentOS 6.5 with one interface connected to the Internet (with one public IP address). Inside this server I have two VMs created with KVM through libvirt with one ...
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1answer
125 views

KVM - nat or bridge. How I do that

I have Debian Jessie server, and I have install apache server. From apache hosted several sites from different ip address. My server have resources for KVM. My question is - How I can set my free IP ...
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2answers
71 views

How to run a script at startup before networking is enabled?

I have a system that I use to test some programs doing non-IP networking protocols on various operating systems in virtual machines. The host is Fedora Linux. Because the networking is non-IP, the VMs ...
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Kali linux run airbase-ng along with wpa_supplicant

I have a notebook with installed kali linux with a built-in wireless card and I have also an external USB wireless adapter. I'm able to connect to networks with both of them, and I have no problems ...
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1answer
182 views

Share wlan connection to ethernet using command line

I have a wlan1 connection that I want to share to other computers on my LAN (via Ethernet - eth0). As this is somehow a temporary solution, I want this to be done by a script, so that I do not touch ...
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136 views

OpenWrt wifi bridge with IPv6

I am running OpenWrt 15.05 on my WDR4300. My ISP is via cable with legacy-IPv4-only. For IPv6 connectivity I use HE.net tunnel to receive a static IPv6 /64 subnet. My office is in a different room ...
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85 views

Errors with bridged interfaces

I have problem with Debian running as a VirtualBox Guest. I can set up a bridge but it flood the logs with a lot of errors and system becomes unusable. Errors such as: Nov 12 16:30:55 jessie-gnome ...
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26 views

Linux bridging question

I'm trying to understand why many Linux (virtual) networking guides attach IP addresses to a bridge device? A physical bridge itself doesn't really have an IP, instead one attaches networks to it and ...
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1answer
55 views

Connect from 3G dongle (eth1) to wlan0

I trying to make the following work on my Raspberry Pi (Running Linux): I have a 3G dongle connected that has a static IP adress and allows incomming traffic, it is presented as interface eth1. I also ...
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3answers
405 views

how do I build a bridge between two virtual machines?

I have used virt-install to create two CentOS 7 virtual machine guests on a CentOS 7 host computer. One virtual machine is called webvm, and hosts web sites on a private network. The other virtual ...
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77 views

How to bridge a wireless interface with another wireless interface (both on the same computer)?

Basically I am trying to accomplish the following setup - wireless internet ---> wlan0 of Ubuntu computer "bridged to" wlan1 of same Ubuntu computer ---> device with wifi The reason for this setup ...