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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Allow multicast packages from the bridge to wire in KVM

On a CentOS 6.5 host, I have a couple of guests - Ubuntu 12.04 and CentOS 6.5. The Ubuntu guest is generating mcast traffic that is visible via a tcpdump on the br3 interface. It is also visible on ...
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91 views

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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2answers
26 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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1answer
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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1answer
819 views

Configuring bridge network in kvm (debian wheezy 7.2)

I am desperately trying to run untangle 10 as a guest in kvm. My host system is debian 7.2 My problem is that I am unable to configure bridges/(virtual)NICS which are successfully identified by ...
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22 views

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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2answers
33 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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25 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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1answer
20 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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1answer
2k views

Bridge interfaces with Vlan on Linux based access point

I have a Linux based wireless access point. It has eth0 interface for ethernet, ath0 for wireless and br-wan as a bridge between the two. bridge name bridge id STP enabled ...
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1answer
2k views

Networking and Samba from a quest OS running on qemu

I'm trying to test some software on a big endian system to ensure compatibility. My plan is to use qemu on Ubuntu 12.04 to emulate a MIPS system. So far I've been able to create the quest system ...
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1answer
1k views

Arch Linux Ethernet to WiFi bridge

I want to use a Raspberry Pi running Arch Linux to extend my WiFi network. My situation is that I have a spare WiFi router that I want to use to expand my WiFi reception range as well as give me a few ...
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1answer
3k views

Bridge does not get IP via DHCP at boot

I'm running CentOS 7. I'm not running NetworkManager, and I've actually uninstalled it. My system is supposed to acquire an IPv4 address via DHCP on br0 at boot. Howver, when I log in, it has no ...
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2answers
2k views

br0 causes to drop multicast connection after 5 minutes

I have these interfaces set up on the router (Linux machine): br0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST> mtu 1500 inet 192.168.0.3 netmask 255.255.255.0 broadcast ...
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14 views

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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1answer
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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36 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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1answer
1k views

Fedora 18 guest in VirtualBox 4.2: How to assign static IPv4 address to guest regardless of active ethernet interface on host

I have a Ubuntu 13.04 host running VirtualBox 4.2.12. This host has both a wired and a wireless network interface, but only one of which would usually be active at any given time. For example, at home ...
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1answer
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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1answer
34 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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1answer
842 views

How to setup wireless AP with two wifi cards and ethernet as WAN on debian?

I'm trying to build wireless AP with 2 Atheros cards (AR5413 / AR5414 both), and one ethernet card to act as WAN. I am also having doubts if I should use ath5k or madwifi drivers. I've tried both ...
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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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1answer
40 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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1answer
366 views

LXC Bridge not working on ubuntu 15.04

I'm trying to get lxc containers running with a bridged network connection so the container get ip addresses like the host does from a dhcp server. I red several tutorials, but I couldn't find one ...
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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
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
92 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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1answer
43 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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25 views

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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1answer
2k views

tc on bridge port

I have a 4 port bridge: root@Linux-Switch:~# brctl show bridge name bridge id STP enabled interfaces br0 8000.000024cd2cb0 no eth0 eth1 ...
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“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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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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43 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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42 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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2k views

Cannot get IP address from WiFi access point (hostapd) with DHCP (dnsmasq) bridged with two ethernet adapters (bridge-utils)

My Android phone is trying to get DHCP address through WiFi connection, but fails. Obviously, I might have messed up something in my settings because I couldn't find a complete guide which would let ...
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6answers
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Cannot delete bridge - “bridge br0 is still up; can't delete it”

I have the same problem as this guy : Bring down and delete bridge interface that's up But that solution does not work for me. I remove all interfaces from the bridge using brctl delif . I then ...
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2answers
60k views

Bring down and delete bridge interface that's up

How do I remove a bridge that has an IP address that was brought up manually and isn't in /etc/network/interfaces? $ ifconfig br100 br100 Link ...
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2answers
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 ...
3
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1answer
237 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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0answers
26 views

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 ...
3
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1answer
51 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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2answers
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How to send data from serial port over wifi?

I have microcontroller device which reads data from sensors and sends it via Serial to USB converter (ftdi232 cable). This Serial to USB converter is connected to ARMv7 mini-computer - CuBox with ...
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2answers
4k views

How to find MAC or IP address of a device connected to the same Ethernet bridge?

I have the following topology: DeviceX ------ | DeviceX bridge with two Ethernet cards (created with bridge-utils) ---------------- router | ...
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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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1answer
36 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?