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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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ebtable rule to disable packet(other than BPDU) flood/forward on bridge device

The configuration has one bridge device and two ports attached to it. The requirement is to disable flooding or forwarding of any packet from bridge device to other associated ports. How to achieve ...
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33 views

How to route between two bridge interfaces?

So I have a total of two bridges. One has the 10.0.0.1/24 subnet (br0), and the other has the 10.1.0.1/8 subnet (br1). I want to setup an NGINX reverse proxy that would run on a container connected ...
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Security implications of using either veth-NAT vs. veth-Bridge for network namespaces(linux)?

My goal is to use linux namespaces for sandboxing/isolation. I run for instance a debootstrap / pacstraped image using systemd-nspawn, LXC or docker... While I am reasonably aware of most namespaces ...
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67 views

Enable conection bridge in centOS 6.1

It used a vm with centos 6 in bridge, without any problem. But today, when starting vm, it is stated that there is no connectivity to the network. I have the following error message: 'Bonding, ...
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1answer
51 views

Accessing internet hosts from qemu guests behind a bridged network

I am trying to set up a number of qemu quests on the same private network. I want them to not be accessible outside the host but they should be able to access each other and resources from the ...
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27 views

How do I make public on the physical network a local virtual bridge

I'm using Ubuntu (Bionic, 18.04) both on remote servers and on my laptop. In wide scope, I am trying to provide direct network access to VM, currently it works via NAT (with port forwarding). libvirt ...
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38 views

Isolating bridge interfaces from interfaces not connected to them

I am trying to build an emulation platform for emulating an LTE connection using ns-3 and tap interfaces inside a single real host. I have found this very complicated. I want to be able to create a ...
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1answer
36 views

Network Bridge for VM not working after reboot

I have a CentOS 7 host with a network bridge set up for guest VM's to use. All was well until a recent reboot. After the reboot, the guest VM does not have internet access, nor can it ping other local ...
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38 views

Trouble setting up Raspbian network bridge

I'm trying to set up a raspberry pi as a network bridge between a wireless access point and a router (the reason for this being that I'd like to connect a device to the AP and use tc on the pi to ...
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69 views

Linux bridge stops working after adding 2nd interface

I am trying to bridge two interfaces in a linux VM on a Mac but adding the second interface to the bridge breaks everything. I'm hoping to get some guidance on what I'm doing wrong. Setup: Network --...
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61 views

Linux Bridge br0 - Routing multicast data

I have a bridge interface br0 that uses to two physical interfaces: eth0 and eth1. These are connected to a switch that receives multicast data on 4 different multicast address (234.1.2.0/1/2/3) from ...
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41 views

what nmcli command shows interfaces belonging to bridge

I've created bridge br0 and added interfaces eth0 and eth1 to this bridge nmcli con add ifname br0 type bridge con-name br0 nmcli con add type bridge-slave ifname eth0 master br0 nmcli con add type ...
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25 views

vagrant network bridge using public static ip

I am using vagrant 2.2.3 version and I want to configure bridge network using static ip address. My code is: Vagrant.configure("2") do |config| config.vm.network "public_network", auto_config: ...
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126 views

How does iptable work with linux bridge?

Setup: VM1 --- Bridge -- VM2 VM1 and 2 are on same subnet. Bridge has 2 interfaces added to brctl bridge. When I block VM2 ip using uptables -A FORWARD -s (VM1 ip) -j DENY it doesn't work. I ...
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50 views

Add interface that is up to a bridge

I'm trying to compose /etc/network/interfaces that would combine two ethernet interfaces in a brdige. The problem is that the system boots using PXE loader and NFS root, and one of the interfaces ...
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1answer
19 views

OpenVPN does not work with Gateway, but does with bridge

i want use openvpn on Linux Mint. When i tries the VPN connection (i am client) i writes these commands : sudo openvpn --config file.tcp.ovpn then my authorization Enter Auth Username: user_xy ...
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1answer
128 views

Bridge network stop working with kvm/qemu

2-3 months ago I followed this article https://brooks.sh/2017/12/22/configuring-kvm-on-clear-linux/ to setup bridge network for kvm/qemu guest ubuntu. My Host os is ClearLinux. However the guest OS ...
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1answer
46 views

How to make docker.service wait for cni0.netdev bridge during systemd boot?

I'm running Ubuntu 18.04.1 LTS I have created a cni0.netdev and cni0.network file in /etc/systemd/network to create a virtual bridge to use for a local Kubernetes cluster/node. I have enabled ...
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connect LKVM vms over bridge

I'm using lightweight VM lkvm which creates tun interfaces on the host. Now I want to connect two instances of lkvm over bridge interface, similar to what other VMs do: VM1 ...
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1answer
183 views

Xen on Ubuntu 18.04 with IPv4 (NAT) and IPv6

I'm renting a dedicated server at Hetzner and installed Ubuntu server 18.04 LTS on it. I've got two public IPv4 addresses named x.x.x.x and y.y.y.y and one IPv6 /64 block for connecting my private ...
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46 views

OpenVPN bridge gateway stops all traffic

I am not sure if this is a linux or windows issue. I have openvpn set up with a bridge interface that includes tap0 and eth0. I have my client machine (win10) getting its IP through my dhcp server. ...
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How to filter domains on a transparent network bridge?

How can you filter traffic on a transparent network bridge? With iptables it is possible to some extend but most of the time a proxy is recommended or alternatively something like pi-hole or dnsmasq ...
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124 views

Linux bridge SNAT with ebtables

I was reading the following code (dot1x bridge bypass): https://github.com/mubix/8021xbridge/blob/master/scripts/trans_bridge.prepop A quick description, we have 2 interfaces, the first is connected ...
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1answer
56 views

No ethernet ip address in my vocore2

I just flashed my vocore2u with openwrt 18.06.1, and plug it with an ethernet cable to access network while setting up wireless access-point for my phone. The AP is working and connected to the ...
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OpenVPN bridging a bridged adapter

I'm running OpenVPN on a virtual server. The virtual server has a bridged adapted from the single physical host adapter. Can I bridge this bridged adapter so VPN clients can get bridged network access?...
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1answer
84 views

Not able to ssh from VM to VM via linux bridge

I want to able to ssh from VM1 to VM2, both VM are connected to a Linux bridge(br0). Below is my topology VM1(m1)<====SSH====>[br0]<======SSH=====>VM2(m2) 1 Created bridge br0 $ sudo ...
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3answers
194 views

connect LAN device to WLAN, using a raspberry pi

I have an oscilloscope that I want to access from my laptop. The scope only has a LAN connection, and my laptop is connected to my wifi. I can't connect the scope to my wifi router because I want the ...
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87 views

What are “self” and “master” options for in “bridge vlan add”?

I'm reading "man bridge" and it says something like: bridge vlan { add | del } dev DEV vid VID [ pvid ] [ untagged ] [ self ] [ master ] What are "self" and "master" options for? man says: self ...
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1answer
185 views

qemu share network

I have a qemu machine that i connect to the network using a bride virtual network but since I am using a bridge interface the host can't connect to the internet and the lan. is there any way to have ...
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61 views

debian 9 dns lookup does not work after creating bridge [closed]

Debian 9 has been installed and a also bridge device like described in https://wiki.debian.org/BridgeNetworkConnections It is reproducable that the DNS lookup does not work anymore after creating the ...
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difference between port forwarding and a virtual network bridge

I have two network interfaces eth0 Link encap:Ethernet HWaddr 00:04:35:00:01:21 inet addr:172.24.176.221 Bcast:172.24.255.255 Mask:255.255.0.0 inet6 addr: fe80::204:35ff:...
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1answer
108 views

Shutting down interfaces takes a very long time

I have ran into a most annoying problem when rebooting/ shutting down. For some odd reason the shutdown always takes the "maximum" amount of time. I have been able to trace the cause to be ...
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67 views

How to enable networking for xen guest

I have a really weird one. The setup is an ubuntu 16.04 host, with xen installed. I'm using virt-manager on my mac to manage the machines. I've added a bridged network then I attempted to add a ...
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1answer
253 views

Using VirtualBMC with VMs

I need to use one VM (master) to manage power status of another VM (slave) on the same host by ipmitool. I have installed VirtualBMC on the host machine, added the slave VM and started its BMC: $ ...
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2answers
656 views

How to connect 2 virtual bridges so traffic goes from one to the other?

Debian system, current situation, configured via etc/network/interfaces bridge "br0" has 2 physical ethernet interfaces eth0 (WAN side, connected to ISP modem/router) eth1 (LAN side going to a ...
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1answer
45 views

Bridge network interfering with some Intranet domains

I have some bridge networks which I don't know where they come from: $ ifconfig | grep -o "^br-\w*" br-4e3069271b9c br-919ad27f74b2 br-e448c7cbb558 br-e6840866c3b6 br-636926a06053 (I suspect either ...
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66 views

QEMU Deb9 guest graphical install fails to get DHCP reply during install

My goal is to setup a few QEMU/libvirt based guests using a bridge interface on the host so each guest-VM has a DHCP assigned IP address on my LAN network. I have successfully setup and used less ...
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21 views

Problem when bridging virtual machines

I'm trying to bridge 3 Linux VMs (one working as openvswitch) in the same host, and then make an identical configuration on other host, to connect the most external VMs, something like this: VMext1 ...
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1answer
411 views

QEMU - network bridge

I'm setting up a VM on Debian 9 using QEMU (and KVM). I'm currently trying to make it work through a bridged network, which I have set up using ip link, ip tuntap etc; here is the output of brctl show:...
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1answer
887 views

difference betweeen passthrough NIC and bridge setup in qemu

I set up a quemu virtual machine using virsh in a way that I pass through my physical USB NIC connected to the host machine directly to the virtual machine. This means that I see my USB NIC in the ...
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1answer
1k views

dhcpd and bridge - No subnet declaration error

I prepared dhcpd configuration in Debian 8 and it successfully worked but then I added bridge and dhcpd failed. bridge: root@remote:/home/s# brctl show bridge name bridge id STP enabled ...
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1answer
77 views

Starting iptables stops communication between two virtual machines connected by a bridge

I created a bridge named eth2 with the interface gre1 between 2 virtual machines VM1 and VM2. The following is VM1 with bridge device eth2. # brctl show bridge name bridge id STP ...
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1answer
71 views

Separate two network bridges on linux

I am currently trying to setup a router for my homenetwork using linux (Archlinux to be more specific). The embedded board i am using has 3 lan interfaces, called wan0, lan0, lan1 and two wifi cards, ...
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2answers
2k views

Transparent Bridge from Existing WiFi to Ethernet?

I've seen lots of examples that turn the bridging machine into another router with its own DHCP server, etc. But I want to use a wired device as if it were connected directly to the original router. ...
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272 views

How many mac addresses for a bridge?

I have a bridge set up on a Ubuntu box using two ethernet devices. It seems to work, but I am trying to understand some network traffic, and why these show up in my dhcp client list (/var/lib/dhcp/ is ...
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157 views

How can I create ethernet bridge in Linux system in Buildroot?

I have 2 (and will have additional 2) ethernet interfaces in my device, and I want them to be bridged. I use Buildroot for building my system. I want to create bridge at startup. Currently I use this /...
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2answers
329 views

How do I force packet go through specific physical interface knowing destination MAC only?

I'm creating a L3-Switch that modifies packets by redirecting some of them to local app. My goal is to send them further to the same MAC as before. Short "why": zero-conf device to connect with to ...
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114 views

connect to two separate LANs with a single interface

I have a group of computers that I wish to connect to two LANs, which I want to otherwise keep separate. Each computer only has one ethernet port; currently I am connecting to LAN1 via wifi with DHCP ...
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1answer
60 views

Why can't we easily bridge over a wireless NIC

In the documentation of Debian it is written that: Just like you can bridge two wired ethernet interfaces, you can bridge between an ethernet interface and a wireless interface. However, most ...
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1answer
444 views

How to make virtual devices on GNS3 be able to ping the physical host [closed]

Disclaimer: this is a duplicate question, I asked this question and then that question on another community, but I'm still not clear how to solve my problem. I just don't get it, so here I am asking a ...