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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Ubuntu + bridge +qemu + tap + virtio dropping packets

I've got what I think is the standard qemu bridge/ubuntu tap interfaces set up running variety of VMs on my Ubuntu host. All the VMs I'm having trouble with are Windows images. I have researched this ...
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ARP cache getting null mac over a bridge

I have an interface eno1 and a bridge br0 $ ifconfig br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.250.53 netmask 255.255.255.0 broadcast 192.168.250.255 ...
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tap interfaces always disabled in linux bridge

I have a physical interface eth0, and I want to create two virtual interfaces and bridge them with eth0. For this purpose I do: #Create the virtual interfaces tunctl -t tap0 tunctl -t tap1 ifconfig ...
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31 views

Intermitent connection issues inside LXC

I am experiencing connection issues inside a LXC that are driving me mad. They are intermitent. They appear during some time, and they suddenly disapear. Scenario A lxc inside a host. Both are ...
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9 views

Setting up bridge for domU to be accessed from external network(internet)

I am trying to setup virtual guests(PV) using xen 4.4 (xen-tools) on debian 8.3. Problem is that I fail to configure bridge properly I guess ^^. I have setup an interface xenbr0 that uses same IP ad ...
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19 views

CentOS7 Network Bridge Fails on boot until cable unplugged and plugged back in

I have a problem with a brand new CentOS 7 server I am trying to set-up. I have set-up a network bridge as per instructions on the redhat documentation website and it all works great until I reboot. ...
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Use ubuntu 14.04.3 box as a wireless access point, no dhcp server and eth0 to wlan0 bridging [migrated]

I noticed that I had a 300Mbps N wireless adapter laying arround so I decided to use it in my ubuntu server to expand the range of my local nework, that server is being used as a samba and ftp server, ...
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11 views

OpenVPN TAP interface security

Background: I am very naive about how bridging works. I wanted to know bridging interfaces exposes devices on both ends of the bridge to communicate? Question: How secure is the openvpn tap ...
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Possible for linux bridge to intercept traffic?

I have a linux machine setup as a bridge between a client and a server; brctl addbr0 brctl addif br0 eth1 brctl addif br0 eth2 ifconfig eth1 0.0.0.0 ifconfig eth2 0.0.0.0 ip link set br0 up I also ...
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Bridged qemu machine cannot receive packets, these are dropped [migrated]

I've created virtual machine (ppc) with bridged interface (using bridge helper) on archlinux. Machine can send packet out, but cannot receive anything. I can see packets (dhcp discover,request and/or ...
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17 views

How to configure netflow on linux bridges(“docker0” Bridge)

I have Openstack setup which one of the compute node has docker and if I want to monitor the traffic, how to configure netflow on "docker0" bridge/Linux Bridge. I can see the bridge name and ID with ...
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Xen Vif creation xl vs xm

Hi everyone, I switch my server from a xend/xm Xen install to a 4.1 xl Xen install. Therefore Xen does not create vif network interface when I launch xl create /etc/xen/my_server.cfg but does create ...
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Routing from docker containers using a different physical network interface and default gateway

Background Information I have a server with two network interfaces that is running Docker. Docker, like some virtualization tools, creates a Linux bridge interface called docker0. This interface is ...
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17 views

Setting up MTU on a bridge between wired and wireless interface

I'm trying to configure jumbo frames on a MikroTik router (RB2011). My setup is following: 5 ethernet ports, max. L2 MTU = 4074 one 802.11 (Wi-Fi) access point, max. L2 MTU = 1600 a bridge between ...
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Guest networking not working on Debian Jessie Host server KVM with br0 bridged network

GUESTS networking not working at all. In other words guest can not ping host or lan gateway. I have br0 bridge already created, also brctl show that vnet0 was properly added by KVM to br0 on guest ...
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60 views

Packets in bridge get up to the user space without being redirected there

I set up a bridge interface (br0) on PC-A (Linux Ubunutu 14.04) In addition I created an application with a TCP Listener on port 80 in the user-space on PC-A As what I understood from the ...
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53 views

OpenVPN Access Server Site-to-Site Layer 2 Bridging. DHCP Issues

First of all sorry, my english is a bit sucky or broken at parts. I'm having a little issue with OpenVPN S2S Layer-2 Bridging and DHCP over the bridge. First of all, all clients no matter on which ...
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727 views

docker0 bridge status toggles between enabled/disabled, what could be causing that?

I have some CoreOS bare metal instances that are displaying unusual behaviour on the docker0 bridge device. On one of the instances where this has been occurring, I'm running couchbase server and it ...
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Linux: NAT from lan to a bridge results in erroneous nat between bridge components. How to fix?

Consider a machine with 3 NIC's. Two bridges are active; from eth1 to a vlan on eth0 and from eth3 to another vlan on eth0. Interfaces: auto lo iface lo inet loopback auto eth0 allow-hotplug eth0 ...
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how to associate a Docker network interface to a Linux network interface (eth5) on Linux host?

My Linux host has 8 Ethernet interfaces, eth0 - eth7. I'm running three Docker 1.9 containers on this Linux host. How can I associate a network interface inside one Docker container to a specific ...
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Xen networking - dom0 receives ARP requests but no reachability

Both dom0 and domU are Debian 8. Dom0 network configuration is: auto xenbr0 iface xenbr0 inet manual bridge_ports eth1 bridge_stp off bridge_waitport 0 bridge_fd 0 auto xenbr0.4 ...
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33 views

Not able to ping ips created inside docker container using namespace in centos7

I have a docker container running inside centOS7. Now docker creates a bridge by default named as docker0 in host system. Inside the docker container, we have created another bridge named as eth2 ...
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tcpdump on bridge interface (virbr) does not receive any packets destined for one of its addresses

Here's the configuration for the interface: # ifconfig virbr0 virbr0: flags=4355 mtu 1500 inet 192.168.11.1 netmask 255.255.255.255 broadcast 255.255.255.255 ether ...
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Bridged network tap unable to communicate with client

User has a workstation on OSX that needs to be able to test a variety of VoIP devices by reading all packets sent and received by the test device. Workstation has two ethernet adapters running on a ...
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Routing Traffic Through from VPN Client to Switch Network

Network Diagram I have two computers, Foo and Bar, connected to an OpenVPN server on Amazon EC2. Both the computers are connected to the Internet via Wi-Fi. The VPN IP addresses are on 13.8.0.*. ...
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52 views

KVM guest cannot connect to host, but works vice versa

I have debian 7 on my host machine and I run a KVM vm on it. My hosts network configuration is this (the relevant parts): br0 Link encap:Ethernet HWaddr 68:b5:99:ae:8f:11 inet ...
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29 views

KVM Guest in vlan + bridge not working

I'm trying to set up a few KVM Guest on a machine with bridged interfaces and vlans. The whole configuration is done in a host with Debian, to be more specific in Kali 2.0 and it has DHCP. Im doing ...
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Dell Switches and Spanning-Tree Route ID Configuration

I am analyzing a network for a colleague. It's a fairly simple topology and all the switches have converged on a common root-bridge, however two of the non-root bridges have identified the root as the ...
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4k views

LXC Container Networking

I just started to experiment with LXC containers. I was able to create a container and start it up but I cannot get dhcp to assign the container an IP address. If I assign a static address the ...
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32 views

OpenVPN bridged mode, cant access private network

I am struggling with this problem and I just can't figure it out. I am using cloud servers and I got a private network from them with ip's 10.99.x.x and netmask 255.255.0.0 I have 2 servers: ...
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Trying to create one ip subnet in two vlans bridged

The question is am i missing something while creating the bridge between two parts of the same ip subnet? What I am trying to do is to limit local services(by firewall) available to one of ssid's of ...
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2answers
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Running two Ubuntu KVM virtual machines with bridged (tapped?) networking

I have a server that's running Ubuntu 14.04, and I'm trying to run two virtual machines with bridged networking at the same time. The networking of the first VM works, but the second one has no ...
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67 views

How can I connect my switch to my fibre connection?

Question We just got our ADSL line replaced with a Fibre optic line. Part of the Fibre-install included a Fibre panel (terminator?) and a Huawei switch. I'm not sure how to connect our existing ...
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KVM/libvirt: Guest monopolizes bridge

I'm having a problem in which the first guest started on a VM host can send traffic through both of its assigned interfaces, but subsequent guests can only send traffic through one interface. My VM ...
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28 views

Multiple IP's on the same bridge

I'm setting up a Ubuntu host machine for a couple of kvm virtual machines. Here is my interface config file: # config block 0 auto lo vmbr0 iface lo inet loopback iface vmbr0 inet static address ...
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31 views

Does the name eth0 matter?

I'm running Debian as the host and have a bridge for the kvm virtual machines. The bridge setup looks something like this: auto vmbr0 iface vmbr0 inet static address 192.168.0.100 netmask ...
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94 views

how to bring up network-interfaces and bridges in specific order at boot time

Currently, my setup is having many nodes, each having RHEL 7 installed, with each node having only one single interface. I am using ovs-bridge and a vlan-tagged interface within the host. I use ...
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2answers
30 views

Debian KVM network setup

I have a server with 4 ethernet ports. I want to use two ports for link aggregation to be used for KVM (virtual guests). How can I go about setting this up properly? Create the link agg first then ...
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2answers
110 views

Debian Linux routing additional IP to LXC

I'm trying to route an additional IP of my server from Hetzner to a LXC instance (on Debian Jessie). I've found this guide ...
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57 views

Adding multiple vlan interfaces into bridge (ovs)

I am adding multiple vlan interfaces (eth3.409, eth3.410, ...) to a bridge, furthermore I also add the eth2 interface (local network) to the bridge. eth3 is a trunk with 13 different vlans. The ...
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1answer
131 views

How to create bridged network interface for Xen?

I'm trying to use Xen on an Ubuntu server for the first time and have a really basic question. I'm following the guide in the Ubuntu docs and under the Network Configuration->Using bridge-utils ...
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1answer
195 views

CentOS, KVM, VLANs and bridging

I need help designing networking for virtualized guests using KVM. My machine is running CentOS 7 and has 2 NICs. I'd like to achieve the following One physical interface (em1) shall be used for ...
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27 views

Create 3 virtual interfaces that can ping6 each other

In Linux, how can you create 3 virtual interfaces that are bridged together through a virtual switch so that they can ping6 each other? What I did: tunctl -t tap1i tunctl -t tap2i tunctl -t tap3i ip ...
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2answers
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wget only works when tcpdump is listening

I am running two Virtual Machines over the XEN hypervisor both with Ubuntu trusty (Linaro-Developer version) with the following simple bridge networking setup: Backend domain (dom0): br0 ...
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VPN with VMware Player [closed]

I have 2 domains, prod and dev. Dev has a 1 way trust from prod (dev trusts prod, but prod does not trust dev). My host computer (laptop, win7 sp1) is a member of the prod domain and can VPN in for ...
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213 views

Ipv6 over bridged network stops working after some time (Ubuntu LXC)

i hope you can help me. I am running several Linux Containers on a bare metal server which is provided with an Global Ipv6 address as well as an 64-bit network by my provider. I have configured IPv6 ...
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1answer
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NIC bonding over bridged GRE-TAP: not getting replies… unless I run “tcpdump”?

I'm trying to get Linux bonding working over a VPN (GRE-TAP). The funny thing is, that it only works when I have tcpdump running on both hosts, but more on that later... There are two machines, ...
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1answer
26 views

L2 Bridging two Locations

I'm not really experienced in Advanced Networking topics, so any help would be much appreciated. We have to temporarily bridge the Network (multiple VLANs) of two Buildings over the Internet for two ...
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1answer
15 views

Bridge Mode with fail open

I have a GNU/Linux server running an HTTP reverse proxy (Nginx). The upstream server is well-know (IP address on a subnet). What I would like to "guarantee" is that in case reverse proxy goes down, ...
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42 views

Xen bridge - block traffic from port range - iptables / ebtables

I use Xen with bridge interface : - eth0 - viifbr0 - Name of VM interface : vifv10XX.0 Do you know if it is possible to block output traffic from source port range for a domU please ? If yes, can ...