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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KVM/Libvirt bridged/routed networking not working on newer guest kernels

I have a dedicated server running Debian 6, with Libvirt (0.9.11.3) and Qemu-KVM (qemu-kvm-1.0+dfsg-11, Debian). I am having a problem getting bridged/routed networking to work in KVM guests with ...
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need advice on data center move, communication with both facilities during transition

We are beginning the process of moving to a new facility. Office and warehouse operations will both be moving, and we must get shipping operations up and running at the new location while continuing ...
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2answers
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Bridging Network Devices with Multiple IPs

I have a small server with a single NIC that I am trying to get a bridge functioning on so that I can run KVM. On this NIC I have a couple IPs statically assigned to it: eth0 = 192.168.1.1 eth0:1 = ...
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Azure Site-to-Site VPN with a Linux based router to bridge the VPN ports to a RRAS server while keeping NAT for other traffic

I am trying to get an Azure Site-to-Site VPN up and running using RRAS but require help configuring my router's iptables to bridge the VPN ports and protocols to the RRAS server without using NAT ...
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2answers
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FreeBSD 9.1; bridge0 and default gateway issue

I've got a FreeBSD 9.1-RELEASE-p1 system with three nics, I'm using: igb0, sfxge1 and sfxge2. igb0 used for internet access and is default gateway. Other two nics, I need to use to create bridge0. ...
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1answer
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Multiple, different VLAN trunks to KVM guests (Linux)

I've hit a roadblock of sorts with an architectural challenge. I've got a server running KVM - which will feature a number of guests, some running virtualised firewalls and others, just plain web ...
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1answer
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Bridge and OpenVPN with shorewall

I have this scenario and everything it's working OK, but I want to configure my Shorewall and I can't do it. My interfaces are: br0 (bridge of eth0) tun0 (OpenVPN) vnet* (each one of bridged ...
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1answer
407 views

OpenStack “quantum” network manager and existing bridge/VLAN devices

The Quantum network manager included with recent versions of OpenStack does not support the --bridge and --bridge-interface arguments to the nova-list network create command. Short of writing a new ...
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2answers
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Linux bridge responding to arp on wrong interface?

I'm trying to build a silent bridge for monitoring purpose. My computer is running linux 2.6, brctl 1.4 and has 3 NIC: eth0, with an assigned IP, used for SSH maintenance eth1, and eth2 , the 2 ...
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1answer
71 views

ganeti network: change bridge name

I try to add an instance to network, first first I need to connect the network to a bridge. I'm using bridge vbr0 instead of standard xen-br0, gnt-cluster info shows that ganeti has the default set ...
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VMware two vSwitches Guests can't communicate between them

I have some servers in this configuration: (complete configuration) And I am not able, from VMGuest1, to ping either VMGuest3 or VMGuest4. I can, however, ping Host1 and Host2, which are attached ...
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305 views

Server ethernet bridging, fail-safe [closed]

Is there server hardware available with two ethernet ports, that can turn into a fail-safe bridge when offline? My use example is a server that does filtering and traffic monitoring on an ethernet ...
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2answers
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NATing IPv4 while routing IPv6

I've the following setup: client(s) <---> (eth0) router (eth1) <---> wan I have a static IPv4 address and a /48 IPv6 address block. I need to connect all the clients to (wan). Each ...
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2answers
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Random temporary network freeze on kvm guest machines

I'm running two guest machines under KVM. The host is running Arch Linux (kernel version 2.6.38.2), the guests are both CentOS 5.5 (kernel version 2.6.18). I have the networking set up as a bridge, ...
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1answer
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kvm Bridge issue - no network to guest

I currently have a Proxmox (debian) KVM host running multiple OpenVZ Containers for general usage, I am looking at creating a KVM VM however I'm unable to get networking to work for the CentOS KVM ...
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1answer
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pfSense with a bridge as a LAN interface : traffic blocked between interfaces

I have a pfSense 2.0-BETA3 box as a home router. The box has 3 wired ETH ports and a wireless interface. It is configured as follow : WAN : vr0 LAN : BRIDGE0 OPT1 : vr1 OPT2 : vr2 OPT3 : ath0 (...
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Linux Ethernet/wireless bridging

One of our new requirements for a product I work on is to support Ethernet-to-wireless bridging. Suppose we have two network interfaces: eth0 and ath0 (we're using the Madwifi driver). What sort of ...
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Instabilities with Bridged and bonded interfaces

I did post yesterday to get a working setup with several bridged interfaces used for virtual machines (KVM/libvirt). One of the bridged interface is just using eth3 as its ports while the second ...
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494 views

libvirtd kvm networking on Centos5.4

I've got KVM installed on CentOS 5.4, and am attempting to set up a virtual network to allow each VM to communicate with services on the host, namely DHCP to allow PXE boot installations. I'm having ...
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2answers
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Assign ipv6 address to KVM guests on bridge mode

System: CentOS 6.5 Network: Bridge on br0 IPv6: ISP Native /64 block. IPv4: ISP address (not internal LAN) Purpose: To assign IPv6 only to guests (manually), I don't want ipv4 address to be ...
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678 views

Assign public and private IP addresses for a KVM guest

I would like to create a KVM guest with two different IPs, like one public IP and another private IP for the same KVM guest. My host is 210.x.x.x. Series and Guest are also configured with the 220.x....
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Can I set up two NICs bridged together and still SSH into the bridging machine?

I have a ubuntu box setup with two NICs. I can bridge them together just fine, but I haven't been able to setup a way to SSH into the box once the connections are bridged together. Here's my /etc/...
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IGMP V3 support in Linux-2.6.35

I am trying to start a bridge connection and force it to use IGMPV3. The following command will explain my issue better : The below is the output of force_igmp_version before issuing brctl commands ...
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Configure Cisco 877 as bridge between Internet and Cisco ASA 5505

ISP ADSL ---- Cisco 877 Router ---- Cisco ASA 5505 I have the above connection. I'd like to avoid using NAT on the Cisco 837 router, and just put the ASA directly on the Internet. However, I have ...
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No IPv4 address assigned to KVM VM

I'm having trouble setting up KVM w. bridged networking in Ubuntu 10.10. I'm starting my VM through virsh, after this I can see the kvm process and vnet device on the host machine, but the new ...
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KVM work with bridge network problems

I try to configure bridge network for KVM(refer to http://www.linux-kvm.org/page/Networking), and it worked for Guest OS, but I have two problems with my Fedora host OS: 1、I can not access internet ...
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1answer
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KVM network bridge with public static IP for both host and guests

I have a Ubuntu 10.04 server with 2 public static addresses. There is a KVM guest (also Ubuntu) installed and running. What i want is to give the guest an IP of the host, so that both machines have ...
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385 views

Filter mirrored port traffic using iptables

I receive traffic from a mirrored port and I would like to send it into an NFQUEUE for processing. Because of the mirrored port, the packets destination MAC addresses are not my host MAC address. ...
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2answers
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How to assign multiple public IP address for 3 KVM guest using a single NIC [closed]

i've a CentOS 6.5 KVM Host with 3 KVM-Guest CentOS 6.5. Now I want to assign a public IP for the host and one public IP for each guest using a single network interface. My IPs (assigned by network ...
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1answer
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eth0 on lxc does not work

I am facing some problems that the eth0 on lxc container does not work. I already tried Bridging LXC containers to host eth0 so they can have a public IP, but it does not help. On my host (Ubuntu on ...
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Create a bridged network connection using only the command line

I want to bridge two network connections on a Microsoft Hyper-V Server 2008 R2. As I'm essentially using a "Server Core", GUI is not available, so I can't use the usual way. (Right click the network ...
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Ubuntu 12.04 - Issue with routing between ethernet and bond/bridge

I have a device which has 3 Ethernet devices and one WiFi-device on board. I'm using eth0 for an internal network (192.168.1.0/24) and eth1, eth2 and wlan0 to connect to an external network (192.168.0....
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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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Add a second bridge to a virtual machine

We have a ubuntu-12.04 host running another ubuntu-12.04 virtual machine with kvm virtualization and bridged network interface on eth4. This network allows the virtual machine access to the outside ...
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1answer
996 views

Xen VM won't come up: could not find bridge device xenbr0 (configured to use routed)

I am using xen 4.4.1 on an Ubuntu 14.04 server, my DomU is running Ubuntu 14.04 Server as well. I've run this DomU in bridge-mode previously no problems. However I want to switch to a routed setup. I ...
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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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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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2answers
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Disable IP on bridge

OK, I'm running libvirt on my server, I have only one interface. In order to use the public IP in my VM I need to set up a bridge, everything OK so far.. But I don't want to setup an IP address on the ...
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2answers
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KVM bridge trouble in Ubuntu (server 9.04)

I make virtual environment with Ubuntu+KVM. It is the following constitution, but it is lent IP (192.168.1.2) ubuntu02 by DHCPD, and the same IP seems to be lent to ubuntu03 router/dhcpd - ...
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1answer
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Why are eth0 and vmbr0 (bridge) having the same MAC addresses?

I configured my Debian (with KVM on board) as following: /etc/network/interfaces: auto lo iface lo inet loopback auto eth0 iface eth0 inet manual auto vmbr0 iface vmbr0 inet static address 176....
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2answers
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When I restart my LXC environment, the container does not re-bind to the IP address

The IP does no longer respond to a remote ping With restart I mean: lxc-stop -n vm3 lxc-start -n vm3 -f /etc/lxc/vm3.conf -d -- /etc/network/interfaces auto lo iface lo inet loopback up route ...
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1answer
2k views

Questions about bridging VLANs

If, across the same building, I have two physically separate networks to connect devices together via simple switches, my understanding is that I could save myself some hardware-complexity if I were ...
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584 views

Proper way to expose VirtualBox' machine to network via “one MAC” security locked switch port

Say, we need to expose LXC container (LXC) or Virtualbox VM (VBM) to public network with its own IP-adress (within additionaly assigned network — ADD-net) which is to be routed through main host. When ...
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1answer
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DHCP not working through long bridged network

I have setup a hotspot at my local harbor. I have encountered a problem with my setup. The accespoint that creates the hotspot connection is a out door long range antenna from UBNT. The distance from ...
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Same or separate subnets when connecting two buildings via a wireless bridge

We have two buildings about 200 feet apart connected via SMC's outdoor wireless bridge. Currently, both buildings are on the same subnet with one DHCP server in the main building. This seemed to be ...
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2answers
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Linux Routing with two NICs (LAN vs Internet) with NAT and bridging for VMs

My Setup: There is only one physical machine in this setup, a Host System for Virtual Machines (VMs) with two network adapters. One NIC (eth0) is connected to an internal network (LAN subnet, e.g. ...
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1answer
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KVM second private network (bridged), how to get working?

this seems to be a hard problem. I would therefore be very thankfull for your advice. I spend two days trying to get this running, but with no success. (The Public IP Stuff is working, but not the ...
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3answers
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Debian network bridge configuration - /etc/network/interfaces

I'm running a Lenny Xen dom0 hosting multiple virtual machines in a routed IP setup. To get an additional private subnet, I created the bridge xenbr0 in the dom0 with the following commands: brctl ...
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xen creating a new virtual machine with bridge networking

I am using CentOS 6.5 64 use this tutorial to setup Bridge [root@CentOS ~]# brctl show bridge name bridge id STP enabled interfaces xenbr0 8000.08002754b3fa yes ...
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Is it secure to expose LAN to bridged DSL modem?

I connected my router and DSL Router (in bridged mode) together like this: (click for full image) Strange setup, I know. :) The reason was I wanted my DSL router to continue to work as a switch and ...