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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Create and bridge virtual network interfaces in Linux

I have a tool that replays traffic from a .pcap file and another tool that interprets that traffic. For testing purposes, I need to play traffic out one interface and have it come in another. ...
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Can't ping from VM to node on host network, but can arping

I have a KVM instance running inside of an Ubuntu host. I'm not able to ping/connect from the VM to the private interface of a physical node on the same private network of the host, although I can ...
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Use MikroTik Bridge as a Public IP Firewall for Public Hosted Servers

We want to do this: Internet<->MikroTik in Bridge Mode with Firewall Filter<->Hosted Server The primary objective is to allow RDP and FTP in from the outside but block everything else from ...
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Install KVM on VPS how to configure network bridge

I want to install KVM on my VPS server, but I don't know much about setting up network bridges unter Linux (Debian Squeeze). In /etc/network/interfaces I have no eth0 controller, there is only # ...
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Force linux bridge to obtain ip via DHCP

I'm trying to understand the logic behind the failure in the following scenario: a. If a linux bridge with 2 interfaces, eth0 (LAN) and eth1 (WAN) is behind an ISP device e.g. a cable modem, it does ...
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KVM VMs and virtual network, how to assign external IP addresses?

So, my question is: there is a remote server on Red-Hat with an external IP-address, eth0: inet addr: 87.112.140.53 Bcast: 87.112.140.255 Mask: 255.255.252.0, and is a virtual interface, which raises ...
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configuration of bridge to send traffic to external switch

I created 3 VM on top of KVM/QEMU (RHEL 6.0) using bridged networking. Created one bridge for eth1 and all the VM's are using that bridge for networking. All these VM's have the same subnet address. ...
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Opennebula KVM onevnet

I am experimenting with Open Nebula and KVM and so far I have a frontend and a few hosts (all hosts have two NICs for redundancy). I know that KVM makes on the hosts a virtual interface virbr0. ...
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Combine two NIC's into one preserving routing (DMZ server / Windows or Linux)

We have a DMZ server with two NIC's, one is accessed from the Internet (public IP) and one from behind the internal firewall (private IP). One application has problems to cope with a 2 IP's / 2 NIC's ...
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route all internet traffic via a virtual tap device and a public server on windows [duplicate]

We want to route all traffic from one pc to a local virtual device (TAP-Win32 Adapter which is also used by OpenVPN) and then from there to another tap device on a public server. after that all ...
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iptables / bridge / NAT setup

Between our gateway and our LAN, we have a bridging firewall running iptables. I want to add an additional NIC into the firewall and set up a private subnet on it. Traffic from this subnet which is ...
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Linux storing arp cache entries using wrong interface

I'm trying to get two virtual machines (running CentOS) to talk to host (Ubuntu 10.04) using VDE and the outside network. So far I'm running into an ARP issue. On Host I have a physical eth0 and a ...
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How do I put a bridge on top of a bonded interface?

I'm setting up a Ubuntu Server 11.10 box with multiple Ethernet interfaces that are bonded for redundancy. I'm planning to use it as a KVM host, so I'll need a network bridge. To accomplish this, I ...
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Linux bridge (brctl) is dropping packets

I have been researching this problem for a few days and have not found an answer yet. Your help will be really appreciated! I have a few VMs (Virtual Machines) running on a physical server. The ...
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Problems with umlauts and git-svn

I've got the following problem: I checked out an GIT-repository created by tortoise-git under windows. German umlauts like "öäü" are shown as \x-Codes under my linux. That's basically no problem ...
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fail2ban with bridge-util

Hello and happy new year, I am wondering if I can use fail2ban on a virtual host that uses bridge-util. I am using LXC containers for virtualization and have therefore direct access to all the log ...
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How can I change the MAC address of a network bridge in Windows?

I use DHCP reservation rather than static IP for convenience, and that relies on the MAC address of my computer. I recently bridged my main adapter with my VirtualBox adapter. When things stopped ...
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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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KVM bridging for virtual machines not working?

I'm currently setting up a KVM with several VM guests. I created the first one but I ran into the first problem already: root@vm1:~# ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. From ...
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Is there a way to install L2TP and OpenVPN on one machine and bridge between both VPNs?

I am trying to install both OpenSwan-L2TP and OpenVPN on a Debian server and bridge between both server, is there a way to do that?
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KVM and bridge_stp setting

In which situation one should enable the bridge_stp for the host bridge when using KVM? Is it worth keeping it disabled when not needed?
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Add Two Bridged Interfaces on Ubuntu for KVM

I have ran the following; sudo /usr/sbin/brctl addbr br0 sudo /usr/sbin/brctl addif br0 eth0 And added the following to /etc/network/interfaces; auto br0 # for XPProxx86 KVM iface br0 inet dhcp ...
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Real life virtual bridge setup on Debian

How do I get the bridge setup done with multipe IP addresses. Ideally, I would have 4 virtual systems each with it's own IP address but also an intranet address (like 10.#.#.#). So that they can ...
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Trouble with NATing

I'm a networking noob, so sorry for the very generic title. I have the network setup in the following way: A few details about the network: eth0 on all the devices have an in IP in 10.10.10.0 ...
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After configuring OpenVPN in bridge mode my serve becomes unreachable from an outside network

I have configured a Debian server with OpenVPN in bridge mode according to OpenVPN's ethernet bridging guide. As part of the guide I ran the bridge-start script which creates a bridge and tap ...
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ARP reply vanishes from br0 to tap0 using OpenVPN in bridging mode

i have setup a linux box (on an esxi5) which acts as an openvpn server. the server is configured to use bridging for the clients, which essentially works, with one exception. if the client pings some ...
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Point to Point wireless network

I have to link two offices 0.62 miles apart with a wireless link. So far my setup is as follows : 2 24db directional parabolic wifi antenna 1 watt wifi amplifiers on each antenna Access point on ...
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How do I configure a Huawei b520 ADSL router to work in bridge way?

I have a much better router now, Cisco e4200 but I still have to use the Huawei b520 router because the internet connection is using ADLS. I want to configure b520 to act in a bridge mode and be ...
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How to prevent IP spoofing using MAC and ebtables?

I am trying to create IP-MAC pairing rules in ebtables. There are few tutorials and related questions [1] available but I have kind of specific setting. ENVIRONMENT: I have many physical hosts. Each ...
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Cisco 871 IOS BVI: Distinguishing incoming and outgoing

I understand that a BVI is very much equivalent to a network switch. But it includes the benefit of being able to have an access control list. I am doing this, but I would like to more effectively ...
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Setup a local bridged connection using VirtualBox

I'm trying to forward/masquarade some trafic from my guest CentOS6 (virtualbox with bridged connection). Host is OSX Lion. Here is my network layout: en1 - host iface address: 78.251.xx.yy ...
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Bonding/Teaming 2 NIC cards : pro and cons

I want to get your idea on bonding two NICS on a server that is connected to a single subnet with only one IP address in a Gigabit LAN enviroment. What is the pros and cons of having two teamed ...
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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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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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How is this wireless mode called?

I have the following situation and I don't know how to ask google. I have a cabled LAN segment, lets say 192.168.1.X. One of the nodes there is a wifi router 192.168.1.3 that creates wireless ...
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Can I bridge IPv4 while routing IPv6 on the same two interfaces?

Is it possible to bridge aliased interfaces? And use their standard "parent" interfaces independently with full functionality? Here's the scenario: I have a Linux based firewall and router with two ...
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KVM guests lose connectivity after networking restart

we're setting up an ubuntu server 10.04 host with kvm. The host is setup with a bond and bridged interfaces to allow the guests access to the network without natting. Our current configuration is ...
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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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Centos KVM Host OS not passing all network traffic Guest OS

I'm running KVM on Centos 5. I have a guest OS, ubuntu 10.04, that has Snort 2.9 installed on it. The guest OS has (2) nic's, eth0 and eth1. One nic, eth0, is configured with an IP and can be ...
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What is the correct way to setup a bonded bridge on Centos 6 for KVM guests?

What is the correct way to setup a bonded bridge on Centos 6 for KVM guests? I'd currently playing around with a setup of two KVM-hosts which will each host several guests. I have two HP DL380:s with ...
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Can ufw on a kvm host restrict traffic to guests?

I've set up a number of guests running on kvm on Ubuntu. Network access for the guests is via network bridge with br0 sitting on top of eth0. I have ufw running on the host machine and this is ...
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xen-4 single nic dom0, add second bridge

im running xen4, my dom0 is debian6 It has a single nic and im having hard problems creating a second bridge to have two virtual nics inside my guest. i tought on using dummy dev, but i had read ...
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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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How to use VirtualBox as a router without NAT between two subnets?

My host machine is in a 192.168.2.0/24 subnet and I wanted to set up a 10.0.0.0/8 network with various hosts in VirtualBox that talk to each other. So VirtualBox should act as a router between those ...
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Network bridge and broadcast ethernet frames

Let R1 and R2 be two (wireless) routers. Both R1 and R2 have one wired interface eth0 and one wireless interface wlan0. On each router, both interfaces are bridged on br0. So: R1.br0 = R1.eth0 + ...
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can't ping between bridged macvlans

I have 2 addresses one on eth0 one on eth0.1. eth0.1 was created like this: ip link add link eth0 name eth0.1 type macvlan dhclient eth0.1 does not get an address, even though eth0.1 does even ...
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bypass ip destination squid tproxy bridge

I have configured a squid transparent tproxy. All works fine. Now I need all the traffic going to an external IP (internet) does not pass through the proxy. Do I need to modify iptables, ebetables ...
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Moving to Ethernet Extension / Short Haul Data - Do we route or bridge the existing subnets?

We currently have two sites connected via a vpn over a 4mb leased line. Site 1: 172.16.0.0/24 Site 2: 192.16.0.3/24 Thankfully the contract is about to end, so we are looking at upgrading to a ...
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Watchguard Firewall - bridge a public IP to another interface?

I have a Watchguard XTM 8 series firewall, and it is setup in mixed routing mode. I have a /24 public IP range and I want to pass one of those IPs to another interface on the firewall WITHOUT using ...
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dns lookup doesn't work after setting up network bridge

DNS lookup worked fine until I setup network bridge. How to repair it? ifconfig: br0 Link encap:Ethernet HWaddr f0:ad:4e:00:90:a1 inet addr:192.168.1.84 Bcast:192.168.1.255 ...