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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Linux: How to simulate several IP- and MAC-Addresses for networktesting in one linux box

I want to test a network with one linux-box which should get 100 different IP-Addresses, each with an own MAC which should be used as source MAC-address when communicating to other devices. I've ...
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881 views

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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118 views

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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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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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 ...
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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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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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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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Differences between bridged and NAT networking

I don't fully understand the differences between NAT and a bridged connection over an virtual machine. As far as I've found, machines which are on the same network with our host machine can access our ...
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399 views

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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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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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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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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292 views

Packets only get forwarded when tcpdump running on bridge

I ran into the oddest thing when trying to debug a networking issue with OpenStack. I was doing a ping test between virtual machines. The ICMP request packets only made it to the destination host if I ...
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145 views

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 ...
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882 views

IP Bridge for KVM with multiple subnets

I have a machine set up running KVM and a bridge on eth0 with the ip address for the machine. The machine has an IP address in a range with no more ip adresses free. I am trying to make a second ...
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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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358 views

Using OpenVPN on Two Linux Machines *not on the gateways* to link the networks over the internet

I am running OpenVPN linking two linux machines on two networks. These machines are not the networks' gateways. There are also separate DD-WRT routers which are acting as the gateways on both ...
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1answer
3k views

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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532 views

Configure iptables with a bridge and static IPs

I have my server set up with several public IP addresses, with a network configuration as follows (with example IPs): eth0 \- br0 - 1.1.1.2 |- [VM 1's eth0] | |- 1.1.1.3 | \- ...
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Question about working of bridge in Ethernet (CSMA/CD) Network

Bridges and CSMA/CD Networks Suppose two LAN segments A and B connected to each other by a bridge. In the steady state (when bridge has learned the locations of the computers on both segments) the ...
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Bridged virtual interface is not available or visible to ifconfig

I'm running Ubuntu 9.04, kernel 2.6.28-18, and vmware-server 2.0.1. I'm attempting to setup a virtual linux machine to use a bridged interface rather than NAT or host-only. Both NAT and host-only ...
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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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debian lenny xen bridge networking problem

DomU isn't talking to the world, but it talks to Dom0. Here are the tests that I made: Dom0 (external networking is working): ping 188.40.96.238 #Which is Domu's ip PING 188.40.96.238 ...
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191 views

Ubuntu/KVM Bridge Interface IP Assignment

I have a Ubuntu 12.04 LTS machine running KVM/libvirt. It has two physical ethernet interfaces. I have dedicated eth0 as the primary interface and configured bridging on eth1 for my VMs. The KVM host ...
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311 views

Setting up bridged LXC containers with static IPs

I'm trying to setup multiple LXC containers on a host, each with public static IPs of their own. My host is running the latest Ubuntu. It has a single network interface named eth0. The static IPs ...
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Bridged network connection not working on Ubuntu VM

I am in a corporate environment and there is 802.1x authentication set up which is using my windows credentials + domain to authenticate. Setting up that information for my connection in the VM only ...
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893 views

VirtualBox bridged adapter can ping but can't curl

There is a delicate server running Ubuntu Server 12.04.2. There are 4 useable IPs for this server: A, B, C, D. The server itself takes A. The server is now running two VirtualBox guests, both with ...
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Bridge to a used eth1 card without losing connection via that card

How can I set bridge between a real eth card on a remote machine without losing my ssh connection to that machine. I ssh into a machine via its eth1 iinterface. 172.168.40.2 255.255.255.0. I ...
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Bridge NICs with automatic pass-through

I am looking at using a computer with a dual-NIC card (one with two NIC ports) as an in-line traffic shaper / URL filter / traffic analyzer, etc. (probably using pfSense), but I am concerned that if ...
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Remotely connect to isolated network

i have a network which is isolated from the Internet and I need to remotely connect to it from time to time for maintentance purposes. Please note that i do not need to connect to a specific computer ...
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KVM-Guests can't get past bridge - no internet connection

I'm running a backported KVM on a Debian Squeeze. ATM the KVM-Guest can't connect to the internet through the bridge I have set up. The guests can reach each other, the host but nothing outside. I can ...
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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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1answer
79 views

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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snmpd configuration to enable BRIDGE-MIB or Q-BRIDGE-MIB

All the Ethernet switches and access points on my network provide snmp access to the bridge learn table except for my linux-based bridge. Does net-snmp support exporting the bridge forwarding ...
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ubuntu 10.04; kvm bridged networking not working with public ip addresses

I have a dedicated hosted server box with ubuntu 10.04 64 bit installed. I would like to run kvm with ubuntu 8.04 installed for some php 5.2 compatible apps(they don't work right with php 5.3, the ...
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1answer
176 views

MAC address for DHCP when using bridge with 2 NICs?

I have a Ubuntu system with 2 NICs where I want to create a bridge br0 and bind both NICs to that bridge using the bridge_ports eth0 eth1 option. I also want to configure the bridge to get an IP ...
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1answer
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KVM bridging for virtual machines is not working

After restarting the server, I can not ping and reach my virtual machines from the net and vice versa [root@pc1(192.168.0.114) ~]# ping 192.168.0.63 PING 192.168.0.63 (192.168.0.63) 56(84) bytes ...
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1answer
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How can i prevent TINC from relaying DHCP

I am running tinc in several NAT routers running Debian 7 Wheezy, the VPN works fine for months, except because i've set it up in switch mode it relays DHCP requests and answers over all the VPN. The ...
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1answer
128 views

Filter broadcast traffic in a bridge port

I have a linux bridge with three interfaces, e.g. tap0, tap1 and tap2. What I would like to do is to modify the standard bridge behavior in the following way: If a L2 broadcast is originated from ...
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864 views

Bridging eth0 to wlan0

I'm trying to create the followig setup: +----------+ | Wi-Fi | +----------+ ...
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Access to WAN from one VLAN

i want to create a VLAN for 3 guest VMs. I already have it and every VM can ping each other, but the problem is that any guest CAN NOT have access to Internet Network configuration in Host machine # ...
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bridging real and virtual wireless network interfaces

I have 2 wireless interfaces, one real (eth1) and one virtual (vt0), running on top of the same physical wireless adapter. Both have separate IP address spaces. eth1 is connected to a laptop, and vt0 ...
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how to block access from bridge mode vpn nodes to my wan gateway

We have a tap bridge between 2 local networks. It work great except that clients from the 'other' network can use dhcp server and most important can use wan gateway of the second network which is bad. ...
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Cannot access LAN Printer

Environment: I have a Brother 7360N Network Printer connected to a TPLINK Router over an Ethernet cable. My desktop, running Windows 8 is connected to the TPLINK Router over an Ethernet cable. A ...
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xen and libvirt bridge configuration

I have a Centos 5.5 server with Xen 3.2 and libvirt for virt-manager installed. Before installed libvirt I have the bridge configuration just like the documentation on Xen says: xenbr0, eth0 and ...
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Assistance with bonding vlans and bridges on Ubuntu 12.04

We're trying to set up four nics in bond0 with 3 tagged vlan's and three bridges for KVM VM's on Ubuntu 12.04. Using the interfaces file below I can manually start and stop networking and get the ...