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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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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Static route without knowing the nexthop (linux)

I have an eth3 interface in a linux router, with an adsl modem. This adsl modem is in bridged mode, so the public IP is assigned to eth3 (say 11.22.33.44), and the modem is just not seen by my server. ...
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bridging two network interfaces in ubuntu linux 12.10 AND being able to access it from that machine

Ok, i have about had it but heres the deal. I have 7 total machines connected like this: [5 workstations]<--->ServerPC<---->MAINPC<---->router FYI, dont worry about the workstations they ...
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139 views

KVM guest has a wrong outgoing ip address

I have a KVM host with a bridge configured on eth0 that has a public ip: auto br0 iface br0 inet static address xx.xx.aa.111 netmask 255.255.255.0 network xx.xx.aa.0 broadcast xx.xx.aa.255 ...
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348 views

Connect to internet through DC with 2 network interfaces

I have a network like this : Client 1 <== Wireless ==> Access Point <== Wire ==> DC <== Wireless ==> ADSL Modem Client 1 : IP : 192.168.1.181 DG : 192.168.1.100 DNS : ...
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164 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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1answer
507 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 ...
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Jumbo frames between KVM guest and host?

I am trying to implement a 9000 byte MTU for storage communication between KVM guests and the host system. The host has a bridge (br1) with a 9000 byte MTU: host# ip link show br1 8: br1: ...
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101 views

Bridging Networks Between Buildings

I'm trying to set up a WiFi link between two buildings. On one side I've got a regular SoHo (network A) router (Linksys EA4500) and on the other side I've got an Alfa AWUS036H (network B) connected ...
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KVM is NOT seeing multiple bridges (only macvtap devices)

I am in the process of doing some thesis research about using ebtables and iptables on a KVM host to perform on-the-fly firewall restrictions to KVM guest VM's. Here is the problem: I have a bridge ...
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STP on a bridge

I have set up a bridge on an interface em1 and connected 4 vms to the bridge. I disabled stp on the bridge. There is no chance of looping as there is only one bridge in this setup, there occurs a BPDU ...
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515 views

Xen: can't get Dom0 and the DomUs to ping eachother

We have installed a Xen (4.1) configuration and can't get Dom0 and the DomUs to communicate (ping eachother). The DomUs are able to ping eachother but not Dom0, and Dom0 cannot ping the DomUs. We ...
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3k views

Use one NIC to create multiple interfaces for Linux KVM

I am working on a thesis research project, and I am having some difficulty figuring out how to make one NIC spawn several "bridge" interfaces such that each KVM VM can be seen on the local network. I ...
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475 views

VirtualBox - multiple guests, each with a single bridged adapter?

I am running a dedicated server (located at Hetzner, Germany) that runs VirtualBox in order to virtualize several services accross multiple virtual guests. Those guests are supposed to communicate ...
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1answer
470 views

Can't get network bridging to work

I'm trying to make network bridging to work on a Debian squeeze (I'm experimenting in order to make a QEMU/KVM virtual machine that will be visible to the outside network as if it were a distinct ...
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1answer
342 views

Martian source in log of machine1 after ssh-DNAT to virtual machine located on machine2 (machine1 and machine2 xover connected)

My scenario 2 physical machines, each with 2 network interfaces (eth0, eth1). they act as virtual machine host for one machine alone, the networking works with no problems first i had two ...
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1answer
211 views

networking with one NIC and access to internet and virtual machines

I have installed opennebula and I have followed this tutorial. Unfortunately I cannot ssh to the virtual machines that appear to be in a running state and already have an IP. The problem might be that ...
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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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Bridging LXC containers to host eth0 so they can have a public IP

UPDATE: I found the solution there: http://www.linuxfoundation.org/collaborate/workgroups/networking/bridge#No_traffic_gets_trough_.28except_ARP_and_STP.29 # cd /proc/sys/net/bridge # ls ...
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276 views

Is there a way to create virtual network between vm on xen with out creating shared bridge with n/w interface

xen 4.1.2 is running with ubuntu 12.04 as dom0. I need to enable networking between vm only(which means not creating a bridge between Ethernet card and sharing among vm). when i installed ...
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1answer
144 views

Connectiong adsl router/modem and router with bridgemode

I have one adsl modem/router which is not "top" of the line and it lack allot of options which I need. I was able to acquire one Cisco router recently which has all options that I need ( like DMZ, ...
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bridged connection for windows 7 host and ubuntu guest in vmware player [closed]

I installed ubuntu on my laptop in vmware player 5.0.0 build-812388) under windows 7. I do coding in ubuntu and would like to connect to ubuntu remotely with ssh. From My understanding, I need to use ...
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3answers
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How to find host of an unidentified VM in a network? [closed]

For example someone have installed server with a DHCP on VM connected to a corporate network breaking its operation, so I have IP of that VM, but how to find out IP of its host system ?
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1answer
660 views

Network Bridge in dom0 can not ping domU's

I am using Debian wheezy with XEN 4.1. I have two network bridges xenbr0 and xenbr1. xenbr0 is linked to the real-eth0-nic so the domU's can talk to the outside world, which worked fine. xenbr1 was ...
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Linux: how to verify my network configuration before doing a restart

I am trying to build a network bridge for my VMs on a server. So I added a new file and changed another in the /etc/sysconfig/network-scripts directory. Then I did a network reboot with the ...
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178 views

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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1answer
273 views

openvpn in a bridge?

I have a somewhat tricky proble to solve. We have a wireless link between 2 building. One of them has an mikrotik and below there are some vlans. Some machines of one vlan need to use openvpn to ...
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510 views

KVM with external IP without NAT?

I have a CentOS 6.3 server with 1 NIC (eth0) and an external IP (lets say 1.2.3.4). On this server I'm running a CentOS 5.6 KVM with the "default settings" (virbr0 on 192.168.122.x). What I want to ...
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1answer
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Cisco 877 as PPPoA/PPPoE bridge (no routing) - how to make it listen to IP for management?

I have a Cisco 877 configured to bridge ADSL with PPPoA to PPPoE on Vlan1. This works fine, but in this mode the only way I can configure the Cisco is via the serial console. I'd like to have the ...
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1answer
293 views

Connect ADSL modem SMC7904WBRA-N to CISCO RV082

I have a SMC7904WBRA-N ADSL modem/router that connects to the internet with a static IP given by the provider. I've received a RV082 to create a VPN connection which is having problems to connect to ...
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Creating a network link between 2 very close buildings

I have a charity who have two adjacent medium sized modern detached houses (in the UK): the buildings stand next to each other and are less than 5 metres apart. They have DSL connected to a single ...
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556 views

Openstack - Connectivity between instances on 2 separate nodes

I have the following setup: 1 x Management Node (node A) 2 x Compute Nodes (node B & C) 1 x Volume Node (node D) Relevant configurations: VlanManager multi_host=true Node ...
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1answer
272 views

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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1answer
102 views

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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1answer
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Centos/OVH: public IP on KVM virtual machine

Since a few days, I'm trying to configure my KVM vm to have a public IP address, without any success. First, I'm on OVH, and you need to know they don't allow networking from different mac addresses. ...
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1answer
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Linux bridge (brctl) dosnt forward IP packet when router is one of the bridge endpoints

I have setup a brctl bridge on Ubuntu with the following deployment: Cisco router -> Linux bridge -> client computer The bridge forward the following packets types: ARP,STP, but doesn't ...
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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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openstack, bridging, netfilter and dnat

In a recent upgrade (from Openstack Diablo on Ubuntu Lucid to Openstack Essex on Ubuntu Precise), we found that DNS packets were frequently (almost always) dropped on the bridge interface (br100). ...
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1answer
185 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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1answer
351 views

Debian bridged network between virtual machines

I installed two linux containers (lxc) in a debian squeeze server so the environment is as follows: Physical server: 192.168.2.200 Linux container 1: 192.168.2.201 Linux container 2: 192.168.2.202 ...
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Debian: Should I add vlan interface into bridge for KVM?

I am setting up a Debian Squeeze box as a KVM host. I want to add multiple interfaces to each KVM guest so I want them to be on different VLANs. After reading about this, I believe the best method is ...
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1answer
364 views

Virtual bridged networking with VLAN, could not ping

I require a virtual network with VLAN be build between two virtual hosts - which can be (lxc/ vbox -ubuntu or win xp). I tried with lxc and vbox with Ubuntu and was finding difficult to make it work ...
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2answers
256 views

Ubuntu with KVM guest VM and broken bridges

I have an Ubuntu box with a KVM guest VM running. They use bridging so the guest VM attaches to the physical network of its host. The guest VM has 2 NICs in 2 different bridges. First NIC of the VM ...
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Stop duplicate icmp echo replies when bridging to a dummy interface?

I recently configured a bridge br0 with members as eth0 (real if) and dummy0 (dummy.ko if). When I ping this machine, I receive duplicate replies as: # ping SERVERA PING SERVERA.domain.local ...
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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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Wireless bridge settings

Using two TP-Link WA-5210G, I am trying to create a network bridge between two networks, netA and netB. I want to share my internet connection from netA to netB, using the AP from netB. netA :: ...
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Network bridging in VM broke connectivity to host; what did it do?

I screwed something up royally, but I want to understand how exactly I screwed it up. Bear with me because I'm not a networking expert. Here is how my network is configured: [HyperVHost] ...
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MAC address table in Windows

How can I see the MAC address table of a Windows network bridge? Is it possible trough command line to find this information? EDIT: I am interested to see the same table that it is possible to see in ...
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1answer
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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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How can I prevent the locally administered bit being set on network bridge MAC addresses in Windows?

When adding network adapters to a network bridge, it generates a new MAC address from one of the unbridged ones but with the locally administered bit set. For example, if the original MAC address is ...