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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New KVM guests cannot access outside LAN

I have a KVM host (at 192.168.0.10) that currently has one working KVM guest (at 192.168.0.12). On attempting to install a new KVM guest today, I reached a problem where the network on the new guest ...
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Why VM cannot get the public IP I have from provider?

I have a KVM-Host (on Debian) with root@kvm-host:/# cat /etc/network/interfaces auto eth0 iface eth0 inet manual auto vmbr0 iface vmbr0 inet static address 176.x.y.133 netmask 255.255.255.224 ...
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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 ...
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1answer
384 views

How to configure a network on KVM using only public IPs?

I have a KVM server and two VMs. I have one main IP and two additional "single" IPs (not a subnet). I don't want have a local network with private addresses on my KVM, but I want to assign my public ...
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1answer
971 views

LXC container with bridge networking exposes fake MAC address to external network

I'm running LXC container (lxc 0.7.2-1) on Debian squeeze with bridge networking configured by the book with public IP and I have problem that it exposes fake MAC address from LXC container to ...
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2answers
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IPv6: ADDRCONF(NETDEV_UP): eth2: link is not ready & IPv6: ADDRCONF(NETDEV_UP): xenbr2: link is not ready on Ubuntu Server - Xen bridge

Hi all, I am having some problems getting a Xen bridge up in Ubuntu precise with Xen. I created a first bridge on eth1 with no problems, but the exact same process for eth2 yields the following ...
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395 views

Bridging two wireless interfaces with brctl?

I have this topology: [internet] ^ L-------[wlan0]-[host]-[wlan1]-----[client-1] I tried to bridge wlan0 wlan1 but it wont work with brctl; but magically when I issue this command #iw ...
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493 views

Unable to ping gateway via bridge nic

I'm trying to install KVM on Ubuntu 12.04 server. We have multiple nic on this server of which we primarily use eth0. The server network runs fine(i'm able to ping gateway, ping dns server and ping ...
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1answer
2k views

linux container bridge filters ARP reply

I am using kernel 3.0, and I have configured a linux container that is bridged to a tap interface in my host computer. This is the bridge configuration: :~$ brctl show bridge-1 bridge name ...
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2answers
405 views

Xen Networking - Separating Dom0 from DomU

I'm having some issues regarding Xen Networking and I was wondering if you could point me in the right direction. I have a server with 2 NICS (Xen over Ubuntu Server - Xen Bridge scripts) Each NIC ...
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2answers
485 views

How to 'bridge' the newly bonded NIC?

I bonded eth0, eth1, eth2 and eth3 of my server to create a single bond0 interface using the ifenslave package. Now I wish to create multiple Virtual machines on this server in order to set-up a ...
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521 views

After adding interface to a bridge, internet connection is down

I want to create a bridge on my Ubuntu machine, to build virtual OSs. I did: sudo brctl addbr br0 sudo brctl addif br0 eth0 sudo brctl stp br0 on sudo ifconfig br0 up dhclient br0 After sudo ...
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2answers
947 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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1answer
164 views

KVM firewall to disallow internet access for group of guests

I've got a KVM server inside a local network (192.168.10.0/24). This server has three interfaces, which are all publicly bridged [1]. Atm I'm only using two of the three interfaces, so the virtual ...
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1answer
334 views

KVM Physical NIC access

I'm new to KVM. I have a host with 4 NICs. I want to set this up, is it possible? eth0+eth1= bond0 -> internal network build two guests each guest will have network access to 2 subnets ONLY eth2 -> ...
0
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1answer
115 views

How to bridge two lan but keeping their clients using/choosing their own wan?

this is my first question here so please bear with me if I haven't made it super clear So I have 2 piece of Cisco RV180W router hardware. The office is moderately big and one single Wifi router is ...
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1answer
302 views

Linux bridge static IP using only one NIC

It seems like I have a generic problem, but can't find any solution - every solution that I found so far on internets doesn't work for me. Let me first try to explain what I am trying to do - I have a ...
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1answer
536 views

DHCP server on bridged connection

I want to put DHCP server on Ubuntu server to listen on 10.0.0.1 (internal network). I also need to configure OpenVPN server on Ubuntu server (DHCP is going to lease addresses to OpenVPN clients), ...
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65 views

No HTTP connectivity in vbox guests with bridged network

I'm running Ubuntu 12.04 Server x86. Network connectivity is on eth2 for the host server (the 10ge card). I installed VirtualBox 4.2 using the downloadable deb package from VirtualBox's website. ...
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Why do I need to assign static ip address to the bridge and not to the physical interface? [duplicate]

I have bond0 with two physical interfaces in it. Normally I used to assign static IP address to this bond0 to set up internet connectivity on the server. Now, because of LXC virtual guests, I had to ...
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if there are 2 NIC on the same machine, can a tcp client on one NIC connect to a tcp server on the other NIC?

I use tun/tap to create a tun NIC tun0 with IP 10.10.10.2, and I have a real NIC eth0 with IP 202.112.34.49 then I run a tcp client which binds its socket to 202.112.34.49 and a tcp server binding ...
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1answer
43 views

bridge on openVPN client

I have some problem with setting up what i call a "remote entry point" (i'm sure ther is a real name for this) First things First : Here is my setup : ...
4
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1answer
541 views

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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2answers
233 views

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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1answer
445 views

openvpn (tun0 + bridge) : Comunication bridge --> tun0 works but not the opposite direction

My network is composed as follows: Host A with ip 9.x.x.x and vpn ip 192.15.206.x (openvpn client) Host B with ip 9.x.x.x and vpn ip 192.15.206.1 (openvpn server) this host has a bridge br0 with ip ...
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1answer
740 views

VPN laptop as proxy gateway for Intranet computers truss bridge/bypass

I have a Windows 7 Enterprise VPN laptop to access my client's VPN network. During VPN session the laptop can not accept any request from my Intranet even if I open any door using Windows Firewall ...
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1answer
373 views

Changing the mac address in a libvirt xml config file breaks network connectivity for the guest

I'm using Xen with libvirt and trying to set it up on a bridged interface. I am able to install an OS and everything works as I would expect. If I save the xml output from "virsh dumpxml guest", edit ...
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1answer
253 views

Network traffic is not being forwarded from a VM to the network using a bridged interface with Xen + libvirt

I'm having trouble getting network access from a VM that I'm running using Xen and libvirt. I've been trying different things and reading similar posts online for a couple of days but I'm really stuck ...
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2answers
412 views

Linux Bridge allowing TCP but not UDP

I am using a linux bridge for monitoring some traffic on two vlans. I created two bridges br30 et br40 for each. My problem is that the TCP traffic make it through but not the UDP one. I thought of ...
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147 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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OpenVPN bridge failed to forward packet

I have a pair of OpenVPN bridge working for my school. The bridge works well, it did bridge ip traffic between the 2 sites. My problem is, if a user turn on a PC after the bridge has already started. ...
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1answer
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OpenVPN server on Windows 7 - How to route specific IP addresses to clients?

Okay, so I do not have a strong background per se in computing, nor networking, and I'm really just starting to learn this stuff now, for a relatively small family business of ours. It is rather ...
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1answer
204 views

Debian bridged wifi connection doesn't start with system [closed]

I have t debian pc which is used as router. I'm using hostapd for creating wireless acess point, and i've bridged ethernet and wifi using brige-utils. My /etc/network/interfaces auto lo iface lo ...
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630 views

debian KVM - network bonding fails with vlan and bridge

i have a Debian 6 system configured with 2 NICs these NICs are used on a bond (bond0) which is used by bridge that require to use VLAN. i can get connection between guests running on VLAN10 but it ...
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1answer
641 views

Xen guest - cannot get network connection beyond the host

I've just installed a XenServer 6.1. It came with a standard configuration, network 0 connected to NIC 0. I created a VM but I can't reach any network beyond the host. From the VM (172.18.32.20), I ...
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2answers
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How do I bridge multiple physical ports in ESXi 5.x?

As the title says, is there a way to bridge multiple physical ports in ESXi 5.x such that they are not load balanced? I essentially want each physical port to be "plugged" into two separate ports on ...
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2answers
379 views

Creating a bridge for Xen

I am currently stucking at creating a bridge for Xen. My current interface file looks like this: auto lo iface lo inet loopback auto eth0 iface eth0 inet static ...
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2answers
572 views

Default gateway and bridged interface

I have slackware based server with openvpn bridging, this is my settings of interfaces: root@senior:/# ifconfig br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet ...
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0answers
144 views

how to carp two interfaces on same node?

I have this CentOS machine with 2 interfaces. eth0--> br0 (.10) eth1--> br1 (.11) Although part of the same network, each interface is being fed from a different switch. I use each bridge in ...
0
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1answer
837 views

how to connect two different lans [closed]

I have in my office two different LANS with two different ISP. Lan A is faster than Lan B. We want to share files and printers and everything as if it was only one LAN, the thing is that we don't ...
0
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1answer
332 views

Can I bridge between two different networks?

I have a VirtualBox VM which has: eth0: 10.0.2.15/24 default-gateway: 10.0.2.2/24 Within that VM I have 2 LXC containers (i.e. two other virtual machines) VM1 - eth0: 10.50.50.50/16 (connects to ...
3
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1answer
3k 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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336 views

OpenVPN: Run 'bridge-start' on boot before starting openvpn service (Ubuntu)

I've got OpenVPN working properly on my server, using bridge-start and bridge-stop scripts to create and remove network bridge, respectively. How do I set these scripts up to run bridge-start at boot ...
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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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3answers
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Bridging eth0 to wlan0

I'm trying to create the followig setup: +----------+ | Wi-Fi | +----------+ ...
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4answers
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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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1answer
249 views

Convert wifi to wired using wireless router [closed]

I have a TP-Link WR740N, a Raspberry Pi (With only an ethernet port for Network), and a Wifi connection. Is it possible to use the wireless router to bridge the Pi with the Wifi connection?
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arp reply is not processed

My eth0 interface does not process a legitimate arp reply. When I try to ping a host, I see arp request and reply with tcpdump from the host I try to ping from, but ip neigh says that there is a ...
0
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1answer
199 views

KVM guest can't find gateway

I try to setup a KVM server with bridged networking. I followed the docs, but still can't get it working. The guest system can ping the host system and the host the guest system, so the connection ...
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2answers
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Bridge networking static IP's to virtualbox VM's

Ok, so I have a dedicated server with the static primary IP address 89.200.xx.xx, it's running 3 VM's in virtualbox (all Centos 6 as is the server) and I have 3 other IP's that I want to assign to the ...