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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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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trying to figure out how to bridge two virtual networks together and in turn bridge that to the internet for a virtual inline IDS/IPS system

I'm trying to figure out how to bridge two vmware (server or workstation, workstation) or virtualbox networks together with a linux IDS/IPS system transparently inline between both the virtual ...
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router advertisements do not go through wired/wireless bridge

The full setup: A Netgear CVBG834G cable modem+router (4*Ethernet+WiFi) configured in bridge mode (and WiFi shut down) whose sole role is to serve a public IPv4 address on its LAN port to... an ...
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3answers
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Proper network configuration for a KVM guest to be on the same networks at the host

I am running a Debian Linux server on Lenny. Within it, I am running another Lenny instance using KVM. Both servers are externally available, with public IPs, as well as a second interface with ...
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On Mikrotik RouterOS, is it possible to get Netflow information from a bridged connection?

I have a RouterOS box set up to bridge two ethernet connections. I have use-ip-firewall=yes in the bridge configuration, so that the ports go through the firewall. I've enabled netflow reporting via ...
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2answers
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No ARP reply on tap0 (KVM bridged networking)

I wanted to assign an external IP address to my KVM guest and went the bridged networking way. Unfortunately the guest has no network connectivity and I don't know why. After investigating it seems ...
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412 views

Bridged NIC's but only one active

I've "Bridged" the NIC's in my Server 2003 box but when I do a large file transfer, I see that only one is active at a time. What do I need to do to spread the love across both NIC's? I'm hoping to ...
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How to share internet connection on Mac OS X to Virtualbox vm’s using Host-only

In one line : is the following possible : Airport <- "OS X bridge" -> vbox-Host-only -> vm's Virtualbox (3.1.4) setup : Host : Mac OS X 10.5 Guest : Ubuntu Linux adapter1 - Bridged (en1: ...
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2answers
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Linux software bridge

I have following setup: I want to send files from 10.1.1.7 to 10.1.1.3 with the caveat that if link AB goes down, then file transfer should switch to link AC and CB. However, problem is that the ...
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3answers
557 views

Constantly varying download rate with a complex xen networking setup, why?

The network configuration in my Xen setup is the following: the dom0 has 3 network cards (eth0, eth1, eth2), 3 brigdes (xenbrE, xenbrI, xenbrD) and each brigde integrates the corresponding network ...
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1answer
27 views

Bridge networks via Wi-FI

I've bridged networks before using wired bridges but just want to check that this is also possible via Wi-Fi. In the attached diagram on the left there is the pretty common laptop connected via Wi-Fi ...
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LXC bridge with several IP addresses

While trying to setup a small server with LXC containers, I encountered a problem: I want to assign 4 different IP addresses: 1 address for the host and 3 addresses in a different net for the ...
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1answer
192 views

how to associate a Docker network interface to a Linux network interface (eth5) on Linux host?

My Linux host has 8 Ethernet interfaces, eth0 - eth7. I'm running three Docker 1.9 containers on this Linux host. How can I associate a network interface inside one Docker container to a specific ...
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2answers
226 views

Debian Linux routing additional IP to LXC

I'm trying to route an additional IP of my server from Hetzner to a LXC instance (on Debian Jessie). I've found this guide http://www.jotschi.de/technik/2012/04/18/hetzner-lxc-linux-subnet-...
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79 views

Windows network bridge: STP parameters [closed]

I recently discovered Windows 7 does support STP upon it's own Ethernet bridges. https://reggle.wordpress.com/2011/09/03/hidden-feature-in-windows-7-spanning-tree/ Although the feature is barely ...
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1answer
315 views

cannot ping linux network namespace within the same subnet

Here is a quick summary of the issue. I cannot communicate with a linux network namespace within the same subnet. I am running Ubuntu 14.04.1 LTS on a headless server. I have been troubleshooting this ...
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525 views

Booting a diskless Debian system using bonding, bridging, and iSCSI

I'm trying to build my personal holy grail: booting my Debian Wheezy KVM server diskless from a iSCSI target and the only configuration needed on the diskless server is the iSCSI parameters in the NIC ...
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605 views

Proxmox Host on OVM Hardware - Guest VM's cannot reach Internet hosts by name

I have setup a Proxmox Host on OVM Hardware and am giving the guest VM's Internet access using the Bridged setup. However, as this requires editing configuration files on the Guest to work correctly, ...
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624 views

access tap interface in network namespace across machines

I want to be able to access services running on a TAP interface within a namespace from outside the machine where it is running. I have setup that looks like this - VM1/Machine1 +eth0 : Public ...
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0answers
505 views

Networking with lxc containers with local dhcp and external ipv6 double bridge problems

I want to use both ipv6 externally on all my containers, and ipv4 external only on the hosts. I am using Ubuntu 12.04 64bit. For ipv4 on the container I use the DHCP that came with the lxc ...
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1answer
371 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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424 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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1answer
492 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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1answer
610 views

Xen HVM Windows 2008 network bridge

I have a problem with the Windows Server 2008 guest (hvm). I can't get a network interface running for him. I also have a Debian guest and it's working ok, but I can't do it with the Win2k8 guest. ...
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153 views

dsl router for bridging two lans

I have two office locations that each have DSL service. I have the routers set up so that the two subnets, 10.0.1.x and 10.0.2.x, correctly keep data on each subnet and or pass across to the other ...
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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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1answer
49 views

Spam filtering in bridging

I'm using sendmail with spamassasin, one of my server is working behind it. All the port 25 traffic for the server behind it is being filtered. User are using SMTP authentication enabled in ...
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Site-to-Site IPSec VPN: bridged only

I'd like to setup a site-to-site IPSec VPN tunnel between a head office and a branch office, and for political/security reasons, with the sole purpose of being able to access a "Management" subnet at ...
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4answers
975 views

Can we connect LAN (Ethernet) with a wide area network?

Suppose we want to connect a local area network (Ethernet) with a wide area network, the question arises is, can we connect a local area network with wide area network? If we directly connect the ...
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3answers
4k views

Cannot ping from a bridged inteface

I am trying to bridge between eth2 and br0 from Ubuntu 11.04 within virtual box. There is network bridging to host physical machine. From the guest OS after bridging I can ping from br0 but ...
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Bridged Networking with bhyve and FreeBSD Guests does not work

I have a FreeBSD10 host with bhyve and the following IP-configuration in rc.conf: ifconfig_igb0="inet X.X.X.146 netmask 255.255.255.0 broadcast X.X.X.255" defaultrouter="X.X.X.254" cloned_interfaces="...
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How do bridges really work?

I'm in a major confusion here, regarding bridges. I thought that they were devices that allowed going from one network to a different one without routing (doing the work at layer 2 instead), but if ...
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2answers
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How to bridge a range of public IPs to KVM virtual machines on Debian/Ubuntu

I've been trying for weeks to figure out the right network configurtion for sharing a range of public IPs with KVM virtual machines running on my server, but so far with little luck and with the help ...
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1answer
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Virtual Box: Bridging to Virtual Interface (eth0:1)

I have four IP addresses on my Debian machine: 1 main (eth0) + 3 extra (eth0:0, eth0:1, eth0:2). I want to assign the eth0:1 as bridged network to my VM. Who do I need to add in the /etc/network/...
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1answer
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How should I bridge two networks, given each network has its own subnet & DHCP server?

I would like to join/bridge two different networks, network 1 and network 2: Network 1: A network consisted of a Linux box (with one ethernet) port and multiple clients (connected via LAN switch). ...
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2answers
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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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2answers
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Xen network-bridge interface renaming

According to the comments in Xen's network-bridge script, the process of starting the bridge with external interface eth0 is thus: # Creates the bridge # Copies the IP and MAC addresses from eth0 to ...
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1answer
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Cross-VLAN sharing and auto-discovery of selective resources

I have a network with several VLANs that each contain resources or clients with different access rights. For simplicity, let's say I have 3 VLANs: ID 10: Contains privileged clients and private ...
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1answer
141 views

Prevent hijacking IPs in a bridged network (KVM/libvirt)

Is there a solution to prevent a VM user assign/use IP addresses he doesn't own but are routed over the same bridge like his own addresses? The current setup looks like this with libvirt and KVM: ...
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1answer
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lxc vm access outside the host

On Debian 64bit, I configured a lxc like this : host ip : 172.16.0.25 vm guest on this host : 172.16.0.44 I've done the bridge on my host auto eth0 iface eth0 inet manual up ...
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2answers
435 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 virt-...
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1answer
941 views

How to change IP address on Ubuntu KVM

I have one physical server running kvm with 4 vms on it. For each vm i used an own IP address. Now my colocation provider is changing all IPs. What is the update strategy? Log in on each vm and re-...
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2answers
4k views

What is the difference between flow control and congestion control at layer 2 and 3? [closed]

Is there a difference between flow control and congestion control at the following layers? layer 2(data link layer) layer 3(network layer) If they are not same, then how is each handled at the ...
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2answers
490 views

Bridging with aliased Ethernet card for Virtualizing with single Ethernet card

We are having a server with good CPU and RAM,so we are planning to do XEN virtualization on ubuntu 12.04 server to handle high traffic. The plan is to keep the host machine only to manage VMs(no NAT ...
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Bridge ppp0 and eth0

I have seen many posts explaining bridging eth and wlan interfaces. I would like to know if it is possible to bridge ppp0 interface (a USB modem) and eth0. I have a working internet connection through ...
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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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2answers
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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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2answers
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Xen domU needs to be on different network (vlan) than dom0

We have multiple VLANs setup between different sites, and are using them to connect our dev. network, 192.168.3.x, and a management network, 172.16.20.x. I have a Xen dom0 on 192.168.3.x; one of it's ...
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2answers
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Adding ip address to a bridge interface

Is there really any meaning attached for assigning a IP address to a bridge interface. Note : the bridge is created using brctl and then an IP address is assigned to br0 created. Is there any ...
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2answers
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Linux Bridge, Samba netbios name/hostname access

I am currently running a linux bridge in the following configuration ADSL Modem: 192.168.1.1 Linux Bridge: eth0: 192.168.1.2 eth1: no address Wireless Router: 192.168.0.1 My issue is that i ...