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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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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3answers
664 views

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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2answers
1k views

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
1k 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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645 views

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 ...
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1answer
176 views

Multiple IPs on eth0, bridging to VMs and routing

Current situation: I have a host running 3 virtual machines. One IP for eth0 (xxx.xxx.xxx.239) and one additional for eth0:1 (yyy.yyy.yyy.35). This works fine for me... Host (eth0) (xxx.xxx.xxx.239) ...
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1answer
531 views

Bridge Networking in XEN other than Default xenbr0

i need to create a bridge with public ip for assigning public ip to VM. But how can i create a Network bridge,as there is a default "xenbr0" bridge exists. Editing Xenbr0 is not permanent,how can i ...
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2answers
308 views

how to setup a bridge for vpn in a second eth interface acting as a router?

I'm trying to create a bridge in order to setup an openvpn server in an ubuntu box, which acts as a router for a local network on eth2, but without success. This is my last conf, but every time I ...
2
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1answer
390 views

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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1answer
3k views

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 ...
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5k views

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
924 views

How do I keep a bridge enabled on a bonded interface?

I'm working on setting up a pair of CentOS 6.3 servers that will run a couple of KVM vms and have come across a problem setting up a bridge on a bond. I am using Mode 4 (802.3ad) bonding on a pair ...
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1answer
128 views

Accessing WRT54G admin through WET610N bridge

I am using a WRT54G router to host a few computers and servers. I have another computer that is wired to a wireless bridge, which is a WET610N. How do I access the admin page of my WRT54G through my ...
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0answers
339 views

kvm bridge network not working

I have several KVMs and using public bridge mode. VMs can talk to each other but VMs can't access real network and the host can't reach VMs. One weird thing is that it used to work before and it ...
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2answers
4k views

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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1answer
643 views

firehol (firewall) with bridge: how to filter

I have two interfaces: eth0 (public address) and lxcbr0 with 10.0.3.1. I have a LXC guest running with ip 10.0.3.10 This is my firehol config: version 5 trusted_ips=`/usr/local/bin/strip_comments ...
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1answer
2k views

Routing Traffic on Ubuntu to give Raspberry PI Internet Access [closed]

I'm hoping someone can point me in the right direction for setting up my Linux (Ubuntu 12.04) box to route traffic from eth0 to wlan0. I'll try and explain the problem I am trying to solve: I ...
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2answers
140 views

need advice on data center move, communication with both facilities during transition

We are beginning the process of moving to a new facility. Office and warehouse operations will both be moving, and we must get shipping operations up and running at the new location while continuing ...
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1answer
693 views

Adding vifs to bridge under Xen suddenly stops working

We have a setup here with around 30 Dom0s running Xen 4.0.3 with a Dom0 Kernel of 2.6.32.57 x86_64. (We have seen the same behaviour with Xen 4.0.1 and kernel 2.6.32.2X earlier) Sometimes all of a ...
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1answer
519 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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1answer
772 views

NFS and KVM. Slow Speed

I have a KVM virtualization in Debian with 2 guests (Debian and Windows 2008). I want to have a 'mount point' shared that can be accessed by the 3 system (host and 2 guests) at the same time. So the ...
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1answer
156 views

Virtual bridge/switch for Windows server&client? [closed]

I can't find a very simple application, with litle to zero configuration on both client and server side which would help one computer to bring other computers on an existing private LAN. OpenVPN ...
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1answer
1k views

Bridge and OpenVPN with shorewall

I have this scenario and everything it's working OK, but I want to configure my Shorewall and I can't do it. My interfaces are: br0 (bridge of eth0) tun0 (OpenVPN) vnet* (each one of bridged ...
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1answer
486 views

Two network interface bridges - one LAN

I have little bit lack of linux networking understanding, so there is my question: We have 2 computers (SRV1, SRV2). Each of it has 1 NIC and both are connected by OpenVPN bridge Configuration: ...
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179 views

multicast network based on bridges between two hardware servers

+------------------------+ Internet +----------------------+ | Server_1 | | | Server_2 | | VPS1 ---- br0 __ | (router) | __ VPS4| ...
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1answer
597 views

Bringing an IPsec tunnel on the hardware node to the OpenVZ containers

I have a server hosting OpenVZ containers. An IPsec tunnel is configured on the hardware node (HN) and I'd like to make the remote network available in the containers (CT). How can I do this? The ...
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1answer
664 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 ...
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2answers
1k views

NATing IPv4 while routing IPv6

I've the following setup: client(s) <---> (eth0) router (eth1) <---> wan I have a static IPv4 address and a /48 IPv6 address block. I need to connect all the clients to (wan). Each ...
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3answers
304 views

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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2k 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
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When I restart my LXC environment, the container does not re-bind to the IP address

The IP does no longer respond to a remote ping With restart I mean: lxc-stop -n vm3 lxc-start -n vm3 -f /etc/lxc/vm3.conf -d -- /etc/network/interfaces auto lo iface lo inet loopback up route ...
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1answer
194 views

Can I make Windows behave like an ethernet hub?

I have two machines A and C mutually connected to NICs on a third machine, B, as follows: A-B-C B is a Windows 7 machine configured with a bridge containing the A-B and B-C NICs, so that A and C can ...
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2answers
456 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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3answers
3k views

Is there a way to determine which virtual interface belongs to a virtual machine in a kvm host?

I'm using qemu/kvm whith bridged networking. In the host machine there are several "vnetX" network interfaces without IP. I'm looking for a way to know which vnetX belong to a virtual machine. I ...
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1answer
2k views

OpenVPN up directive not working

I'm having trouble setting up OpenVPN on my server running CentOS 6.2. I have used OpenVPN on this server before and it worked (although that was with Ubuntu, now I'm using CentOS). I just reformatted ...
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3answers
2k views

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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1answer
150 views

basic help for Nat configuration needed

I have a server with a IP 1.0.0.5/24. This is the main IP address of the server, and now I have two other IP addresses for the server, they are 1.0.2.30/24 and 1.0.2.31/24. I want to make a VirtualBox ...
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242 views

Is this one network or two networks?

I have this simple question and really don't know the answer. Does the drawing below show one network or two networks? This is a question about the definition of a network from the OSI / TCP/IP model ...
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2answers
484 views

Proper way to expose VirtualBox' machine to network via “one MAC” security locked switch port

Say, we need to expose LXC container (LXC) or Virtualbox VM (VBM) to public network with its own IP-adress (within additionaly assigned network — ADD-net) which is to be routed through main host. When ...
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3answers
663 views

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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0answers
131 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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2answers
338 views

Bridging: OpenBSD vs Linux [closed]

The bridge interface under Linux is quite dumb. In the end, it's just very inconvenient to use: you have to delete all IP configurations from the attached interfaces and somehow migrate the ...
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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 ...
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Creating a private network for two VMs

I am trying to create two VMs which are both connected to the same private network. I'm using Linux with qemu-kvm 1.0. My plan of attack has been this: brctl addbr bridge ifconfig bridge up tunctl ...
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1answer
393 views

DELL switch CAM table don't show MAC from different network

I'm solving problem with slow DHCP request/respons about 45 secs...toplogy is [L2] DELL 6248 -> [L2->L3] router (cisco) -> firewall Debian server with DHCP -> gateway to internet I think that problem ...
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410 views

bridge network between two linux servers

I need to set up following network architecture : Internet ^ +-----------------+ | +------------------+ | Centos6-1 | | ...
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1answer
1k views

Bridge Intrusion Prevention Vyatta

I am trying to create a bridge with ThreatStop, IPS and block a few ports. This bridge will sit in front of my servers. All is working apart from the IPS. I have read the documentation on configuring ...
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2answers
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VMWare Player guest does not re-aquire IP on bridged interface after host loses and re-acquires network connectivity

I am running a Ubuntu Linux image in VMWare Player on my laptop. The host is Windows XP. There are two network adapters configured in VMWare Player - one is host-only and the other is bridged. ...
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346 views

How to bridge multiple wireless access points (and internet entry points) into one network

I have two DSL lines coming in to wireless access points and then running to a RV082 Gateway/Bridge. The gateway then runs to a switch, which runs to multiple PCs and a Printer (See picture below). ...