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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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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893 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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386 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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400 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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723 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 B[eth0=192.168.6....
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183 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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423 views

Opennebula KVM onevnet

I am experimenting with Open Nebula and KVM and so far I have a frontend and a few hosts (all hosts have two NICs for redundancy). I know that KVM makes on the hosts a virtual interface virbr0. Now,...
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213 views

Turnkeylinux lampp guest doesn't have internet connection

I've set up a turnkeylinux lampp server in virtualbox with two network bridged connections, one for when I'm plugged in to my router, and one for when I'm using a wireless connection. This allowed me ...
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39 views

bridged LXC: container's mac address learned on wrong interface

Ubuntu host has p2p1.17 physical interface attached to bri17 bridge. LXC container FOO has following net config: lxc.network.type = veth lxc.network.link = bri17 lxc.network.hwaddr = 00:16:3e:aa:aa:...
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149 views

pfsense bridge of vlan interfaces

Hardware Setup AMD E1-2100 Mini-ITX Motherboard with Onboard Gigabit (re0) Intel PCI Express (x4) 4-port Gigabit Adapter (igb[0123]) Software Setup pfSense v2.3 I'm trying to replicate my ...
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45 views

policy routing to guests on other server

After long searching I've found the answer to my challenge, but the last step fails. I have two identical servers that both serve multiple guests. The servers have two interfaces: one for the ...
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44 views

Bridging of Internal Network in KVM

I am working on a project regarding deployment of VMs as internal network, which should be accessible from external LAN, in KVM. I am stuck in bridging these virtual machines. My setup consists of ...
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267 views

pfSense bridging Wi-Fi and LAN: allow access between Wi-Fi and LAN

EDIT: Why would I want to do such a thing? This is a test, and there is 1 machine behind pfSense that I wish to manage, and Wi-Fi makes that easy. Carrying on: The auto-suggessted topics by Server ...
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151 views

Ubuntu + bridge +qemu + tap + virtio dropping packets

I've got what I think is the standard qemu bridge/ubuntu tap interfaces set up running variety of VMs on my Ubuntu host. All the VMs I'm having trouble with are Windows images. I have researched this ...
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19 views

OpenVPN TAP interface security

Background: I am very naive about how bridging works. I wanted to know bridging interfaces exposes devices on both ends of the bridge to communicate? Question: How secure is the openvpn tap ...
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109 views

Intermitent connection issues inside LXC

I am experiencing connection issues inside a LXC that are driving me mad. They are intermitent. They appear during some time, and they suddenly disapear. Scenario A lxc inside a host. Both are ...
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43 views

OpenVPN bridged mode, cant access private network

I am struggling with this problem and I just can't figure it out. I am using cloud servers and I got a private network from them with ip's 10.99.x.x and netmask 255.255.0.0 I have 2 servers: ...
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29 views

L2 Bridging two Locations

I'm not really experienced in Advanced Networking topics, so any help would be much appreciated. We have to temporarily bridge the Network (multiple VLANs) of two Buildings over the Internet for two ...
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17 views

Bridge Mode with fail open

I have a GNU/Linux server running an HTTP reverse proxy (Nginx). The upstream server is well-know (IP address on a subnet). What I would like to "guarantee" is that in case reverse proxy goes down, ...
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113 views

How to make a simple network bridge in Vagrant?

I'm trying do set up the most basic network bridge demo in Vagrant. I have two machines in the same subnet, but on different LANs, and a bridge machine with two interfaces and a network bridge that ...
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126 views

OpenVPN Bridged client can't see rest of subnet

I've got an OpenVPN setup using bridging mode, as I need both clients and computers on the network to be on the same subnet. My server has eth0 and tap0 bridged into br0. The server can ping both ...
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1k views

docker0 bridge status toggles between enabled/disabled, what could be causing that?

I have some CoreOS bare metal instances that are displaying unusual behaviour on the docker0 bridge device. On one of the instances where this has been occurring, I'm running couchbase server and it ...
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82 views

Debian Linux Bridge Mode not forwarding

I am trying to bridge LAN adaptor eth0 with the eth1 interface exposed by sierra wireless LTE modem. When I create a bridge using the following commands: brctl addbr br0 brctl addif br0 eth0 eth1 ...
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92 views

STP fixes non-looped network. Dumb switches kill network. Can anyone decipher this wireshark readout for me?

Greets long story short we had a power outage here and when the network came back online it would crash out to a flood of ARP requests. This would lead to packet storm/network loop, but after ...
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296 views

Can a single physical interface act as a “slave” for multiple bridge interfaces?

Can a single physical interface act as “slave” for multiple bridge interfaces? For example, br0 and br1 would use eno1 physical. Got KVM host with 4 physical nics, each nic assigned to a different ...
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337 views

ubuntu route all client eth0 traffic to openvpn on client tun0

OpenVPN client has 2 physical interfaces: eth0 = 192.168.10.14/24 gw 192.168.10.1 eth1 = 192.168.10.17/24 gw 192.168.10.1 tun0 = 172.160.1.6/24 gw 172.16.1.5 Server is external somewhere listening ...
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1k views

How can I block all traffic to/from an bridged interface while allowing DHCP?

I have a PC (running Fedora 20) that is being used as a "software switch" to control the network connectivity of some external devices. There are eight such devices; the PC has two 4-port Ethernet ...
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375 views

Equivalent to TYPE=“OVSPort” DEVICETYPE=“ovs” OVS_BRIDGE=br-ex in Ubuntu 14.04?

Is there an equivalent to TYPE="OVSPort" DEVICETYPE="ovs" OVS_BRIDGE=br-ex in Ubuntu 14.04? The system is OpenStack Icehouse with 3 nodes (controller, network, compute1) each on a VirtualBox Ubuntu ...
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1k views

Bridge PPTP VPN with local network

I have configured on my Ubuntu a VPN server using PPTPD. I can connect to it from outside of my LAN, I can use it's internet connection. But I cannot see my LAN clients (because the VPN and the LAN ...
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2k views

Xen Vif creation xl vs xm

Hi everyone, I switch my server from a xend/xm Xen install to a 4.1 xl Xen install. Therefore Xen does not create vif network interface when I launch xl create /etc/xen/my_server.cfg but does create ...
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155 views

LXC not respecting netmask on Ubuntu 14

I have a LXC machine configured with bridging so that it has its own public IP address and is accessible over the internet. Even though it's working, the netmask address set in the VMs /etc/network/...
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576 views

Linux Transparent Bridge with trunk VLAN

I want to ask if this scenario is possible with Linux version 3.10 stock standard kernel to manage traffic in a transparent bridge mode. I have a connection now between the LAN switch to the one ...
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457 views

Linux Bridges - Tags on interface vs. on bridge

What is the difference between tagging on the bridge vs a physical interface then adding that tagged interface onto the bridge? I'm assuming if I want two total VLANs segmenting network traffic to ...
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1k views

Xen dom0 bridge interface drops a lot of RX packets?

I'm running Gentoo Hardened as Dom0. It also acts as a router/NAT. There's a bridge interface called br0 which contains a pci-e wlan card, ethernet nic & domU. bridge name bridge id ...
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48 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 : ||==============================================...
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282 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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408 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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220 views

multicast network based on bridges between two hardware servers

+------------------------+ Internet +----------------------+ | Server_1 | | | Server_2 | | VPS1 ---- br0 __ | (router) | __ VPS4| ...
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266 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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479 views

Combine two NIC's into one preserving routing (DMZ server / Windows or Linux)

We have a DMZ server with two NIC's, one is accessed from the Internet (public IP) and one from behind the internal firewall (private IP). One application has problems to cope with a 2 IP's / 2 NIC's ...
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237 views

Cisco 871 IOS BVI: Distinguishing incoming and outgoing

I understand that a BVI is very much equivalent to a network switch. But it includes the benefit of being able to have an access control list. I am doing this, but I would like to more effectively ...
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176 views

xen-4 single nic dom0, add second bridge

im running xen4, my dom0 is debian6 It has a single nic and im having hard problems creating a second bridge to have two virtual nics inside my guest. i tought on using dummy dev, but i had read ...
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925 views

Can a virtual mikrotik box bridge a hyper-v internal network with a hyper-v external network?

I am trying to set up a Mikrotik router as a transparent firewall on my network. I got the machine working on a hardware MT box, but my boss wants the MT virtualized. I have been trying the set up ...
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1answer
149 views

email spam filering in bridging

I've a mail server, which handle multiple domains. Due to concern of spam and mail server performance. I've configured another machine which will be in bridging and mail server would be behind that it....
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192 views

Shorewall Bridge

How do I create a rule Shorewall for bridging port 443 from eth0 to eth1?
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302 views

KVM wireless bridged networking mode not operational

Why does KVM not support wireless bridge networking mode, whereas VirtualBox and do it very well? parprouted doesn't help. I want to allow KVM guests to act as if they have a bridged network ...
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1answer
186 views

Xen need to realize 2 lan interfaces 1 - for Lan between domU and 2 - Internet

Anyone know how to realize lan between domU machines at one interface and actually global net at another interface? I reading wiki about routing and bridging and unable to fully understand it http://...
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541 views

Strange 2Mbps limit for single tcp connection on 24Mbps ADSL2+

I've D-Link DSL-2500U/BRU/D, ADSL mode is "ADSL2+ AnnexM EU-56", configured as bridge and connected to linux (Gentoo) workstation. Line is good enough, I've stable speed 2.09MiB/sec (i.e. about 18-...
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274 views

Cisco 1242 WAP Bridging

I'm looking to connect two facilities with a a pair of Cisco 1242 access points and am looking for advice on configuration. We have multiple VLANs running that will need to be passed through the ...
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62 views

Minimal requirements to firewall rules for running dhcpd server in linux container

I want to run isc dhcpd server in lxd (lxc) container. But it does not recive clients requests (DHCPDISCOVER, DHCPREQUEST) from clients without this rule: iptables -I FORWARD -m physdev --physdev-is-...