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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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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85 views

pfsense with 4 WAN IP and outgoing NAT

I have a pfsense with a single wan ip, i want to assign multiple wan ip's. The pfsense machine is located on a vm machine with the other servers i wish to NAT forward. I want to give each server a wan ...
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Trouble understanding how to setup network Bridge on Ubuntu 14.04.2 to act as a web content filter

I am trying to build an Ubuntu server to act as a web content filter, using Squidguard and Dansguardian. There are great resources such as this: ...
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826 views

openbsd pf squid transparent proxy using a bridge

I want to use OpenBSD 5.7 as a filtering bridge in front of my router, and as part of that run a transparent proxy (squid 3.5.1) to manage web access. I have set up the openbsd machine as a bridge, ...
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233 views

Xen: network between dom0 and domU does not working, while network between particular domUs does

I am unable to establish communication between domU and dom0. I have two domUs and they are able communicate between each other. Dom0 is connected to Internet. I just need network between dom0 and ...
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978 views

Unable to set a bridge over bonding on Debian

I have a Debian 8 Jessie machine with two interfaces (eth0 and eth1) bonded in balance-rr mode (aka 0). It works smoothly, but when I try to set up a bridge on it, it doesn't work. My ...
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Add a second bridge to a virtual machine

We have a ubuntu-12.04 host running another ubuntu-12.04 virtual machine with kvm virtualization and bridged network interface on eth4. This network allows the virtual machine access to the outside ...
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76 views

How to setup 2 switch with VLAN and 2 IPs for each in different block

Below I have depicted the required network. In this network: Lets say GW1 is in IP1 block and GW2 is in IP2 block. There are 2 Linux running PCs with 4 NICs. 1st Linux PC is connected to 2 GWs with ...
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287 views

Problems simulating bridge with OpenWRT virtualbox

I have setup a BarrierBreaker OpenWRT instance in virtualbox. WAN is NAT adapter LAN is internal network I have attempted to bridge these interfaces as I wish to start learning ebtables. However ...
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Why must the IP be configured on the bridge device? [closed]

My understanding of a network bridge is having a kind of "virtual switch" which virtually connects the network devices (that were added to the bridge) as if I would connect them to a real switch with ...
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295 views

How do I connect a SoftEther bridge to a server without getting an authentication error?

I've been playing around with SoftEther, and I'm trying to use the VPNCMD utility to create a site to site VPN. However, when I try to get the Cascade connection up between the bridge and the server, ...
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Bridge on vlan on teaming for KVM

I have problem to create bridge on vlan on teaming. Why I do something like that? - Kvm needs bridge - Vlans because I need vm’s in different subnets - Teaming in option active-backup (small HA) I do ...
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359 views

Trunk vlans inside openvz container (Proxmox)

I have a node running OpenVZ CT (ProxMox). eth1 on HN are bridged through vmbr1 to veth device on CT101 (eth1 inside container). (Host Node) eth1 -> vmbr1 <- veth101.1 <- eth1 (CT101) No ...
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1answer
922 views

Xen VM won't come up: could not find bridge device xenbr0 (configured to use routed)

I am using xen 4.4.1 on an Ubuntu 14.04 server, my DomU is running Ubuntu 14.04 Server as well. I've run this DomU in bridge-mode previously no problems. However I want to switch to a routed setup. I ...
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78 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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591 views

Amazon EC2: OpenVPN server won't route bridged packets from client to VPC subnet

I have a bridged OpenVPN setup on a Linux server in an Amazon EC2 VPC. (Spent hours on docs, reading similar problems, here, openVPN forums, no luck yet.) The bridged interface is up and contains ...
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Bridge interfaces without IP in Debian

I need to bridge 2 VLAN's on some different interfaces without IP address. How i can do this? auto eth4 iface eth4 inet manual up ifconfig eth4 up mtu 9000 auto eth4.1320 iface ...
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Make lan ip's available to external devices over openvpn [closed]

My goal is to make my home media library available to external devices. External device ====== OpenVPN Server ====== unknown Modem ----- OpenWRT --- lan machines External devices are OpenVPN ...
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136 views

Is there a way to query all the mac addresses in a network?

I know this question was flagged "off-topic" and "non-professional", but when creating a gateway or IDS, this might be quite relevant. Also, Google finds nothing usable... There is a thing called ...
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340 views

Qemu Proxmox VM - Network access to guests for BackupPC backups

Environment I rent a dedicated server from OVH and installed Proxmox 3.3 (which is based on Debian 6 Wheezy) in order to create and manage multiple Virtual Machines on it. Each VM is configured to ...
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123 views

What does the @ means in ip link show command?

I am new to Linux network admin. I was learning the ip commands with one of my colleague's server with ip link command. When I try to show to one of the vlan information, I see this: vlan1@eth1: ...
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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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235 views

Enabling bridged connections with a single network card with multiple IP addresses

I have a server with one network card in it (eth1). My server is assigned 5 public IP addresses and it is currently configured like this (/etc/network/interfaces): # The primary network interface ...
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271 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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Network bridging - what's the point?

I'm having hard time trying to understand how bridges work. What's the idea behind them? Most sources say their main role as connecting two LANs. They are layer two devices. But wait a second, how can ...
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Bridging two datacenters

i need to find out what would be best way to bridge current datecenter with new DR datacenter. I have following network configuration (show in picture). http://i.imgur.com/7bohb3I.jpg So on internal ...
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329 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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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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213 views

how to make this bridge to work?

I have posted a similar question at: http://stackoverflow.com/questions/27873819/customising-docker-network-doesnt-work# To simplify the question, let me get rid of docker. This is the network ...
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108 views

Bridge configuration on OpenVZ

I have been using an OpenVZ environment left behind by a previous employee. A while ago I needed to use virtual eth devices to try a specific application. After removing VETH might have misconfigured ...
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Bridge behavior when MAC address is not found

Lets say, a uni-cast packet is sent from one system to another system. The packet passes goes to the bridge. But the bridge does not have any information about the MAC address of the destination. What ...
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NIC bonding over bridged GRE-TAP: not getting replies… unless I run “tcpdump”?

I'm trying to get Linux bonding working over a VPN (GRE-TAP). The funny thing is, that it only works when I have tcpdump running on both hosts, but more on that later... There are two machines, ...
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Proxmox with an Openvswitch bridge

All, I'm trying create a way for me to be able to use the local network within my Proxmox infrastructure. Currently, everything is running off of NAT from wlan0 and all internal machines have the ...
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277 views

Linux bridge not answering arp packets

I'm trying to setup a test scenario regarding linux bridges for which I need a full virtual IP stack. Basically, I'd like to simulate the network between a VM (or container) and its host, just without ...
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361 views

Filter mirrored port traffic using iptables

I receive traffic from a mirrored port and I would like to send it into an NFQUEUE for processing. Because of the mirrored port, the packets destination MAC addresses are not my host MAC address. ...
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1answer
924 views

Dummynet Filtering not working on FreeBSD 10

I am trying to do network emulation using dummynet in FreeBSD 10. I have this working in 9.3 however things must have changed and I cant determine exactly what but my setup no longer works. I have ...
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356 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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can't ssh into KVM VM despite using bridged network

I'm trying to access a KVM virtual machine running inside my company's network. I am VPN'ed into the network from my laptop and can ssh into other VMs, and I set up my VM to use a bridged network for ...
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153 views

Blindly bridging wireless client with MAC NAT

This is the usual "I want to bridge wifi with ethernet" question, but I need something specific here. My Linux box has a wlan0 interface which is in station mode, with MAC aa:aa:aa:aa:aa:aa, and a ...
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409 views

qemu, kvm: Guest: No DHCPOFFERS received

I'm trying to set up a virtual machine (guest) wich should act as router (ubntu 14.04). The host is a CentOS 7 machine (4x LAN). The guest should get a public ip address over it's eth0 (guest), wich ...
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202 views

Sniffing packets coming out of “tap interface” when bridge connects to vlan tagged interface

So, I've a tap interface that's created by kvm which belongs to a VM being managed via libvirt. The bridge consists of eth0.123 (here eth0.123 is a vlan tagged interface) & the tap device. ...
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317 views

Debian Bridge Network Connection — Static IP Addresses

I have a PC with 3 Ethernet ports. I am able to share internet to the other two ports with internet coming in on eth1. I use the following setup on /etc/network/interfaces after aptitude bridge-utils ...
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375 views

why linux bridge shows 2 mac addresses for one qemu vm?

I am new to qemu networking and pretty confused about the following situation. I launched 5 VMs. Each connects to br0 through a tap device. I also have a dnsmasq listening on br0 for DHCP. The ...
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806 views

High packet loss with kvm, bridge and bonding

I have 2 servers connected through cisco linksys sg500. Both hosts have identical configuration (Ubuntu 14.04 LTS, 4 * 1Gb/s network interfaces with bonding). When I set up bridge and interface ...
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628 views

bridging LXC containers to host network with different IP range

I'm pretty new to linux, and I have been struggling with a problem for the past week or so... I am trying to setup a cluster of LXC containers on a workstation (host) which is has IP 192.168.10.33 ...
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361 views

Can't access KVM Host (network brige)

I have a strange problem since I rebooted my KVM Host running CentOS 7. I have a network bridge which was going fine, I could access my KVM hosts and guests, but since reboot, I can't access the ...
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Linux - Disable routing but allow bridging

I have a Linux server that is running the KVM hypervisor. I have multiple bridges on this server (that are on different VLANS). Is there an "easy" way to make sure that bridge hoping (i.e. routing ...
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111 views

CentOS 6.5 Bridged Networking Fails

I have a CentOS 6.5 Server that I wish to host VPS on, as well as installing SolusVM, to do this I need to bridge the network adapters for the Server and the VM's ( so the VM's can connect to the ...
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125 views

how to connect/bridge two interfaces on different processes

I have two processes A and B (simulating real hardware device), each with their own TAP interfaces. If I want to send an ethernet packet to A, I send it on interfaceA, and similarly if I want to send ...
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979 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 ...