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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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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How to configure netflow on linux bridges(“docker0” Bridge)

I have Openstack setup which one of the compute node has docker and if I want to monitor the traffic, how to configure netflow on "docker0" bridge/Linux Bridge. I can see the bridge name and ID with ...
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Packets in bridge get up to the user space without being redirected there

I set up a bridge interface (br0) on PC-A (Linux Ubunutu 14.04) In addition I created an application with a TCP Listener on port 80 in the user-space on PC-A As what I understood from the ...
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186 views

OpenVPN Access Server Site-to-Site Layer 2 Bridging. DHCP Issues

First of all sorry, my english is a bit sucky or broken at parts. I'm having a little issue with OpenVPN S2S Layer-2 Bridging and DHCP over the bridge. First of all, all clients no matter on which ...
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32 views

Linux: NAT from lan to a bridge results in erroneous nat between bridge components. How to fix?

Consider a machine with 3 NIC's. Two bridges are active; from eth1 to a vlan on eth0 and from eth3 to another vlan on eth0. Interfaces: auto lo iface lo inet loopback auto eth0 allow-hotplug eth0 ...
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Xen networking - dom0 receives ARP requests but no reachability

Both dom0 and domU are Debian 8. Dom0 network configuration is: auto xenbr0 iface xenbr0 inet manual bridge_ports eth1 bridge_stp off bridge_waitport 0 bridge_fd 0 auto xenbr0.4 ...
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62 views

Not able to ping ips created inside docker container using namespace in centos7

I have a docker container running inside centOS7. Now docker creates a bridge by default named as docker0 in host system. Inside the docker container, we have created another bridge named as eth2 ...
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214 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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Bridged network tap unable to communicate with client

User has a workstation on OSX that needs to be able to test a variety of VoIP devices by reading all packets sent and received by the test device. Workstation has two ethernet adapters running on a ...
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133 views

tcpdump on bridge interface (virbr) does not receive any packets destined for one of its addresses

Here's the configuration for the interface: # ifconfig virbr0 virbr0: flags=4355 mtu 1500 inet 192.168.11.1 netmask 255.255.255.255 broadcast 255.255.255.255 ether 52:54:00:99:e3:...
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Routing Traffic Through from VPN Client to Switch Network

Network Diagram I have two computers, Foo and Bar, connected to an OpenVPN server on Amazon EC2. Both the computers are connected to the Internet via Wi-Fi. The VPN IP addresses are on 13.8.0.*. ...
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38 views

KVM Guest in vlan + bridge not working

I'm trying to set up a few KVM Guest on a machine with bridged interfaces and vlans. The whole configuration is done in a host with Debian, to be more specific in Kali 2.0 and it has DHCP. Im doing ...
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93 views

KVM guest cannot connect to host, but works vice versa

I have debian 7 on my host machine and I run a KVM vm on it. My hosts network configuration is this (the relevant parts): br0 Link encap:Ethernet HWaddr 68:b5:99:ae:8f:11 inet ...
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12 views

Dell Switches and Spanning-Tree Route ID Configuration

I am analyzing a network for a colleague. It's a fairly simple topology and all the switches have converged on a common root-bridge, however two of the non-root bridges have identified the root as the ...
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48 views

Trying to create one ip subnet in two vlans bridged

The question is am i missing something while creating the bridge between two parts of the same ip subnet? What I am trying to do is to limit local services(by firewall) available to one of ssid's of ...
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59 views

Running two Ubuntu KVM virtual machines with bridged (tapped?) networking

I have a server that's running Ubuntu 14.04, and I'm trying to run two virtual machines with bridged networking at the same time. The networking of the first VM works, but the second one has no ...
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45 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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226 views

How can I connect my switch to my fibre connection?

Question We just got our ADSL line replaced with a Fibre optic line. Part of the Fibre-install included a Fibre panel (terminator?) and a Huawei switch. I'm not sure how to connect our existing ...
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35 views

Multiple IP's on the same bridge

I'm setting up a Ubuntu host machine for a couple of kvm virtual machines. Here is my interface config file: # config block 0 auto lo vmbr0 iface lo inet loopback iface vmbr0 inet static address ...
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34 views

Does the name eth0 matter?

I'm running Debian as the host and have a bridge for the kvm virtual machines. The bridge setup looks something like this: auto vmbr0 iface vmbr0 inet static address 192.168.0.100 netmask 255....
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209 views

how to bring up network-interfaces and bridges in specific order at boot time

Currently, my setup is having many nodes, each having RHEL 7 installed, with each node having only one single interface. I am using ovs-bridge and a vlan-tagged interface within the host. I use vlan-...
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35 views

Debian KVM network setup

I have a server with 4 ethernet ports. I want to use two ports for link aggregation to be used for KVM (virtual guests). How can I go about setting this up properly? Create the link agg first then ...
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74 views

Adding multiple vlan interfaces into bridge (ovs)

I am adding multiple vlan interfaces (eth3.409, eth3.410, ...) to a bridge, furthermore I also add the eth2 interface (local network) to the bridge. eth3 is a trunk with 13 different vlans. The ...
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668 views

CentOS, KVM, VLANs and bridging

I need help designing networking for virtualized guests using KVM. My machine is running CentOS 7 and has 2 NICs. I'd like to achieve the following One physical interface (em1) shall be used for ...
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246 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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Create 3 virtual interfaces that can ping6 each other

In Linux, how can you create 3 virtual interfaces that are bridged together through a virtual switch so that they can ping6 each other? What I did: tunctl -t tap1i tunctl -t tap2i tunctl -t tap3i ip ...
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KVM/libvirt: Guest monopolizes bridge

I'm having a problem in which the first guest started on a VM host can send traffic through both of its assigned interfaces, but subsequent guests can only send traffic through one interface. My VM ...
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2answers
76 views

wget only works when tcpdump is listening

I am running two Virtual Machines over the XEN hypervisor both with Ubuntu trusty (Linaro-Developer version) with the following simple bridge networking setup: Backend domain (dom0): br0 ...
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34 views

VPN with VMware Player [closed]

I have 2 domains, prod and dev. Dev has a 1 way trust from prod (dev trusts prod, but prod does not trust dev). My host computer (laptop, win7 sp1) is a member of the prod domain and can VPN in for ...
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179 views

How to create bridged network interface for Xen?

I'm trying to use Xen on an Ubuntu server for the first time and have a really basic question. I'm following the guide in the Ubuntu docs and under the Network Configuration->Using bridge-utils ...
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31 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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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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Xen bridge - block traffic from port range - iptables / ebtables

I use Xen with bridge interface : - eth0 - viifbr0 - Name of VM interface : vifv10XX.0 Do you know if it is possible to block output traffic from source port range for a domU please ? If yes, can ...
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120 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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454 views

Docker Container can ping, but cannot telnet from Virutal Machine

I have a host (Ubuntu), a docker container (centOS), a virtual machine (centOS). - My Host has 2 interfaces, one is eth0 "192.168.0.4", one is docker0 "172.17.42.1" - My docker container have IP "...
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network configuration (bridging) proxmox

I bought yesterday an proxmox license. All works fine only the network configuration is very complicated. My network configuration: 84.200.50.186 -> hostsystem ip 84.200.50.186 -> VM ip 255.255....
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kvm network bridge on centos 6

I have a Centos 6 KVM host. I installed the KVM following this manual: https://wiki.centos.org/HowTos/KVM Its network has been configured as a bridge: [root@server ~]# ifconfig br0 Link encap:...
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Bridged VirtualBox VM with individual IP

On Debian hosts I run VirtualBox VM mainly to run WinX software. Some of these VM shall join AD and as such need fixed IP and shall be reachable from the LAN, i.e. NAT is no option. I considered ...
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128 views

iptables setup for bridge, redirect dns traffic

I am trying to forward dns traffic on a bridge to a local dns server and it wasn't working. As a thought exercise I decided to block all traffic and that too isn't working. Here is my setup : #/etc/...
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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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81 views

Bridge server for connecting two databases?

I'm in a bit of a pickle. I currently have 2 database servers. One is hosted in the US and is online on the internet. The other is local, working only on LAN and external connections are not allowed. ...
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1answer
156 views

ensure “switch redundancy” on a network

I'm struggling in connecting two Windows 7 PCs (each with a 2 port Intel NIC) via two complete redundant paths. And I want to make it transparent to the services on that system. I was thinking on ...
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158 views

Restarting network on Ubuntu 14.04 host running lxc

I know /etc/init.d/networking restart isn't supposed to work on Ubuntu 14.04 but I altered the script that it works. It always worked on all the Debian distributions I have used before and I do not ...
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1answer
32 views

VPN bridge duplicate routes

I'm trying to establish a VPN bridge between 2 embedded computers. VPN gets established correctly, however once tap0 interface gets created on the client's side, it creates a duplicate route: 192.168....
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TC - delete exact filter

Im't trying to automate traffic shaping on some system n one interface, using next script. This script adds classes and filters by one per class, width command like: tc filter add dev eth0 parent 1: ...
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2answers
135 views

IP conflict on a KVM bridge network connection

We're running a CentOS 7 server, with KVM installed on top of it, and the host has 2 Ethernet interfaces attached to it (em1 and em2). A new windows 7 VM was just created, and we wanted that specific ...
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1answer
334 views

pfsense NAT router - “live with” double nat (airport express)

I have a setup that have worked for years with a fiber to a NAT router to clients. Clients are typically cheap NAT routers of any kind. Setup like this Fiber from ISP | Router, pfsense -WAN - x.x.x....
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Routing issues with bonded VLAN trunk bridged to Xen dom0 on CentOS

I am setting up a new dom0 which has a LACP bond. Connectivity is fine between the network, dom0 and domU's without the trunk enabled. Once I start tagging traffic on the switch and add the ...
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1answer
74 views

ganeti network: change bridge name

I try to add an instance to network, first first I need to connect the network to a bridge. I'm using bridge vbr0 instead of standard xen-br0, gnt-cluster info shows that ganeti has the default set ...
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1answer
822 views

How to route traffic between 2 VLANs on different subnet

I have the following problem: I have one interface eth0 with IP 172.20.51.61/24 I have configured 2 VLANS on the same machine: eth0.120 : 172.20.52.61/24 eth0.200 : 172.20.54.61/24 I also have a ...