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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Linux bridging for KVM

I have a Debian Wheezy machine on which I tried to setup KVM with bridged networking. Unfortunately, the bridge does not appear to forward traffic correctly. My setup is the following: The physical ...
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KVM virtualization with two bridges, want routing to use each bridge as mapped in KVM

I can't seem to find an existing question like my scenario. I'm using 2 public bridges for 4 VMs. Two VMs per bridge device. Interface stats show there is use of the assigned bridge for the VM on ...
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KVM Networking guest issue due a provider networking limit

I have a KVM setup on Centos 6.4 64 Bits. My server provider assign us a Main IP to the Host with a gateway and netmask. Also our provider assign us additionals IP ( not in the same block as the Main ...
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LXC Container Networking

I just started to experiment with LXC containers. I was able to create a container and start it up but I cannot get dhcp to assign the container an IP address. If I assign a static address the ...
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WP forwarding remote discrete servers?

I need some help with a really odd server configuration: I have a server which is wired (eth0) and it will be serving a series of WP web pages. From this web page, using a forwarding product, I ...
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110 views

Understanding an OpenVPN bridge from iptable's point of view

In my scenario, there is a machine which acts as both an iptables-based firewall and an OpenVPN-server at the same time. It has two network interfaces - eth1 is connected to the internet whereas eth0 ...
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196 views

openvpn server for mobile access routing/bridging

I'm running a web server on an IPC and want to get access to the network with VPN, because the customer doesn't want to host his data directly on the internet. This web server runs a webapp, which ...
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116 views

KVM bridging for virtual machines is not working

After restarting the server, I can not ping and reach my virtual machines from the net and vice versa [root@pc1(192.168.0.114) ~]# ping 192.168.0.63 PING 192.168.0.63 (192.168.0.63) 56(84) bytes ...
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806 views

Iptables: Matching packets for bridged interface

I'm building a firewall configuration tool based on iptables, and trying to get a "bump in the wire" scenario working. Given a setup with eth0 and eth1 in a bridge br0 and a third interface eth2: ...
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47 views

How am I able to assign an IP to a bridge interface

From what I read, bridging happens below IP layer, yet how am I able to assign an IP to a bridge interface ? brctl addbr br0 ifconfig br0 IP promisc up What does the OS do ? it sounds like it ...
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35 views

NIDS on bridged firewall

I have a firewall (Debian Stable 7.5) which works in bridged mode. The interfaces eth0 (WAN) and eth1 (LAN) are linked with the bridge interface br0. Can I deploy a NIDS (eg. Snort) on this server? ...
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Failing to setup OpenVPN Client (tap) on Ubuntu 14.04 - Viscosity works with same Server

I'm kind of desperate for help here... So I'm trying to setup a Client Machine to make a VPN Connection accessible to my whole local network. When I connect directly from a Computer in the local ...
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129 views

All connections to a bridged domU originate from the dom0 public IP instead of real IP

I have a Dom0 with a mixed configuration: bridged networking and NAT is set up. There is one NIC connected to the internet (& 3 more that are unused). This is my interfaces file: # The primary ...
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548 views

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" ...
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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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398 views

arp problems with transparent bridge on linux

I've been trying to secure my virtual machines on my esx server by putting them behind a transparent bridge with 2 interfaces, one in front, one at the back. My intention is to put all the firewall ...
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276 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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67 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 ...
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Bridged Connection weird IP release in the NAT router

I use Vmware Player 6.0.2 to run linux on my linux machine with no vmware tools. Both linuxes are Slackware 14.1. In my guest system I have a web-server with bridged connection. Both, host and guest, ...
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287 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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552 views

How accessing a NATed, virtualized (LXC) server over public IP from client itself on a bridged network?

Setup ____________________________ ____________________________ | Host | | Client | | Public IP: 66.66.66.66 | ...
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xen creating a new virtual machine with bridge networking

I am using CentOS 6.5 64 use this tutorial to setup Bridge [root@CentOS ~]# brctl show bridge name bridge id STP enabled interfaces xenbr0 8000.08002754b3fa yes ...
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267 views

Ping (DUP) with Linux bridges and tap devices

http://imgur.com/qPoy2QJ I have two Linux (Ubuntu 12.04) VM (running on KVM) that networked together using two Linux bridges as shown above. The network interfaces are Linux TAP devices. The problem ...
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220 views

Force all traffic from servers on the same bridge to pass through router interface

I have a bridge with all hosts from the 192.168.5.0/24 network connected to it.They all connect to this bridge via a secondary interface eth1. I have a router which connects this bridge to others on ...
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303 views

bond interface without link on boot

After a server reboot, bond0 has not been started since one of its slave ethernets (eth2) had no link, I had to manually set it with: ip link set dev eth2 up Server has one bond to the LAN (with ...
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204 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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355 views

How do I configure bridged networking for VMs

I'm setting up a KVM virtualization server in CentOS 6. How do I configure bridged networking? (I think I need network interface eth0 to be accessible to VMs) I have tried to follow this guide: How ...
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iptables configuration for squid proxy in bridged mode

I recently set up a squid proxy in bridged mode. But Squid is not caching due to some firewall issues I guess. Manual caching is perfectly ok. Here is what I have set up in /etc/rc.local ifconfig ...
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Multicasting on server with bridged interfaces

Network: 10.1.1.2 and 10.1.1.3 in same network. 10.1.1.2 has VPN server running in bridged mode. 10.1.1.4 - ip address of VPN client. All machines have Debian 6 installed. I'm trying to test ...
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44 views

If one subnet can see another does that mean that there is a bridge between two interfaces?

This might seem like kind of a dumb question, but...say for example... I have a router running OpenWRT or some Linux distro and that router or box has two interfaces (lets say for sake of example a ...
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brctl bridge forwarding packets to promiscuous interfaces

I have two promiscuous sniffing interfaces on my linux box: eth0 is connected to an external vlan bridge eth1 is connected to an internal vlan bridge with eth0 I can sniff all traffic on my ...
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How can i prevent TINC from relaying DHCP

I am running tinc in several NAT routers running Debian 7 Wheezy, the VPN works fine for months, except because i've set it up in switch mode it relays DHCP requests and answers over all the VPN. The ...
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Access KVM guest via hostname on private virtual network

KVM on CentOS 6.5. Setup one bridge connected to internet. And one virtual network on subnet 192.168.100.0/24 DHCP start: 192.168.100.128 DHCP end: 192.168.100.254 How to ...
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Forward connecting IP address to KVM guests

I'm running kvm with iptables configured to use DNAT and masquerading. However the guest machines are logging the host bridge ip not the connecting client IP address. Is there a way to configure ...
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Ubuntu/KVM Bridge Interface IP Assignment

I have a Ubuntu 12.04 LTS machine running KVM/libvirt. It has two physical ethernet interfaces. I have dedicated eth0 as the primary interface and configured bridging on eth1 for my VMs. The KVM host ...
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Scanning tagged traffic over bridge through iptables

I am working on bridge on linux box using brctl. Now I have to scan and monitor bridge traffic through iptables. So for the same I changed: net.bridge.bridge-nf-call-iptables = 0 to ...
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Setting up bridged LXC containers with static IPs

I'm trying to setup multiple LXC containers on a host, each with public static IPs of their own. My host is running the latest Ubuntu. It has a single network interface named eth0. The static IPs ...
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124 views

How to use the same IP for dom0 and one domU in XEN

I have currently a Xen on a debian wheezy dom0. I have 6 (public) ips and I would like to setup 6 VMs (each using one IP). To keep access to dom0, I'd like dom0 ssh to bind on one IP port (lets say ...
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assign public IPs to vm guests

I have a set of public IPs for virtual machines. Each unique public IP is to be assigned to a unique guest. With bridged networking I share eth0 with KVM machines. The ifcfg-eth0 file has ...
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How to assign multiple public IP address for 3 KVM guest using a single NIC [closed]

i've a CentOS 6.5 KVM Host with 3 KVM-Guest CentOS 6.5. Now I want to assign a public IP for the host and one public IP for each guest using a single network interface. My IPs (assigned by network ...
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Bridging Adapter in Ubuntu 12.04 LTS for KVM

Fresh install of Ubuntu 12.04 LTS with libvert/KVM installed. I have 2 virtual machines that I need need to be on the same LAN as the host. The host has two physical interfaces eth0 and eth1. eth1 is ...
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267 views

Questions about bridging VLANs

If, across the same building, I have two physically separate networks to connect devices together via simple switches, my understanding is that I could save myself some hardware-complexity if I were ...
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574 views

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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500 views

brctl addbr and bonding not working for CentOS6 if IPv6 is disabled

I set up a CentOS6-XEN4-Server according to these instructions. Now I want to set up bridges - first manually: brctl addbr test - but this fails with: "add Bridge failed: Package not installed" ...
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My KVM machine can't get the network

I'm setting up a virtualization server for my company based on Fedora 19 and KVM. Our goal is to being able to convert and run a bunch of VirtualBox VMs. So I setup my F19 server, and created a br0 ...
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Make a bridge with two ports behave like a veth pair

I have a linux bridge with two ports, namely p0 and p1, and I would like to modify the bridge behavior so that every frame showing up in one port is relayed to the other port and viceversa, i.e. the ...
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Ethernet Bridging With USB-to-Ethernet Adapter

I have a USB-to-ETHERNET adapter (CP-USB-RJ45M) with which I am trying to create an ethernet bridge in CentOS Linux for ip-forwarding within a private LAN test network. I modified my /etc/rc.local ...
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bridging multiple openvpn networks

Is it possible two bridge multiple openvpn networks like following - root | ---------------------------------- S1 C1 C2 ...
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Assign ipv6 address to KVM guests on bridge mode

System: CentOS 6.5 Network: Bridge on br0 IPv6: ISP Native /64 block. IPv4: ISP address (not internal LAN) Purpose: To assign IPv6 only to guests (manually), I don't want ipv4 address to be ...
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bridge, vlan and internet access. How?

I'm trying to setup a working connection between my local network and the internet. First I setup a bridge (br0, has an IP address where the other interfaces don't) between eth0 (LAN) and eth1 ...