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 - 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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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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24 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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20 views

Routing with bridge and multiple taps

I have a server with VPS nodes and 3 dedicated servers in other DCs. I use OpenVPN with tun devices and policy routing for packets being routed to a correct server like this ip route add via 10.0.0.1 ...
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5 views

double router configuration for fxs

I have a very cheap router provided by the ISP, which crashes now and then because there are too many devices attached to the wifi. I want to buy a good adsl+router supporting the AC frequencies, but ...
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63 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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2answers
68 views

Guest networking not working on Debian Jessie Host server KVM with br0 bridged network

GUESTS networking not working at all. In other words guest can not ping host or lan gateway. I have br0 bridge already created, also brctl show that vnet0 was properly added by KVM to br0 on guest ...
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Port forwarded on dedicated host, won't work on guest. KVM

I have successfully set up KVM virtual machines on a dedicated host, but I have one problem. I am trying to run a few gameservers on port 27015 each in their own instance and dedicated IP. On the ...
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24 views

How to identify hosts with bridged adapters

We have an issue with our Windows DHCP server randomly having bad address errors. The current top theory is that there is a host within that pool with bridged network adapters, causing all sorts of ...
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56 views

Debian don't forward through L2TPv3 more than mtu l2tp virtual interface

R3--R1--Internet--R90 R3: ip addr 10.123.0.3 R1: sudo ip l2tp add tunnel tunnel_id 699 peer_tunnel_id 699 encap udp local 5.254.174.8 remote 5.254.174.90 udp_sport 699 udp_dport 699 sudo ip l2tp add ...
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83 views

How should I bridge two networks, given each network has its own subnet & DHCP server?

I would like to join/bridge two different networks, network 1 and network 2: Network 1: A network consisted of a Linux box (with one ethernet) port and multiple clients (connected via LAN switch). ...
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17 views

Bridging multiple VLANs in linux

I'd like to clarify some issues I have with bridging tagged traffic on Linux machine. I have a 2.6.20 (802.1q, bridging, ebtables are enabled) kernel and a device with two net interfaces (eth0 and ...
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164 views

Azure Site-to-Site VPN with a Linux based router to bridge the VPN ports to a RRAS server while keeping NAT for other traffic

I am trying to get an Azure Site-to-Site VPN up and running using RRAS but require help configuring my router's iptables to bridge the VPN ports and protocols to the RRAS server without using NAT ...
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2answers
60 views

Can I use a server to employ link aggregation between 2 unmanaged switches [closed]

From everything I read, If I wish to use link aggregation between 2 switches, they need to be managed switches--specifically, they need to support 802.3d spec. Now that I fully understand the ...
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26 views

openvpn bridge works, but I can't get any other server on the network

I was configuring openvpn server, and I got the keys and the connection to work pretty fast. However, I can't get the client to connect to other instances in the vpn network, which defeats the whole ...
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71 views

KVM Bridge with external ip with windows server 2012 guest

I'm currently setting up a guest windows server with kvm/qemu on a unbuntu 14.04 host and a bridged network connection to allow the server to be exposed over the internet. I'm trying to give my ...
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76 views

Transparent bridge proxy between gateway with DMZ and router

I'm attempting to build a transparent bridged proxy using ebtables, bridge-utils and squid3 as seen in the following article. ...
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20 views

Dynamips Virtual Router not pinging external host after bridging

I have setup a virtual router image with dynamips and setup bridging between tap0 interface of the virtual router and eth0 and br0 with commands [root@cisco_host]# brctl addbr br0 [root@cisco_host]# ...
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2answers
114 views

VMware two vSwitches Guests can't communicate between them

I have some servers in this configuration: (complete configuration) And I am not able, from VMGuest1, to ping either VMGuest3 or VMGuest4. I can, however, ping Host1 and Host2, which are attached ...
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176 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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17 views

Can I create separate bridges for every lxc user?

I have successfully created unprivileged lxc containers for one user on a system. All of those containers use the default lxcbr0 bridge. Now I want to allow other users on the system to create ...
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57 views

BROUTING's target “redirect” in ebtables behaving in a strange way

Situation (host A)-------(bridge B)------(host C) where: A has MAC A on it's interface C has MAC C on it's interface B has MAC BA and MAC BC on it's two interfaces (depending on who it's facing) ...
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123 views

How does ssh work when client and host are on the same machine?

I illustrate my question with the help of docker containers but this example is orthogonal to the rest of the problem. In fact any program that allows the use of bridge interfaces and ssh would do. I ...
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72 views

Bridge in Debian Linux (Wheezy) cannot access WAN hosts by name

I'm having the same problem as this poster: bridging two network interfaces in ubuntu linux 12.10 AND being able to access it from that machine and would be grateful for any help on how to debug it. ...
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34 views

Linux virtual bridge not transparent

I'm attempting to set up the Openstack tutorial demo using libvirt VMs on my desktop but I'm having some problems with the virtual bridge on the host desktop. While debugging this, I noticed that the ...
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141 views

Launch an openstack instance with single NIC

I'm totally new to openstack and without much resources I built a cloud with my pc as controller containing a wifi for internet and ethernet for internal connection also with my laptop again with a ...
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62 views

Linux router share internet between eth2 to eth3 [closed]

I am not a networking guy, so apologies in advance. I have a small Linux (Ubuntu) box with 2 ethernet ports. eth2 is connected to a cable modem that gives it a 192.168.1.x address + internet ...
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382 views

CoreOS, Docker networking, more than one bridge?

I have a server with 4 ethernet-cards. With the switching hardware I put all 4 cards in different VLANs. With the default networking on CoreOS I get single bridge for the containers, with a private IP ...
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142 views

No IPv6 traffic in bridge mode

Hello happy people o/~ yesterday I had the audacity to reboot a remote Linux server. This Ubuntu 64, 12.04 installation went from kernel 3.11.0-19-generic to 3.13.0-32-generic and also from being ...
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52 views

How can I bridge a VM to a remote network?

I have a system running QEMU/KVM (via libvirt). One of its VMs needs to have a presence on a subnet that is not local to the VM host. I have a Linux system on the remote subnet. Is there a way to ...
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71 views

Directed ARP requests do not arrive at bridge interface

I'm baffled by the following weird bridge/arp behavior under Linux. It somehow seems to filter directed ARP requests, whereas it should forward them to the other end of the bridge. To test, I run the ...
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xen project - bridged interface shows 2 MACs

I have a simple xen project 4.1 setup running on debian wheezy dom0. I have noticed during a network scan that a domU gateway returned 2 mac addresses for the same IP. One MAC being the expected, ...
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174 views

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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1answer
97 views

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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37 views

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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461 views

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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13 views

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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89 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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94 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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1answer
91 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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370 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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44 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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1answer
30 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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1k views

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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1answer
113 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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349 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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253 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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223 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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58 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 ...