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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How to test ebtables/ping between 2 bridged VLANs? [on hold]

I defined two VLANs: eth1.2 and eth1.3. I added them both to a bridge I created: br0. Now I want to 'play' with them using ebtables. I want to set some routing rules. My question is how can I test ...
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9 views

How to use iptables and ebtables to limit qemu access to a set of IPs? [on hold]

I want to limit the access of a VM (backed by QEMU) to a few IP address. The VM has a private IP received from dnsmasq. The guest is connected to outside through a bridge. To limit the access, I need ...
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29 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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19 views

assigning static IP when using bridge adapter

We have a physical server( with static IP address eg: 43.xx.144.102) that is hosting a virtual server created using virtualbox, and is configured with bridge adapter. The virtual server is ...
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1answer
65 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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20 views

Networking issue (CentOS) - 2x Bridged networks

I've got an issue with a bridged network on CentOS machines. Basically, the setup at present: 2x Firewalls 2x internal networks (10.0.1.0/24 - Private, 10.0.10.0/24 - DMZ) 4x Virtual Hosts host1 ...
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29 views

packet is not being forwarded from tap interface to bridge

I am running fedora 19 on a virtual machine and have two tap interfaces (A, B) created. I'd like to be able to send packet from A to B. I am trying to do this using a bridge, however with the bridge ...
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14 views

Persistent promiscuous bridge interface

In an effort to try and clean up the office network I've mirrored the uplink port on our switch, plugged it into a spare port on our VM server, and set up an VM with ntop. All this works, however we ...
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9 views

allow double tagging on vlan interface

I have a single interface eth0 on my machine. I have a linux bridge to which If I add my interface I loose connectivity. So I create a vlan interface and add it to the bridge. All is fine now except ...
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19 views

global ip address packets don't pass from tap interface to the virtual machine

i have a config: p6p1(physical nic, connected to isp with no addr promisc) -> pppbr0 (bridge with no addr promisc) -> tap0 (with no addr promisc connected to a vm) iptables configured: iptables -A ...
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2answers
42 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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29 views

Guest-VM can only ping CentOS KVM host, cannot access anything else

[root@KVMHOST]# ifconfig br0 Link encap:Ethernet HWaddr 00:1E:67:6B:17:2F inet addr:200.200.100.54 Bcast:220.225.255.255 Mask:255.255.0.0 inet6 addr: fe80::21e:67ff:fe6b:172f/64 ...
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1answer
33 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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1answer
38 views

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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31 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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1answer
39 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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29 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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1answer
136 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 ...
0
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2answers
153 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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27 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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94 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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1answer
102 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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23 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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1answer
296 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
94 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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31 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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1answer
104 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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113 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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36 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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156 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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1answer
319 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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21 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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1answer
91 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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1answer
149 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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1answer
87 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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1answer
43 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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1answer
195 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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1answer
73 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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1answer
571 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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163 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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1answer
66 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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1answer
82 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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1answer
38 views

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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1answer
335 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
107 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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42 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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2answers
757 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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1answer
101 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 ...