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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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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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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1answer
485 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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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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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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86 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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50 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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37 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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164 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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133 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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76 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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2k views

ARP response is not present on the other port of linux bridge based on ubuntu 13.10

I recently build linux based bridge for packet monitoring purpose, but there is BIG problem. the environment is, overall env. target of monitoring is VMs on vSphere. two vSwitches are configured ...
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663 views

Xen: can't get Dom0 and the DomUs to ping eachother

We have installed a Xen (4.1) configuration and can't get Dom0 and the DomUs to communicate (ping eachother). The DomUs are able to ping eachother but not Dom0, and Dom0 cannot ping the DomUs. We ...
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83 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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86 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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81 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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628 views

Xen guest - cannot get network connection beyond the host

I've just installed a XenServer 6.1. It came with a standard configuration, network 0 connected to NIC 0. I created a VM but I can't reach any network beyond the host. From the VM (172.18.32.20), I ...
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493 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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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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38 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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396 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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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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1answer
342 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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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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68 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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200 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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1answer
461 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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783 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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214 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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2answers
692 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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106 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

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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3k 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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51 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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376 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
923 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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1answer
241 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
160 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
57 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
220 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
88 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
608 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
119 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
2k views

linux container bridge filters ARP reply

I am using kernel 3.0, and I have configured a linux container that is bridged to a tap interface in my host computer. This is the bridge configuration: :~$ brctl show bridge-1 bridge name ...
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Centos KVM Host OS not passing all network traffic Guest OS

I'm running KVM on Centos 5. I have a guest OS, ubuntu 10.04, that has Snort 2.9 installed on it. The guest OS has (2) nic's, eth0 and eth1. One nic, eth0, is configured with an IP and can be ...
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180 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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2answers
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When I restart my LXC environment, the container does not re-bind to the IP address

The IP does no longer respond to a remote ping With restart I mean: lxc-stop -n vm3 lxc-start -n vm3 -f /etc/lxc/vm3.conf -d -- /etc/network/interfaces auto lo iface lo inet loopback up route ...
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MAC address table in Windows

How can I see the MAC address table of a Windows network bridge? Is it possible trough command line to find this information? EDIT: I am interested to see the same table that it is possible to see in ...
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1answer
784 views

Can a virtual mikrotik box bridge a hyper-v internal network with a hyper-v external network?

I am trying to set up a Mikrotik router as a transparent firewall on my network. I got the machine working on a hardware MT box, but my boss wants the MT virtualized. I have been trying the set up ...
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1answer
216 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 ...