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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Network bridging - what's the point?

I'm having hard time trying to understand how bridges work. What's the idea behind them? Most sources say their main role as connecting two LANs. They are layer two devices. But wait a second, how can ...
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3answers
1k 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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290 views

CentOS 6.6 - Additional public IP through aliasing in VM with bridged network

The scenario: A CentOS 6.6 virtual machine with a working public IP assigned to its eth0 via bridged networking (details about the setup below). The problem: I would like to add an additional public ...
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60 views

Bridging two datacenters

i need to find out what would be best way to bridge current datecenter with new DR datacenter. I have following network configuration (show in picture). http://i.imgur.com/7bohb3I.jpg So on internal ...
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6answers
10k views

ARP replies contain wrong MAC address

I've got a robot running linux with wired and wireless adapters. When I boot up, it connects to the wireless fine. When I assign an IP to the wired (either statically or with DHCP), it looks like it ...
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0answers
57 views

Cisco vpn access to another router

I am using a Cisco ASA 5505 to VPN into my network (which is working great), and I want to connect to a different network that is on a Asus RT-N66v. For example: network 10.1.1.1 is my VPN and ...
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2answers
589 views

Network-Manager with bridge interface and OpenVPN

I'm running Debian Wheezy with Gnome-Shell. My current network interface configuration is this: # The loopback network interface auto lo iface lo inet loopback # The primary network interface ...
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1answer
181 views

ubuntu route all client eth0 traffic to openvpn on client tun0

OpenVPN client has 2 physical interfaces: eth0 = 192.168.10.14/24 gw 192.168.10.1 eth1 = 192.168.10.17/24 gw 192.168.10.1 tun0 = 172.160.1.6/24 gw 172.16.1.5 Server is external somewhere listening ...
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1answer
240 views

How can I block all traffic to/from an bridged interface while allowing DHCP?

I have a PC (running Fedora 20) that is being used as a "software switch" to control the network connectivity of some external devices. There are eight such devices; the PC has two 4-port Ethernet ...
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1answer
4k views

Centos/OVH: public IP on KVM virtual machine

Since a few days, I'm trying to configure my KVM vm to have a public IP address, without any success. First, I'm on OVH, and you need to know they don't allow networking from different mac addresses. ...
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1answer
1k views

Proxmox with an Openvswitch bridge

All, I'm trying create a way for me to be able to use the local network within my Proxmox infrastructure. Currently, everything is running off of NAT from wlan0 and all internal machines have the ...
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1answer
92 views

how to make this bridge to work?

I have posted a similar question at: http://stackoverflow.com/questions/27873819/customising-docker-network-doesnt-work# To simplify the question, let me get rid of docker. This is the network ...
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0answers
110 views

nftables, bridge, lxc. Can't call into container

My first post so bear with me. I am using nftables to start to replace old ones. I am loving it, but obviously, my approach is a bit iptables-like and also highly procedural, rather than using the ...
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1answer
17 views

Bridge behavior when MAC address is not found

Lets say, a uni-cast packet is sent from one system to another system. The packet passes goes to the bridge. But the bridge does not have any information about the MAC address of the destination. What ...
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0answers
60 views

Bridge configuration on OpenVZ

I have been using an OpenVZ environment left behind by a previous employee. A while ago I needed to use virtual eth devices to try a specific application. After removing VETH might have misconfigured ...
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1answer
450 views

NIC bonding over bridged GRE-TAP: not getting replies… unless I run “tcpdump”?

I'm trying to get Linux bonding working over a VPN (GRE-TAP). The funny thing is, that it only works when I have tcpdump running on both hosts, but more on that later... There are two machines, ...
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0answers
124 views

Linux bridge not answering arp packets

I'm trying to setup a test scenario regarding linux bridges for which I need a full virtual IP stack. Basically, I'd like to simulate the network between a VM (or container) and its host, just without ...
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0answers
79 views

LXC Container with public IPv6 network

I have a setup where I wanna be able to access a LXC Container by there public IPv6 Address from public. At the moment I'm getting stuck while trying to access any other net than the network provided ...
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1answer
226 views

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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1answer
299 views

Dummynet Filtering not working on FreeBSD 10

I am trying to do network emulation using dummynet in FreeBSD 10. I have this working in 9.3 however things must have changed and I cant determine exactly what but my setup no longer works. I have ...
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0answers
163 views

Equivalent to TYPE=“OVSPort” DEVICETYPE=“ovs” OVS_BRIDGE=br-ex in Ubuntu 14.04?

Is there an equivalent to TYPE="OVSPort" DEVICETYPE="ovs" OVS_BRIDGE=br-ex in Ubuntu 14.04? The system is OpenStack Icehouse with 3 nodes (controller, network, compute1) each on a VirtualBox Ubuntu ...
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1answer
96 views

Sniffing packets coming out of “tap interface” when bridge connects to vlan tagged interface

So, I've a tap interface that's created by kvm which belongs to a VM being managed via libvirt. The bridge consists of eth0.123 (here eth0.123 is a vlan tagged interface) & the tap device. ...
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1answer
340 views

can't ssh into KVM VM despite using bridged network

I'm trying to access a KVM virtual machine running inside my company's network. I am VPN'ed into the network from my laptop and can ssh into other VMs, and I set up my VM to use a bridged network for ...
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53 views

Blindly bridging wireless client with MAC NAT

This is the usual "I want to bridge wifi with ethernet" question, but I need something specific here. My Linux box has a wlan0 interface which is in station mode, with MAC aa:aa:aa:aa:aa:aa, and a ...
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1answer
175 views

qemu, kvm: Guest: No DHCPOFFERS received

I'm trying to set up a virtual machine (guest) wich should act as router (ubntu 14.04). The host is a CentOS 7 machine (4x LAN). The guest should get a public ip address over it's eth0 (guest), wich ...
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2answers
2k views

KVM guests lose connectivity after networking restart

we're setting up an ubuntu server 10.04 host with kvm. The host is setup with a bond and bridged interfaces to allow the guests access to the network without natting. Our current configuration is ...
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1answer
116 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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1answer
409 views

How do bridges really work?

I'm in a major confusion here, regarding bridges. I thought that they were devices that allowed going from one network to a different one without routing (doing the work at layer 2 instead), but if ...
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2answers
292 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 ...
2
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1answer
1k 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 ...
2
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1answer
413 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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0answers
57 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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31 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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0answers
74 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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46 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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33 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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148 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
113 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
59 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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1answer
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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1answer
616 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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0answers
75 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
79 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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70 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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2answers
831 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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1answer
586 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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1answer
405 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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0answers
7 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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0answers
37 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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1answer
324 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 ...