Tagged Questions

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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330 views

Access router set up as a bridge behind another router

I have a problem my ISP is refusing to help me with, even though they put up the whole system. Specifications: There's a Thomson TG784 router through which the internet comes in to the building, ...
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53 views

Make access to VPN via another host in local network

My network structure: -------------- -------------- | WINDOWS | | LINUX | | VPN ACCESS | | NO VPN | -------------- -------------- | ...
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1answer
170 views

Setup IPv4 local on IPv6 VPS

I have a dedicated server running multiple IPv6 only OpenVZ containers. I want them to be able to communicate with the IPv4 internet, but I realized that isn't going to be possible with IPv6 only. So ...
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1answer
82 views

OpenVPN: Single certificate authority, multiple VPNs

The company in which I work has a single site (I'll refer it as "Site A"). There are several private networks within site A. We have a running instance of OpenVPN which allows some employees to ...
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1answer
604 views

LXC container can only access host via bridge

I have an LXC container with i686 Ubuntu 12.04 running on a x86_64 Ubuntu 12.04 host. I've set up a bridge using instructions here. However the ping from the container only goes through to the host ...
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1answer
922 views

How to setup IP alias on bridged interface in Ubuntu

How do I setup an IP alias on a bridge (br0) device on Ubuntu ? If I wait for br0 to come up and then do /sbin/ifconfig br0:0 192.168.10.1 netmask 255.255.255.0 then it works fine. If however ...
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1answer
451 views

Xen dom0 bridge interface drops a lot of RX packets?

I'm running Gentoo Hardened as Dom0. It also acts as a router/NAT. There's a bridge interface called br0 which contains a pci-e wlan card, ethernet nic & domU. bridge name bridge id ...
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1answer
439 views

Mirror network packets from WiFi to Ethernet in an ASUS Router RT N53

I have an ASUS RT N53 router, running the default firmware (Linux 2.6.22 with busybox and uclibc). I need to capture data packets from some Wi-Fi devices I have connected to that router (iPad and some ...
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2answers
153 views

How to capture arp table when using network bridging?

I have a computer with 2 NICS that are bridged and I need a means of distinguishing between machines connected to eth0 from machines connected to eth1. I was hoping to use something like the "arp -a" ...
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2answers
370 views

Setting Up Xen and Network Bridge on Debian 7

Setting up Xen and Network Bridges on Debian 7 Hi there. So i am finally going to try out some virtualisation on my new dedicated machine, however i am having some problems / confusion on setting it ...
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1answer
3k views

Multiple, different VLAN trunks to KVM guests (Linux)

I've hit a roadblock of sorts with an architectural challenge. I've got a server running KVM - which will feature a number of guests, some running virtualised firewalls and others, just plain web ...
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2answers
158 views

IP Alias and port bridging

The situation is that I have an Ubuntu box with multiple ethernet ports, which I'd like to behave as if connected to the computer through a switch. I can achieve this easily with a bridge. In ...
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1answer
894 views

tap interfaces always disabled in linux bridge

I have a physical interface eth0, and I want to create two virtual interfaces and bridge them with eth0. For this purpose I do: #Create the virtual interfaces tunctl -t tap0 tunctl -t tap1 ifconfig ...
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1answer
218 views

Filter broadcast traffic in a bridge port

I have a linux bridge with three interfaces, e.g. tap0, tap1 and tap2. What I would like to do is to modify the standard bridge behavior in the following way: If a L2 broadcast is originated from ...
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2answers
394 views

Blocking STP Traffic

I am using Xen virtualization with a bridged mode netwrk. I noticed that there is a lot of spanning tree (as understand) traffic coming from a network. Such as: STP 802.1d, Config, Flags [none], ...
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1answer
133 views

libvirtd - Getting vps to use existing bridge

I've been working on getting KVM running on CentOS 6.4 and ran into a snag. After pouring through several online docs about setting up a bridge for the vps to connect to, and manually attempting to ...
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0answers
378 views

Networking with lxc containers with local dhcp and external ipv6 double bridge problems

I want to use both ipv6 externally on all my containers, and ipv4 external only on the hosts. I am using Ubuntu 12.04 64bit. For ipv4 on the container I use the DHCP that came with the lxc ...
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2answers
60 views

Bridge (?) that is doubly-connected to a network [duplicate]

Note: I think my question has a poor title but I am not sure how to fix it, so please correct if you think of something better. In my office our phones are equipped with a "daisy-chain" port so that ...
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2answers
509 views

bridge networking KVM

i am having a problem connecting VMs to the bridge interface. My VMs cannot connect to the host and LAN outside the host, when i ping it just say destination host unreachable. it seems that my VM is ...
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1answer
542 views

Xen dom0 not forwarding to domU over bridge

My setup is about as basic as you can get. I have 2 interfaces on dom0 (Debian Squeeze), eth0 and eth1. I created a bridge for eth1 to forward packets to domU that has a public IP address. I can ...
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0answers
498 views

Spanning Tree Operation when Bridging Networks on Windows Server 2008

I am connecting two cables from two switches to my Windows Server 2008 machine. The ports are configured as access ports on the switch ports and are in the same VLAN. I want to setup basic redundancy ...
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1answer
365 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
99 views

Ubuntu 12.04: KVM and assigning public IPs to VMs

I'm setting up an environment where I have a VM host running behind a NAT firewall and plan to install VMs with public IPs so that they can be directly accessed over the internet like in the following ...
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1answer
499 views

How to bridge Network interfaces on Debian/kFreeBSD

I have had problems finding a way to bridge network interfaces on Debian/kFreeBSD. My primary goal is to create 2 - 4 tap interfaces and bridge them with two physical Interfaces. The Syntax in ...
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1answer
789 views

how to make bridge networking with KVM work in Fedora19

I'm attempting to get several virtual machines setup on a Fedora-19 host system, with the traditional bridge network devices (br0, br1, etc). I've done this many times before with older versions of ...
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1answer
294 views

Layer 2 bridged networking issue with QEmu

I am having a problem with a layer 2 bridged network configuration using Linux, QEmu, and VMware ESX. The configuration works fine on a small isolated network, but once introduced into our large ...
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votes
1answer
436 views

New KVM guests cannot access outside LAN

I have a KVM host (at 192.168.0.10) that currently has one working KVM guest (at 192.168.0.12). On attempting to install a new KVM guest today, I reached a problem where the network on the new guest ...
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2answers
418 views

Why VM cannot get the public IP I have from provider?

I have a KVM-Host (on Debian) with root@kvm-host:/# cat /etc/network/interfaces auto eth0 iface eth0 inet manual auto vmbr0 iface vmbr0 inet static address 176.x.y.133 netmask 255.255.255.224 ...
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votes
1answer
833 views

Why are eth0 and vmbr0 (bridge) having the same MAC addresses?

I configured my Debian (with KVM on board) as following: /etc/network/interfaces: auto lo iface lo inet loopback auto eth0 iface eth0 inet manual auto vmbr0 iface vmbr0 inet static address ...
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1answer
336 views

How to configure a network on KVM using only public IPs?

I have a KVM server and two VMs. I have one main IP and two additional "single" IPs (not a subnet). I don't want have a local network with private addresses on my KVM, but I want to assign my public ...
2
votes
1answer
484 views

LXC container with bridge networking exposes fake MAC address to external network

I'm running LXC container (lxc 0.7.2-1) on Debian squeeze with bridge networking configured by the book with public IP and I have problem that it exposes fake MAC address from LXC container to ...
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2answers
2k views

IPv6: ADDRCONF(NETDEV_UP): eth2: link is not ready & IPv6: ADDRCONF(NETDEV_UP): xenbr2: link is not ready on Ubuntu Server - Xen bridge

Hi all, I am having some problems getting a Xen bridge up in Ubuntu precise with Xen. I created a first bridge on eth1 with no problems, but the exact same process for eth2 yields the following ...
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0answers
284 views

Bridging two wireless interfaces with brctl?

I have this topology: [internet] ^ L-------[wlan0]-[host]-[wlan1]-----[client-1] I tried to bridge wlan0 wlan1 but it wont work with brctl; but magically when I issue this command #iw ...
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0answers
332 views

Unable to ping gateway via bridge nic

I'm trying to install KVM on Ubuntu 12.04 server. We have multiple nic on this server of which we primarily use eth0. The server network runs fine(i'm able to ping gateway, ping dns server and ping ...
1
vote
1answer
1k 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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vote
2answers
252 views

Xen Networking - Separating Dom0 from DomU

I'm having some issues regarding Xen Networking and I was wondering if you could point me in the right direction. I have a server with 2 NICS (Xen over Ubuntu Server - Xen Bridge scripts) Each NIC ...
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2answers
334 views

How to 'bridge' the newly bonded NIC?

I bonded eth0, eth1, eth2 and eth3 of my server to create a single bond0 interface using the ifenslave package. Now I wish to create multiple Virtual machines on this server in order to set-up a ...
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0answers
272 views

After adding interface to a bridge, internet connection is down

I want to create a bridge on my Ubuntu machine, to build virtual OSs. I did: sudo brctl addbr br0 sudo brctl addif br0 eth0 sudo brctl stp br0 on sudo ifconfig br0 up dhclient br0 After sudo ...
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votes
2answers
467 views

Packets only get forwarded when tcpdump running on bridge

I ran into the oddest thing when trying to debug a networking issue with OpenStack. I was doing a ping test between virtual machines. The ICMP request packets only made it to the destination host if I ...
0
votes
1answer
130 views

KVM firewall to disallow internet access for group of guests

I've got a KVM server inside a local network (192.168.10.0/24). This server has three interfaces, which are all publicly bridged [1]. Atm I'm only using two of the three interfaces, so the virtual ...
0
votes
1answer
226 views

KVM Physical NIC access

I'm new to KVM. I have a host with 4 NICs. I want to set this up, is it possible? eth0+eth1= bond0 -> internal network build two guests each guest will have network access to 2 subnets ONLY eth2 -> ...
0
votes
1answer
81 views

How to bridge two lan but keeping their clients using/choosing their own wan?

this is my first question here so please bear with me if I haven't made it super clear So I have 2 piece of Cisco RV180W router hardware. The office is moderately big and one single Wifi router is ...
2
votes
1answer
230 views

Linux bridge static IP using only one NIC

It seems like I have a generic problem, but can't find any solution - every solution that I found so far on internets doesn't work for me. Let me first try to explain what I am trying to do - I have a ...
0
votes
1answer
274 views

DHCP server on bridged connection

I want to put DHCP server on Ubuntu server to listen on 10.0.0.1 (internal network). I also need to configure OpenVPN server on Ubuntu server (DHCP is going to lease addresses to OpenVPN clients), ...
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0answers
61 views

No HTTP connectivity in vbox guests with bridged network

I'm running Ubuntu 12.04 Server x86. Network connectivity is on eth2 for the host server (the 10ge card). I installed VirtualBox 4.2 using the downloadable deb package from VirtualBox's website. ...
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0answers
79 views

Why do I need to assign static ip address to the bridge and not to the physical interface? [duplicate]

I have bond0 with two physical interfaces in it. Normally I used to assign static IP address to this bond0 to set up internet connectivity on the server. Now, because of LXC virtual guests, I had to ...
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0answers
51 views

if there are 2 NIC on the same machine, can a tcp client on one NIC connect to a tcp server on the other NIC?

I use tun/tap to create a tun NIC tun0 with IP 10.10.10.2, and I have a real NIC eth0 with IP 202.112.34.49 then I run a tcp client which binds its socket to 202.112.34.49 and a tcp server binding ...
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1answer
41 views

bridge on openVPN client

I have some problem with setting up what i call a "remote entry point" (i'm sure ther is a real name for this) First things First : Here is my setup : ...
4
votes
1answer
317 views

Linux: How to simulate several IP- and MAC-Addresses for networktesting in one linux box

I want to test a network with one linux-box which should get 100 different IP-Addresses, each with an own MAC which should be used as source MAC-address when communicating to other devices. I've ...
2
votes
2answers
156 views

Bridged network connection not working on Ubuntu VM

I am in a corporate environment and there is 802.1x authentication set up which is using my windows credentials + domain to authenticate. Setting up that information for my connection in the VM only ...