Questions about configuring and using bridging interfaces

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Sniffer: Request ARP

I need your help. How can I detect if there are several ARP REQUEST coming from the same machine "sniffer" in my local network, I need a source code example in python and not tools. thanks,
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28 views

KVM: Multiple bridges over single NIC

In my KVM host (Ubuntu 14.04 LTS) I want to setup one private network for the guests with static IP and internet access. Host is on a remote machine. I've the following configuration in the ...
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16 views

Is there any way to force an inteface to ignore carrier detection to stay up?

br0 has eth13 and eth0 ensalved to it eth0 is up eht13 is down /opt# ip link show br0 25: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default ...
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30 views

How does the Linux bridge works when a tap interface is connected

Assume the following scenario: brctl addbr BR0 tunctl -t tap0 brctl addif BRO tap0 brctl addif BRO eth13 ifconfig eth13 promisc up ifconfig tap0 promisc up ifconfig BR0 up Eth13 is connected ...
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1answer
117 views

KVM - Create a virtual machine with 2 bridges interfaces

Can someone please let me know to create a VM using KVM with 2 bridged interfaces. I have a server that has Eth0 and Eth1 configured and connects to 2 separate networks, I'd like to create a VM within ...
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1answer
40 views

How to connect to two VPNs at the same time?

At my university, I have to connect to the local VPN in order to be able to connect to the Internet, at the same time, I want to connect to another VPN. What should I do?
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1answer
149 views

OpenVpn bridge problem - Server behind NAT - Client can ping server, default GW but nothing else

first of all, yes I have been searching.. The issue is with setting up OpenVPN in bridged mode on ubuntu Server 12.04. It generally works, I can connect, I get an IP and can ping the OpenVPN server ...
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1answer
20 views

Can see all computers on the networks but can't see each other

I have a windows 7 pro machine (KC-Laptop1) running a bridged network between the wireless corp.local and my wired KC_Computers_LLC.lan and I have my ubuntu 12.04 server (KC-Server1) running on the ...
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35 views

VirtualBox networking can be enabled only via recovery mode

I've installed ubuntu server with minimal system without network connection (disable network adapter) in VirtualBox, because my connection is so slow and it's take forever to install with network ...
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1answer
47 views

Long boot time due to “waiting for network configuration” - but network is configured statically

My system has a statically configured network that is fully functional. However, booting needs a long time due to "Waiting for network configuration" messsages. What can be the cause for this? I ...
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1answer
41 views

Looking for network surveillance tool

I sometimes use / test software that cannot be found in the apt tree. The software comes from all over the internet. When executing the software I create an extra user for this particular software and ...
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57 views

Bridging two networks: access to bridge slow and unreliable

I have a LAN that connects local computers, and in addition I have a dedicated connection to an overseas network with a static IP address assigned for my use. An ubuntu (14.04.01LTS) box with two ...
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47 views

Pass LLDP frames through a bridge instead of consuming them

In Ubuntu 14.04, is it possible to pass LLDP frames through a bridge instead of consuming them? I know that technically, this is against the IEEE LLDP spec, but I still want to do it. For example, ...
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0answers
73 views

Correct way to create VLAN and Bridges on Ubuntu14.04?

When I tried to create VLANs and Bridges on Ubuntu 14.04 as following, network connection is always lost on it, what's the problem? Note that the if I only set em1(no em1.100, cloudbr0 and cloudbr1) ...
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22 views

setting up slip interface

I have FTDI serial converter device connected to the usb port of my machine , I want to create a slip interface between the serial device and the virtual network interface (something like tunslip). I ...
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80 views

bridge interface br0 for virt-manager removing IP from em1

I am trying to create a bridge interface for virt-manager to boot PXE images from network. My actual network in em1 (I don't have an eth0 iface). em1 have 172.16.20.x IP. I prefer the bridge IP to be ...
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180 views

Unable to Bridge wlan0 to Win7 guest with U14.04 host on Virtualbox

I am following the simple guide here, but am unable to bridge my wireless adapter and connect in Virtualbox. My host is Ubuntu 14.04, guest is Windows 7, and I am using VirtualBox 4.3.10 (latest ...
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1answer
35 views

connect to a virtual machine remotely

I create a server in my virtual machine in ubuntu. But I can connect to it only from my machine. I can not connect to my virtual machine from outside computer which was in same LAN. When I search ...
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253 views

bridge vs iptables vs route?

iptables vs bridge-utils vs route I have two network cards in a Linux server and don't know how to make them communicate. After searching a lot I still don't know which method is the one that should ...
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1answer
1k views

Ubuntu 14.04 wireless network setup

I am trying to setup kvm on my laptop. These are the steps I have done so far. Uninstalled existing windows7 and installed Ubuntu 14.04 on the laptop. I have a network which provides me wireless ...
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1answer
38 views

isc-dhcp for Virtual Machines only

I installed Xen 4.3 on Ubuntu Server 14.04 and added the xenbr0 bridge. The host IP is 145.173.136.2. The network administrator reserved 15 IP's for the VMs: 145.173.136.112-126 So i installed the ...
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2answers
394 views

Ubuntu 14.04 Server operated as a WIFI-LAN-Router drops packets between LAN and WIFI

I would like beeing able to exchange packets between WIFI and LAN. My Ubuntu 14.04 Server operated as a lan-wifi-router has two physical Ethernet Ports (p4p1 and p5p1) as well as a WIFI Module ...
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806 views

LXC container no outgoing traffic with bridged network and public IP address

I try to setup a LXC container with bridged network on ubuntu 14.04.1, but the outgoing traffic seems to be blocked. Ping another IP than the container's one is not working. Actually I tried this with ...
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74 views

Why must write 'br0' in route table to restore host's Internet connection?(with QEMU & Tap)

That's a long story.... But at first, I have to confess that my reputation is less than 15 so I can't give you a '+1'. I need to set up several QEMU instances. One of them is a primary node, which ...
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1k views

network-manager, bridge and vpn

I have a shiny new system with Ubuntu 14.04 and I'm trying to get something configured which I think is reasonably simple: a bridge (br0) for KVM ability to use a VPN network-manager controlling it ...
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97 views

Bridged VM guest does not get IPv6 ra prefix from host

I have a similar problem and setup as described in IPv6 does not work over bridge. My host get a IPv6 prefix but the guest VM only gets a local fe80-prefix. Using tcpdump I can see that solicit ...
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1answer
385 views

Multiple interface devices for KVM bridging

I have a server that I'm trying to virtualize with KVM. I'm trying to use a network bridge so that my KVM guests can have external IPs. Every time I create a bridge brctl addbr br0 brctl addif br0 ...
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1answer
160 views

iSCSI + br0 bridge + 14.04.1 Server = does not work

On one of my servers I have: USB 4GB: 1) EFI partition 2) /boot partition iSCSI 50GB (on another fileserver): 3) / partition In /etc/network/interfaces it works flawlessly if I have: auto p3p1 ...
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154 views

Layer 2 Bridge with Tap Interface

Linux newb starting out. Figuring it all out as I go along. Im trying to layer 2 bridge a virtual tap interface and an etehrnet interface. want to achieve this. Tap0 10.0.0.3/8 =====> Br0 (Layer 2 ...
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19 views

Can we add ports to OVS AFTER the VM is created?

I wanted to write up a program where I can create VMs first using libvirt. Initially they would not be added to any network. Then I want them to be attached to an OVS bridge where I can specify the ...
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1answer
98 views

Network Bridge Over a Subnet

I am trying to figure out how to make a flat network by bridging over a subnet using 2 Ubuntu guests so that everything in the other subnets can talk to each other without restriction. Configuration ...
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146 views

ubuntu vm on open nebula doesn't se internet connection

I have some problem with ubuntu and open nebula. I'm trying to setup one installation of ubuntu on open nebula. Start from this assumption: my machine as an i7 with 16 GB of ram and runs ubuntu ...
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1answer
85 views

Link aggregation on a LXC bridge

I'm working on a server with a number of various interfaces (eth0-3) and I currently just use one for both host traffic and another for my LXC bridges traffic. Since I have a few spare ports just ...
2
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0answers
494 views

Ubuntu 14.04: with bridge on wlan, no internet on kvm guests

I'm trying to be a "high-lander" sticking to KVM plus virt-manager to manage my VMs. But it's about a week I'm around trying to create a bridge that works for using with my VMs. I tried first tried ...
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126 views

LXC bridging with two NICs

I am setting up a server to host a number of LXC containers, for now just isolating web and db services. The server I am using has two NICs and I'd like to use one for host traffic and one for ...
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114 views

url_helper.py warning cannot route to host. Ubuntu Server

When booting a Node Via PXE i keep getting url_helper.py[warning] saying it cant route to host, My Master Node/Controller has 2 interfaces. 1 for nodes, 2 internet access. What can i do to allow the ...
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1answer
47 views

Two network interfaces use for up and down

I've setup Ubuntu Server 14.04 as a virtual machine using vSphere. When I created the machine I set it up with 2 network cards. Is it possible to set one as a download interface and another as ...
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209 views

No internet access through bridged wireless connection in VirtualBox

I have Windows 7 installed in VirtualBox on Ubuntu 14.04. This is on a laptop so I have to networking adapters. The ethernet adapter works fine regardless of connection type. Wireless only works in ...
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51 views

Adding static MAC entry to a bridge

Is there a way to add a static MAC entry in a linux bridge against a certain port X? i.e. I know that the MAC in question resides behind port X and it will not be learnt for a while (assuming unidir ...
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15 views

netfilter's function nfq_get_outdev_name()

I'm trying to figure out what the interface of a packet is using Netfilter linux library on Ubuntu 12.04. One of my interfaces is a LAN (eth0), and the other one is connected to a router (that I've ...
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2k views

Creating bridge from wlan to ethernet

I know there is lot of threads about bridges and how to make them and manage them but still i haven't reached a goal. So i need bridge between wlan and ethernet but mean while i need connect to ...
0
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1answer
177 views

Setting up VMs on different subnets

I run a server on IP X.Y.3.7 and i want to run multiple VMs on it using libvirt. I set up a bridge device: auto eth0 iface eth0 inet manual auto br0 iface br0 inet static address X.Y.3.7 ...
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24 views

Trill for Ubuntu

I have a project on testing trill but I do not have the equipement that supports it (like Cisco Nexus) so I was wondering if there is an opensource version that I could install on Ubuntu. I found ...
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1answer
164 views

A question about the Internet/ConnectionSharing (NAT) via iptables

I'm following this tutorial to setup a NAT gateway: https://help.ubuntu.com/community/Internet/ConnectionSharing#Ubuntu_Internet_Gateway_Method_.28iptables.29 With simple eth0 as WAN and eth1 as LAN ...
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2answers
1k views

IPv6 does not work over bridge

I installed Ubuntu 14.04 server a week ago. I use it as a virtual machine host (tasksel installed). meaning am running it with kvm + libvirt. I have set up the same bridge I had in 13.10. auto p4p1 ...
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1answer
4k views

VirtualBox - How to connect LAN computers to Windows XP Guest

I have software in a Windows XP Guest that acts as a server. I need to have my LAN computers connect to it. Is the best way to use a bridged connection? Is there another way? I've tried setting up a ...
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35 views

Showing Unmanaged in network ICON even i have a working internet and local net

I have installed Ubuntu 12.04, I have assigned a Manual IP Address for my Host using Bridge, I'm using KVM so i have to use Bridge for assigning same network range for Virtual machines, Now the issue ...
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1answer
141 views

Bridge Ethernet and Firewire

I'm trying to connection between my eth0 and firewire0 interfaces on an Ubuntu 12.04 server. I tried using brctrl, but it apparently doesn't support firewire: samuelwn@master:~$ sudo brctl addif br0 ...
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3answers
470 views

Create “virtual” LAN on laptop (not VLAN)

I'm running a number of virtual machines on a Ubuntu 12.04 host. For various reasons all these VMs need fixed IP addresses. The laptop in question is used for demonstrations -- and this is where the ...
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22 views

Using server as controlled switch

I have an Ubuntu server with 3 NICs installed. I have two classrooms. I want to control the two classrooms with IPtables separately. My problem is that I can't (bridge eth0 to eth1) and (bridge eth0 ...