Hi all,

I'm using two Virtual Machines to create an ns3 emulated network. I'm trying to integrate an external node (VM) in a simulated environement with a scenario like in the link https://www.nsnam.org/docs/release/3.../html/tap.html

I have ns3 installed and working in a VM and I created a tap and bridge:

sudo brctl addbr br-left
sudo tunctl -t tap-left
sudo ifconfig tap-left 0.0.0.0 promisc up
sudo brctl addif br-left tap-left
sudo ifconfig br-left up

I can ping a simulated node locally like in the link https://www.nsnam.org/doxygen/tap-wi...cc_source.html

The problem I'm facing connecting the other virtual machine to the simulator, I don't really know how to connect the VM to the TAP cereated in the simulation machine.

Thanks in advance

Hi,

You can add a vm interface to the brigde:

Brctl addif bridge-left eth0

Then you can configure vbox to bridge that adaptor to a physical interface in the gui.

Hmm, maybe I misunderstood your question,

In case you have only one linux box, and are running ns-vm's, your question is how to tie a ns-application to a tap interface.
In that case, forget the last post. You then have to somehow configure it indeed. The doc you specified seems to indicate that you can pass this along?

./waf --run "tap-wifi-dumbbell --mode=UseBridge --tapName=mytap2"

I'm not familiar with ns unfortunately, so won't be able to help you further there.

First thanks for reply. I have two virtual machines and I'm using vmware:
VM 1 <external host> <===> VM 2 <bridge> <tap device> <ns-3>

What I wanted to know is how to connect the eth0 of the VM1 to the bridge I created in VM2. Or this will be done by configuring the VMware workstation ??

Hmm, what exactly do you mean with external host? Is it a different physical machine, or just two VM's on one machine?

What do you want to communicate with in ns3? A linux stack? Or another ns3? or the internet?

I'm going assume now:

- You have one physical machine running 2 vmware boxes
- You want to communicate with the linux stack on one with ns3 on the other

In that case,

- On vm2: Brctl addif bridge-left eth0
- In vmware: configure a connection between network adaptor 1 in VM1 to network adaptor in VM2
- On vm1: configure an ip address on its eth0, and try and ping ns3 or something.

Hope it helps

Thank you verry much arre for the clue, I figured it out. And yes I was using 2 Virtual machines, by "external host" i meant "external node" to ns3. I added eth1 in VM2 to the bridge and I created in Vmware virtual network (host-Only) and connect the two VMs to it, and I can go inside ns3.

But I'm still confused, because I'm trying another scenario with 2 Virtual Machines and ns3 installed in a 3rd VM as a channel, (like in this tutorial but with Virtual Machines instead of lxc).

https://www.nsnam.org/wiki/index.php...rtual_networks

VM1<Centos Linux> <===> VM2<ns3> <==> VM3<Centos Linux>

So how can I configure it ? I can't add eth1 (from VM2) to two bridges (left & right) in the same time! can I create another ethernet adapter, eth2 for example and add it to the other bridge ?

Hope you get what I trying to do, thanks in advance.