# IPv6-Lab

## Initial situation

In this project, a laboratory for IPv6 will be set up using a desktop computer with a current Debian system. To use the computer furthermore for its actual purpose, this should be done as far as possible without stirring up a lot of dust (e.g. using various outdated network backends).

OS: Debian GNU/Linux 12  
Kernel: 6.1.0-18-amd64  
Network backend: NetworkManager  
Hypervisor: KVM  
Virtual switch: Open vSwitch 3.1.0 

## Required packages

- openvswitch-switch
- gvncviewer

## Network topology
![Network topology](img/lab2.png)

### Configuring Systems
## Bridge br0

The bridge is part of the host system. Thus, it is configured using the network manager command line tool. These settings will be permanent.

Info about current connetions

    # nmcli con show

Add bridge

    # nmcli con add type bridge ifname labBridge0

Add interface to the bridge

    # nmcli con add type bridge-slave ifname wlp4s0 master labBridge0

Turn on the bridge

    # nmcli con up bridge-labBridge0

## Hypervisor

KVM is used as a hypervisor in this project. You may use virsh on the cli or virt-manager as a graphical tool.

### Create virtual networks on hypervisor

Here we create two networks on the hypervisor. The first is used by the edge router impala to connect to the host network, the second is needed by the hosts in the lab network. Create a file named bridged-network.xml with the following content
   
    <network>
        <name>bridged-network</name>
        <forward mode="bridge" />
        <bridge name="br0" />
    </network>

Then we need the network for the virtual switch served by openvswitch. Create a file named ovs-network.xml with this content

    <network>
      <name>vSwitch0</name>
      <forward mode="bridge"/>
      <bridge name="labbr1"/>
      <virtualport type='openvswitch'/>
    </network>

In case you use virsh, you need to run the following commands to create the network on the hypervisor:

    $ virsh net-define bridged-network.xml
    $ virsh net-define ovs-network.xml
    
Then start it

    $ virsh net-start bridged-network
    $ virsh net-start vSwitch0
    $ virsh net-autostart bridged-network
    $ virsh net-autostart vSwitch0
    $ virsh net-list
     Name              Status   Automatischer Start   Bleibend
    ------------------------------------------------------------
     bridged-network   Aktiv    ja                    ja
     vSwitch0          Aktiv    ja                    ja

On the hosts torino, we need just one interface connected to vSwitch0.

    <interface type="bridge">
      <source network="vSwitch0" portid="672dad49-ab32-4369-81d3-4a1e7e69b0de" bridge="labbr1"/>
      <virtualport type="openvswitch"/>
      <model type="virtio"/>
    </interface>

## Torino

Torino is the WAN router of the lab. On the external interface torino acts as a DHCPv6 client in order to receive a Prefix Delegation from the DSL-Router (Fritz!Box in this case). On the internal interface torino will serve Router Advertisements which is necessary for SLAAC. The hosts in the lab environment connectetd to the vSwitch will receive a prefix via SLAAC this way.

### DHCP Client

The dhcpcd package has to be installed on the OpenBSD system. 

    # pkg_add dhcpcd
    # rcctl enable dhcpcd

Edit the config file /etc/dhcpcd.conf

    ipv6only
    noipv6rs
    
    script ""
    
    allowinterfaces vio0 vio1
    interface vio0
      ipv6rs
      ia_pd 1 vio1/1