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for its actual purpose, this should be done as far as possible without stirring up a lot of dust (e.g. using various outdated network backends).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

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 network on hypervisor

Here we create a new network to be used by the edge router torino by creating a new file named bridged-network.xml with the following content

<network>
    <name>bridged-network</name>
    <forward mode="bridge" />
    <bridge name="br0" />
</network>

To create the network on the hypervisor, run

$ virsh net-define bridged-network.xml

Then start it

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

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 re0
interface vio0
  ipv6rs
  ia_pd 1 re0/1