Router workshop
This repo contains some files used for a router workshop we did in the local hacklab.
The setup uses 2 or 3 VM images, based on ArchLinux and:
- systemd-networkd for basic network setup (not required, but seemed easy)
- keepalived for vrrp redundancy
- bird for ospf, bfd, bgp, rip, etc…
You can see some config file examples in mkosi.extra/ which are copied verbatim in the VM image.
The setup uses the mkosi script from the systemd project. It's a simple tool to create a VM image. The image is then used as a qemu base image to instanciate several virtual machines.
A custom rooter.sh (mis-spelled intentionally) script can run several VM instances from the same base image.
You just need to provide an ID, a number from 1 to 254, from which the name, mac and ip addresses are constructed.
Routers have 2 interfaces each, and the second interfaces are bridged together through the host.
Prepare the host
Currently on ArchLinux as a host you need to install the mkosi-git from AUR and ovmf, arch-install-scripts (and
iproute2 for host setup) packages. For other hosts see the docs at mkosi.
LAN=eth0 # or enp0sXXXX
sudo ip link add name br0 type bridge
sudo ip link set $LAN master br0
sudo ip addr add dev br0 192.168.200.254/24
sudo ip link set up dev br0
To create the base image (rooter-base.img) just:
sudo mkosi
Then run several vms with:
./rooter.sh 1 # 2 or 3
each will create its own snapshot image rooter1.img, rooter2.img …
TODO
- better docs and diagrams
- vrfs
- bgp
- quagga and other routers interoperability
- option for volatile snapshots