Create a test network for multi-divert

This script creates 4 virtual machines (client, server, PTS, divert host) and wires them on a common control bus. The client and server are wired together through the data interface of the PTS. The divert host is wired to the divert port, and, is setup so that multi-divert works. In particular, the PTS port is set to trunking (so VLAN tags are maintained). And, the divert host is wired with two interfaces, on vlan 100, 200, to that same interface.

 ----------------------------------------------[control]
  |     |                |               |
  |     |(1)             |(1)            |(1)
  |  --------         -------         --------
  |  |      |(2)   (3)|     |(4)   (2)|      |
  |  |client|---------| PTS |---------|server|
  |  |      |         |     |         |      |
  |  --------         -------         --------
  |                      |(2,trunk)
  |                      |
  |                    [ovs]
  |                      |
  |                    -----
  |            (2-v100)|  |(3-v200)
  |                  ---------
  |               (1)|       |
  -------------------|divert |
                     |       |
                     ---------

Usage

run 'install' (it wipes out and reinstalls fresh)

On the divert host, install:

$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp

auto divert
iface divert inet manual
  pre-up brctl addbr divert
  pre-up brctl addif divert eth1 eth2
  pre-up ip link set eth1 up
  pre-up ip link set eth2 up
  pre-up brctl stp divert off
  post-down brctl delif divert eth1 eth2
  post-down brctl delbr divert

$ sudo ifup -v divert

On the server, install:

Add this to /etc/network/interfaces:

auto eth1
iface eth1 inet static
  address 10.0.0.1
  netmask 255.255.255.0

then run 'ifup -v eth1'

$ cat /etc/init/http-daemon.conf
description "simple http-daemon"

start on runlevel [2345]
stop on runlevel [!2345]

respawn

exec /usr/bin/python -m SimpleHTTPServer

On the client, add this to /etc/network/interfaces, then ifup -v eth1

auto eth1
iface eth1 inet static
  address 10.0.0.2
  netmask 255.255.255.0

Now the client can ping 10.0.0.1, and run curl -k http://10.0.0.1:8000 to generate a simple http flow.

The divert host bridge should make the full traffic flow. When you are ready, remove that bridge and replace it with your application.

There is nothing special in the 'trusty.qcow2' or 'pts.qcow2' image that the script uses.