We deployed an openstack installation using JUJU, all the default configurations were used, and we're essentially using a flat network at the moment. When we boot an instance, (Cirros 0.3.0) we can see the following output in the log of the instance:

Apr 21 12:57:55 cirros kern.info kernel: [    1.130507] acpiphp: Slot [28] registered
Apr 21 12:57:55 cirros kern.info kernel: [    1.130520] acpiphp: Slot [29] registered
Apr 21 12:57:55 cirros kern.info kernel: [    1.130534] acpiphp: Slot [30] registered
Apr 21 12:57:55 cirros kern.info kernel: [    1.130550] acpiphp: Slot [31] registered
Apr 21 12:57:55 cirros kern.info kernel: [    1.133679] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
Apr 21 12:57:55 cirros kern.info kernel: [    1.133682] e1000: Copyright (c) 1999-2006 Intel Corporation.
Apr 21 12:57:55 cirros kern.info kernel: [    1.135678] ne2k-pci.c:v1.03 9/22/2003 D. Becker/P. Gortmaker
Apr 21 12:57:55 cirros kern.info kernel: [    1.137350] 8139cp: 8139cp: 10/100 PCI Ethernet driver v1.3 (Mar 22, 2004)
Apr 21 12:57:55 cirros kern.info kernel: [    1.139077] pcnet32: pcnet32.c:v1.35 21.Apr.2008 tsbogend@alpha.franken.de
Apr 21 12:57:55 cirros kern.info kernel: [    1.142400] ip_tables: (C) 2000-2006 Netfilter Core Team
Apr 21 12:57:55 cirros kern.info kernel: [    1.252120] Refined TSC clocksource calibration: 2000.004 MHz.
Apr 21 12:57:55 cirros kern.info kernel: [    1.676491] eth0: IPv6 duplicate address fe80::f816:3eff:fe7e:660e detected!
############ debug end   ##############
cloud-setup: failed to read iid from metadata. tried 30
WARN: /etc/rc3.d/S45-cloud-setup failed
Starting dropbear sshd: generating rsa key... generating dsa key... OK
===== cloud-final: system completely up in 138.14 seconds ====
wget: can't connect to remote host (169.254.169.254): No route to host
wget: can't connect to remote host (169.254.169.254): No route to host
wget: can't connect to remote host (169.254.169.254): No route to host
  instance-id: 
  public-ipv4: 
  local-ipv4 : 
wget: can't connect to remote host (169.254.169.254): No route to host
cloud-userdata: failed to read instance id
WARN: /etc/rc3.d/S99-cloud-userdata failed
  ____               ____  ____
 / __/ __ ____ ____ / __ \/ __/
/ /__ / // __// __// /_/ /\ \ 
\___//_//_/  /_/   \____/___/ 
 http://launchpad.net/cirros


login as 'cirros' user. default password: 'cubswin:)'. use 'sudo' for root.
cirros login: