I've installed OpenStack Icehouse on Ubuntu 14.04 LTS and configured neutron as per chapter 7 in the installation guide. I loose connectivity to the host shortly after adding a port to the external bridge. I've been struggling with it for a while now. Any assistance would be greatly appreciated.

root@qa-openstack01:~# ifconfig
br-ex     Link encap:Ethernet  HWaddr 0a:79:3b:d0:1b:4b
          inet6 addr: fe80::c42e:deff:feec:e98d/64 Scope:Link
          UP BROADCAST RUNNING  MTU:1500  Metric:1
          RX packets:7337 errors:0 dropped:4 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:519421 (519.4 KB)  TX bytes:648 (648.0 B)

br-int    Link encap:Ethernet  HWaddr e6:cc:9d:fc:ae:46
          inet6 addr: fe80::e855:a1ff:fe71:a8d1/64 Scope:Link
          UP BROADCAST RUNNING  MTU:1500  Metric:1
          RX packets:17 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1402 (1.4 KB)  TX bytes:648 (648.0 B)

br-tun    Link encap:Ethernet  HWaddr a2:7b:9e:02:c1:46
          inet6 addr: fe80::a86f:82ff:fe8e:4202/64 Scope:Link
          UP BROADCAST RUNNING  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:648 (648.0 B)

eth0      Link encap:Ethernet  HWaddr 00:22:64:9b:38:46
          inet addr:10.10.12.7  Bcast:10.10.12.255  Mask:255.255.255.0
          inet6 addr: fe80::222:64ff:fe9b:3846/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:8109 errors:0 dropped:7 overruns:0 frame:0
          TX packets:993 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:654520 (654.5 KB)  TX bytes:74139 (74.1 KB)

eth1      Link encap:Ethernet  HWaddr 00:22:64:9b:58:8a
          inet addr:10.10.13.231  Bcast:10.10.13.255  Mask:255.255.255.0
          UP BROADCAST PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:70937 errors:0 dropped:0 overruns:0 frame:0
          TX packets:70937 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:15371070 (15.3 MB)  TX bytes:15371070 (15.3 MB)

virbr0    Link encap:Ethernet  HWaddr 9e:c4:fc:2f:86:60
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask ...