title: openstack networking can't ping/ssh from/to VMs
body: <p>I've installed multi-node openstak using devstack script. Can run VMs, but problem with networking, can't ssh/ping from one VM to another. I can ssh to VM only from host (control1,computeX) where it running, from other hosts can't. Any suggestions? </p>
  
  <pre><code>nova-compute     control1                             nova             enabled    :-)   
  nova-cert        control1                             nova             enabled    :-)   
  nova-network     control1                             nova             enabled    :-)   
  nova-scheduler   control1                             nova             enabled    :-)   
  nova-consoleauth control1                             nova             enabled    :-)   
  nova-compute     compute1                             nova             enabled    :-)   
  nova-volume      compute1                             nova             enabled    :-)   
  nova-network     compute1                             nova             enabled    :-)   
  nova-compute     compute2                             nova             enabled    :-)   
  nova-volume      compute2                             nova             enabled    :-)   
  nova-network     compute2                             nova             enabled    :-)   
  </code></pre>
  
  <p>control1 /etc/network/interfaces</p>
  
  <pre><code># The loopback network interface
  auto lo
  iface lo inet loopback
  
  # The primary network interface
  auto eth0
  iface eth0 inet static
  address 172.16.0.1
  #address 172.16.0.101
  netmask 255.255.255.0
  network 172.16.0.0
  broadcast 172.16.0.255
  gateway 172.16.0.254
  dns-nameservers 8.8.8.8
  
  
  auto eth1
  iface eth1 inet static
  address 11.0.0.4
  netmask 255.255.255.0
  network 11.0.0.0
  broadcast 11.0.0.255
  </code></pre>
  
  <p>compute1 /etc/network/interfaces</p>
  
  <pre><code># The loopback network interface
  auto lo
  iface lo inet loopback
  
  # The primary network interface
  auto eth0
  iface eth0 inet static
  address 172.16.0.2
  netmask 255.255.255.0
  network 172.16.0.0
  broadcast 172.16.0.255
  gateway 172.16.0.254
  dns-nameservers 8.8.8.8
  
  
  auto eth1
  iface eth1 inet static
  address 11.0.0.5
  netmask 255.255.255.0
  network 11.0.0.0
  broadcast 11.0.0.255
  </code></pre>
  
  <p>control1 /etc/nova/nova.conf</p>
  
  <pre><code>[DEFAULT]
  verbose=True
  auth_strategy=keystone
  allow_resize_to_same_host=True
  root_helper=sudo /usr/local/bin/nova-rootwrap /etc/nova/rootwrap.conf
  compute_scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler
  dhcpbridge_flagfile=/etc/nova/nova.conf
  fixed_range=10.1.0.0/16
  s3_host=172.16.0.1
  s3_port=3333
  network_manager=nova.network.manager.FlatDHCPManager
  osapi_compute_extension=nova.api.openstack.compute.contrib.standard_extensions
  my_ip=172.16.0.1
  public_interface=eth0
  vlan_interface=eth0
  flat_network_bridge=br100
  flat_interface=eth1
  sql_connection=mysql://root:supersecret@172.16.0.1/nova?charset=utf8
  libvirt_type=qemu
  libvirt_cpu_mode=none
  instance_name_template=instance-%08x
  novncproxy_base_url=http://172.16.0.1:6080/vnc_auto.html
  xvpvncproxy_base_url=http://172.16.0.1:6081/console
  vncserver_listen=127.0.0.1
  vncserver_proxyclient_address=127.0.0.1
  api_paste_config=/etc/nova/api-paste.ini
  image_service=nova.image.glance.GlanceImageService
  ec2_dmz_host=172.16.0.1
  rabbit_host=172.16.0.1
  rabbit_password=supersecret
  glance_api_servers=172.16.0.1:9292
  force_dhcp_release=True
  multi_host=True
  send_arp_for_ha=True
  use_syslog=True
  logging_context_format_string=%(asctime)s %(levelname)s %(name)s [%(request_id)s %(user_name)s %(project_name)s] %(instance)s%(message)s
  volume_api_class=nova.volume.cinder.API
  compute_driver=libvirt.LibvirtDriver
  firewall_driver=nova.virt.libvirt.firewall.IptablesFirewallDriver
  enabled_apis=ec2,osapi_compute,metadata
  </code></pre>