Ask Your Question

VMs have no LAN or internet access

asked 2013-08-10 16:49:25 -0500

vicethal gravatar image

updated 2013-08-10 17:30:41 -0500


My OpenStack Grizzly install seems to be in mostly working order on this single node. But I cannot figure out how to give my VMs access to the internet.

I'd like my VMs to get their IPs from the local DHCP server, like a VirtualBox VM would behave when the adapter is set to "Bridged" mode. Barring that, I'd like them to get their fixed IP from OpenStack in a range that's on my LAN. Currently, I can define private networks, and VMs can communicate, but instances can't even reach outside of their networks, contact the internet, or actually provide useful services.

My Logon greeting:

Welcome to Ubuntu 12.04.2 LTS (GNU/Linux 3.5.0-37-generic x86_64)

 * Documentation:

  System information as of Sat Aug 10 17:10:32 EDT 2013

  System load:  0.16               Users logged in:       0
  Usage of /:   16.8% of 14.43GB   IP address for eth0:
  Memory usage: 3%                 IP address for eth0:0:
  Swap usage:   0%                 IP address for br100:
  Processes:    173

  Graph this data and manage this system at

0 packages can be updated.
0 updates are security updates.

My /etc/network/interfaces :

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static

auto eth0:0
iface eth0:0 inet static

auto br100
iface br100 inet dhcp
bridge_ports eth1
bridge_stp off
bridge_maxwait 0
bridge_fd 0

My intent was for eth1 to be used as the bridged adapter, and eth0 to be just for OpenStack usage. Both ports are plugged into the same unmanaged switch (Crazy I know, but I can't have any money/real parts until I show a working prototype).

I added this stansa to /etc/nova/nova.conf in hopes of getting my desired behavior:


And here's an image showing the operability I have gotten so far:

Any help would be greatly appreciated, I have been banging my head against a wall for a few weeks, and nothing I do seems to change anything. I'm trying to use the flat network manager, but I don't know how to make an OpenStack network to put VMs in that will do what I configured it to do.

edit retag flag offensive close merge delete

1 answer

Sort by ยป oldest newest most voted

answered 2013-08-11 22:36:15 -0500

I couldn't find any mistakes from your config file, but I have a same problem before and solved finally:

Before you launch an instance, a router and a subnet MUST be created and attached to the appropriate interfaces from Dashboard's Network Topology; Else the instance won't reach to Internet! It means the instance must be connect to a router within the same subnet, and also enter the correct DNS IPs in the router. Please try!


edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Get to know Ask OpenStack

Resources for moderators

Question Tools

1 follower


Asked: 2013-08-10 16:49:25 -0500

Seen: 1,478 times

Last updated: Aug 11 '13