Open Stack

Hi Ian,

Neutron dhcp server only serves IPs to the MACs defined in its host file
(/var/lib/neutron/dhcp/UUID/host).

You can create a port for the physical server if you know the MAC address
and this make it work, check the help for the "neutron port-create" command:
neutron help port-create

Cheers,
George



On Fri, Feb 26, 2016 at 11:33 AM, iain smith <iain at 3birds.co.uk> wrote:

> Hi all - I'm currently trying to get something working on my openstack
> platform, wondering if anyone's come across this before.
>
> On a VLAN tenant network, how can I allow an external device to pick up
> a dhcp address from neutron's dhcp service (the dhcp service associated
> with the subnet created in the tenant vlan network)?
>
> - I'm using liberty, and have created some vlan networks as admin user,
> and assigned them to the 'demo' project.
> - logged in as demo, I've created a dhcp-enabled subnet in one of the
> vlan networks, and a security group that allows hosts in the same subnet
> to connect to openstack guests in that subnet.
> - I've created some openstack guest VMs in the subnet - they came up ok
> and picked up dhcp ip addresses. I can connect to these guests from an
> external server on the same VLAN (a server outside of openstack). I can
> connect to the external server from the openstack guest VMs. All as
> expected.
>
> What I'm trying to do is to get an external (non-openstack) device on
> the same vlan to pick up a dhcp ip address from the openstack dhcp
> service for that subnet. Using wireshark I can see the dhcp request
> packets from my device, on the correct vlan, reaching my neutron network
> node where the dnsmasq dhcp service is running, but there's never a
> reply. I've tried putting wide-open ingress rules in the security group,
> but haven't got it to work yet (I'm not actually sure if the security
> group has any bearing at the subnet level as per AWS, or if it applies
> only to guest VMs... looks to me like it just applies to VMs).
>
> Anyone know what I need to do? I'll keep at it meantime
>
> cheers
> Iain
> --
>
>
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