[Openstack] how to tell dhcp-agent to advertice certain routes?

Troy Klein spidersddd at gmail.com
Tue Oct 1 15:50:15 UTC 2013

We are not using quantum yet, but we do use a default gateway that is
different the the local server IP.  The way we do it is to add the
configfile "/etc/nova/dnsmasq-nova.conf" with
"dhcp-option:tag:br1099,option:route," in the file.

I hope this helps, let me know how it goes as I am going to be looking into
quantum/neutron to do networking soon.


On Fri, Sep 27, 2013 at 10:07 AM, Ilkka Tengvall <
ilkka.tengvall at cybercom.com> wrote:

> Hi,
> how to tell DHCP server (dnsmasq) to advertice an extra gateway in dhcp
> response?
> We are running grizzly and provider networks. Some of the networks are in
> vlan that already have an external router among the existing other machines
> in the same network.
> So we don't want multiple l3-agents for multiple floating ip ranges. We
> don't need any NAT rules for those networks, only a dhcp service for the
> given subnet range, and add the existing HW gateways address as default
> route to that dhcp responce.
> How to achieve that by  using quantum/neutron commands?
> I want this to be filled in dnsmasq config for the subnet by
> quantum-dhcp-agent:
> dhcp-option=3,
> The environment is rdo grizzly on rhel 6.4, up to date.
> --
> Ilkka Tengvall
> Advisory Consultant, Cloud Architecture
> Cybercom Finland
> mobile: +358408443462
> Email: ilkka.tengvall at cybercom.com
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