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Thanks Salvatore, that's what I suspected. I noticed the subnet 
host_routes does the dhcp trick, but that does not help me, since the 
route out is in public network, not in guest network. I wonder if there 
are any plans toward adding extra routes to quantum router? Otherwise I 
need to add another real HW router in between my network :(

Techinically I suspect the work would require adding an extra route and 
a firewall rule into quantum routers namespace.

I'm sorry I hijacked this thread, we can move back to chat within my 
original question mail (s/hot/how/ in topic):

https://lists.launchpad.net/openstack/msg18853.html

I didn't get any replies there and this question was directly related...

BR,
  Ilkka

On 23.11.2012 16:10, Salvatore Orlando wrote:
> Hi Ilkka,
>
> you can associate host routes with a subnet. This will cause the
> dhcpagent to send an option 121 (classless-host-route) in the DHCPOFFER
> packet, thus configuring VM's route table.
> However, we do not support at the moment configuration of custom routes
> inside a logical router. The logical router will only route packet
> across subnets connected to it, or to the default external gateway.
>
> Best regards,
> Salvatore
>
> On 23 November 2012 13:20, Ilkka Tengvall <ilkka.tengvall at cybercom.com
> <mailto:ilkka.tengvall at cybercom.com>> wrote:
>
>     On 23.11.2012 13:12, James Page wrote:
>
>         You can specify the gateway_ip when creating the subnet:
>
>            --gateway <IP ADDRESS>
>
>         This should be the gateway that external network traffic should be
>         routed to by default (probably your default outbound route for
>         internet access).
>
>
>     How do you add additional routes for the router? e.g.
>
>     --gateway 10.1.1.1 #default gw
>     --gateway 20.1.1.0/24 <http://20.1.1.0/24> via 10.1.1.2 # another
>     gateway to specific network
>
>     BR,
>
>       -it
>
>
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