openstack team mailing list archive

[James Page <james.page@xxxxxxxxxxxxx>]

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Hi Skible

On 23/11/12 09:59, Skible OpenStack wrote:
> I have some questions about the quantum demo install found here : 
> http://docs.openstack.org/trunk/openstack-network/admin/content/demo_logical_network_config.html
>
>  Can someone please tell me what should the IP address of eth2 (
> bridged on br-ex) ? and how it's related to the external network
> related later ?

eth2 won't need an IP address - but at a minimum the link needs to be
up so that br-ex can use it:

   ip link set eth2 up

You can add an IP address to br-ex itself but that it not required
(sometimes helpful for debugging network connectivity issues from the
quantum l3-agent host).

> quantum subnet-create ext_net 172.24.4.224/28 --
> --enable_dhcp=False
> 
> +------------------+--------------------------------------------------+
>
> 
| Field            | Value                                            |
> +------------------+--------------------------------------------------+
>
> 
| allocation_pools | {"start": "172.24.4.226", "end": "172.24.4.238"} |
> | cidr             | 172.24.4.224/28
> | | dns_nameservers  |
> | | enable_dhcp      | False
> | | gateway_ip       | 172.24.4.225
> | | host_routes      |
> | | id               | aef60b55-cbff-405d-a81d-406283ac6cff
> | | ip_version       | 4
> | | name             |
> | | network_id       | 8858732b-0400-41f6-8e5c-25590e67ffeb
> | | tenant_id        | cbb574ac1e654a0a992bfc0554237abf
> | 
> +------------------+--------------------------------------------------+
>
>  I would like also to query about how to get the gateway_ip ?
> should it be created by default or mapped to the IP address of eth2
> ??

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).

When you associate the external network with the router using 'quantum
router-gateway-set' the quantum l3-agent will configure a router with
an IP address on the quantum host using an IP from the allocation pool.

HTH


- -- 
James Page
Technical Lead
Ubuntu Server Team
james.page@xxxxxxxxxxxxx
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