On Mon, Dec 1, 2014 at 6:12 AM, Assaf Muller <amul...@redhat.com> wrote:
>
>
> ----- Original Message -----
>>
>> My proposal here, is, _let’s not deprecate this setting_, as it’s a valid use
>> case of a gateway configuration, and let’s provide it on the reference
>> implementation.
>
> I agree. As long as the reference implementation works with the setting off
> there's no need to deprecate it. I still think the default should be set to 
> True
> though.
>
> Keep in mind that the DHCP agent will need changes as well.
>
++ to both suggestions Assaf. Thanks for bringing this up Miguel!

Kyle

>>
>> TL;DR
>>
>> I’ve been looking at this yesterday, during a test deployment
>> on a site where they provide external connectivity with the
>> gateway outside subnet.
>>
>> And I needed to switch it of, to actually be able to have any external
>> connectivity.
>>
>> https://github.com/openstack/neutron/blob/master/etc/neutron.conf#L121
>>
>> This is handled by providing an on-link route to the gateway first,
>> and then adding the default gateway.
>>
>> It looks to me very interesting (not only because it’s the only way to work
>> on that specific site [2][3][4]), because you can dynamically wire RIPE
>> blocks to your server, without needing to use an specific IP for external
>> routing or broadcast purposes, and instead use the full block in openstack.
>>
>>
>> I have a tiny patch to support this on the neutron l3-agent [1] I yet need to
>> add the logic to check “gateway outside subnet”, then add the “onlink”
>> route.
>>
>>
>> [1]
>>
>> diff --git a/neutron/agent/linux/interface.py
>> b/neutron/agent/linux/interface.py
>> index 538527b..5a9f186 100644
>> --- a/neutron/agent/linux/interface.py
>> +++ b/neutron/agent/linux/interface.py
>> @@ -116,15 +116,16 @@ class LinuxInterfaceDriver(object):
>> namespace=namespace,
>> ip=ip_cidr)
>>
>> - if gateway:
>> - device.route.add_gateway(gateway)
>> -
>> new_onlink_routes = set(s['cidr'] for s in extra_subnets)
>> + if gateway:
>> + new_onlink_routes.update([gateway])
>> existing_onlink_routes = set(device.route.list_onlink_routes())
>> for route in new_onlink_routes - existing_onlink_routes:
>> device.route.add_onlink_route(route)
>> for route in existing_onlink_routes - new_onlink_routes:
>> device.route.delete_onlink_route(route)
>> + if gateway:
>> + device.route.add_gateway(gateway)
>>
>> def delete_conntrack_state(self, root_helper, namespace, ip):
>> """Delete conntrack state associated with an IP address.
>>
>> [2] http://www.soyoustart.com/
>> [3] http://www.ovh.co.uk/
>> [4] http://www.kimsufi.com/
>>
>>
>> Miguel Ángel Ajo
>>
>>
>>
>>
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>
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