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Hi Andrei,

Default gateways for IPv6 is always configured with Router Advertisements (RA), no matter what addressing mode is used. Please ensure that:

- you have a virtual router connected to your IPv6 subnet, this would provide RA (and actual router) in your network
- accept_ra is enabled in your guest OS: sysctl -a | grep accept_ra

-- 
With best regards,
Vladimir Eremin,
Fuel Deployment Engineer,
Mirantis, Inc.



> On Dec 23, 2015, at 12:50 AM, Andrei Radulescu-Banu <andrei.radulescu-banu at exfo.com> wrote:
> 
> Hi all,
>  
> I’ve been trying for a few days to understand how this should work. My guest OS is Linux based, using ISC dhclient. In devstack I have configured an ipv6 net and subnet:
>  
> [stack at localhost images]$ neutron net-show private6
> +---------------------------+--------------------------------------+
> | Field                     | Value                                |
> +---------------------------+--------------------------------------+
> | admin_state_up            | True                                 |
> | availability_zone_hints   |                                      |
> | availability_zones        | nova                                 |
> | id                        | 55170162-305e-4d04-a159-2a141f0cd685 |
> | mtu                       | 0                                    |
> | name                      | private6                             |
> | port_security_enabled     | True                                 |
> | provider:network_type     | vxlan                                |
> | provider:physical_network |                                      |
> | provider:segmentation_id  | 1063                                 |
> | router:external           | False                                |
> | shared                    | False                                |
> | status                    | ACTIVE                               |
> | subnets                   | 4ea435ac-0ede-4dbc-9096-d97c256cc4d5 |
> | tenant_id                 | 9ede0af4cbe94caf8222b1dcfaac0754     |
> +---------------------------+--------------------------------------+
>  
> [stack at localhost images]$ neutron subnet-show private-subnet6
> +-------------------+--------------------------------------------------+
> | Field             | Value                                            |
> +-------------------+--------------------------------------------------+
> | allocation_pools  | {"start": "1:2:3:4::100", "end": "1:2:3:4::200"} |
> | cidr              | 1:2:3:4::/64                                     |
> | dns_nameservers   | 1:2:3:4::2                                       |
> | enable_dhcp       | True                                             |
> | gateway_ip        | 1:2:3:4::1                                       |
> | host_routes       |                                                  |
> | id                | 4ea435ac-0ede-4dbc-9096-d97c256cc4d5             |
> | ip_version        | 6                                                |
> | ipv6_address_mode | dhcpv6-stateful                                  |
> | ipv6_ra_mode      | dhcpv6-stateful                                  |
> | name              | private-subnet6                                  |
> | network_id        | 55170162-305e-4d04-a159-2a141f0cd685             |
> | subnetpool_id     |                                                  |
> | tenant_id         | 9ede0af4cbe94caf8222b1dcfaac0754                 |
> +-------------------+--------------------------------------------------+
>  
> When running dhclient on the interface, however, I am only able to acquire the interface address, but not the interface default gateway. I suppose the default gateway should be obtained through dhcp6 rather than neighbor discovery, because I set both ipv6_address_mode and ipv6_ra_mode to dhcpv6-stateful.
>  
> Any ideas? 
>  
> Thanks,
> Andrei
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