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.. This work is licensed under a Creative Commons Attribution 4.0 International License.
.. http://creativecommons.org/licenses/by/4.0
.. (c) Bin Hu (AT&T) and Sridhar Gaddam (RedHat)
=========================================
Using IPv6 Feature of Brahmaputra Release
=========================================
This section provides the users with gap analysis regarding IPv6 feature requirements with
OpenStack Liberty Official Release and Open Daylight Beryllium Official Release. The gap analysis
serves as feature specific user guides and references when as a user you may leverage the
IPv6 feature in the platform and need to perform some IPv6 related operations.
****************************************
IPv6 Gap Analysis with OpenStack Liberty
****************************************
This section provides users with IPv6 gap analysis regarding feature requirement with
OpenStack Neutron in Liberty Official Release. The following table lists the use cases / feature
requirements of VIM-agnostic IPv6 functionality, including infrastructure layer and VNF
(VM) layer, and its gap analysis with OpenStack Neutron in Liberty Official Release.
.. table::
:class: longtable
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Use Case / Requirement |Supported in Liberty |Notes |
+===========================================================+=========================+====================================================================+
|All topologies work in a multi-tenant environment |Yes |The IPv6 design is following the Neutron tenant networks model; |
| | |dnsmasq is being used inside DHCP network namespaces, while radvd |
| | |is being used inside Neutron routers namespaces to provide full |
| | |isolation between tenants. Tenant isolation can be based on VLANs, |
| | |GRE, or VXLAN encapsulation. In case of overlays, the transport |
| | |network (and VTEPs) must be IPv4 based as of today. |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|IPv6 VM to VM only |Yes |It is possible to assign IPv6-only addresses to VMs. Both switching |
| | |(within VMs on the same tenant network) as well as east/west routing|
| | |(between different networks of the same tenant) are supported. |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|IPv6 external L2 VLAN directly attached to a VM |Yes |IPv6 provider network model; RA messages from upstream (external) |
| | |router are forwarded into the VMs |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|IPv6 subnet routed via L3 agent to an external IPv6 network| |Configuration is enhanced since Kilo to allow easier setup of the |
| |1. Yes |upstream gateway, without the user being forced to create an IPv6 |
|1. Both VLAN and overlay (e.g. GRE, VXLAN) subnet attached | |subnet for the external network. |
| to VMs; | | |
|2. Must be able to support multiple L3 agents for a given |2. Yes | |
| external network to support scaling (neutron scheduler | | |
| to assign vRouters to the L3 agents) | | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Ability for a NIC to support both IPv4 and IPv6 (dual | |Dual-stack is supported in Neutron with the addition of |
|stack) address. | |``Multiple IPv6 Prefixes`` Blueprint |
| | | |
|1. VM with a single interface associated with a network, |1. Yes | |
| which is then associated with two subnets. | | |
|2. VM with two different interfaces associated with two |2. Yes | |
| different networks and two different subnets. | | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Support IPv6 Address assignment modes. |1. Yes | |
| | | |
|1. SLAAC |2. Yes | |
|2. DHCPv6 Stateless | | |
|3. DHCPv6 Stateful |3. Yes | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Ability to create a port on an IPv6 DHCPv6 Stateful subnet |Yes | |
|and assign a specific IPv6 address to the port and have it | | |
|taken out of the DHCP address pool. | | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Ability to create a port with fixed_ip for a |**No** |The following patch disables this operation: |
|SLAAC/DHCPv6-Stateless Subnet. | |https://review.openstack.org/#/c/129144/ |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Support for private IPv6 to external IPv6 floating IP; |**Rejected** |Blueprint proposed in upstream and got rejected. General expectation|
|Ability to specify floating IPs via Neutron API (REST and | |is to avoid NAT with IPv6 by assigning GUA to tenant VMs. See |
|CLI) as well as via Horizon, including combination of | |https://review.openstack.org/#/c/139731/ for discussion. |
|IPv6/IPv4 and IPv4/IPv6 floating IPs if implemented. | | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Provide IPv6/IPv4 feature parity in support for |**To-Do** |The L3 configuration should be transparent for the SR-IOV |
|pass-through capabilities (e.g., SR-IOV). | |implementation. SR-IOV networking support introduced in Juno based |
| | |on the ``sriovnicswitch`` ML2 driver is expected to work with IPv4 |
| | |and IPv6 enabled VMs. We need to verify if it works or not. |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Additional IPv6 extensions, for example: IPSEC, IPv6 |**No** |It does not appear to be considered yet (lack of clear requirements)|
|Anycast, Multicast | | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|VM access to the meta-data server to obtain user data, SSH |**No** |This is currently not supported. Config-drive or dual-stack IPv4 / |
|keys, etc. using cloud-init with IPv6 only interfaces. | |IPv6 can be used as a workaround (so that the IPv4 network is used |
| | |to obtain connectivity with the metadata service) |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Full support for IPv6 matching (i.e., IPv6, ICMPv6, TCP, |Yes | |
|UDP) in security groups. Ability to control and manage all | | |
|IPv6 security group capabilities via Neutron/Nova API (REST| | |
|and CLI) as well as via Horizon. | | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|During network/subnet/router create, there should be an |Yes |Two new Subnet attributes were introduced to control IPv6 address |
|option to allow user to specify the type of address | |assignment options: |
|management they would like. This includes all options | | |
|including those low priority if implemented (e.g., toggle | |* ``ipv6-ra-mode``: to determine who sends Router Advertisements; |
|on/off router and address prefix advertisements); It must | | |
|be supported via Neutron API (REST and CLI) as well as via | |* ``ipv6-address-mode``: to determine how VM obtains IPv6 address, |
|Horizon | | default gateway, and/or optional information. |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Security groups anti-spoofing: Prevent VM from using a |Yes | |
|source IPv6/MAC address which is not assigned to the VM | | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Protect tenant and provider network from rogue RAs |Yes |When using a tenant network, Neutron is going to automatically |
| | |handle the filter rules to allow connectivity of RAs to the VMs only|
| | |from the Neutron router port; with provider networks, users are |
| | |required to specify the LLA of the upstream router during the subnet|
| | |creation, or otherwise manually edit the security-groups rules to |
| | |allow incoming traffic from this specific address. |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Support the ability to assign multiple IPv6 addresses to |Yes | |
|an interface; both for Neutron router interfaces and VM | | |
|interfaces. | | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Ability for a VM to support a mix of multiple IPv4 and IPv6|Yes | |
|networks, including multiples of the same type. | | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Support for IPv6 Prefix Delegation. |Yes |Partial support in Liberty |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|Distributed Virtual Routing (DVR) support for IPv6 |**No** |Blueprint proposed upstream, pending discussion. |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|IPv6 First-Hop Security, IPv6 ND spoofing |Yes | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
|IPv6 support in Neutron Layer3 High Availability |Yes | |
|(keepalived+VRRP). | | |
+-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+
**********************************************
IPv6 Gap Analysis with Open Daylight Beryllium
**********************************************
This section provides users with IPv6 gap analysis regarding feature requirement with
Open Daylight Beryllium Official Release. The following table lists the use cases / feature
requirements of VIM-agnostic IPv6 functionality, including infrastructure layer and VNF
(VM) layer, and its gap analysis with Open Daylight Beryllium Official Release.
.. table::
:class: longtable
+-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
|Use Case / Requirement |Supported in ODL Beryllium|Notes |
+=============================================================+==========================+==========================================================================+
|REST API support for IPv6 subnet creation in ODL |Yes |Yes, it is possible to create IPv6 subnets in ODL using Neutron REST API. |
| | | |
| | |For a network which has both IPv4 and IPv6 subnets, ODL mechanism driver |
| | |will send the port information which includes IPv4/v6 addresses to ODL |
| | |Neutron northbound API. When port information is queried it displays IPv4 |
| | |and IPv6 addresses. However, in Beryllium release, ODL net-virt provider |
| | |does not support IPv6 features (i.e., the actual functionality is missing |
| | |and would be available only in the later releases of ODL). |
+-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
|IPv6 Router support in ODL |**No** |ODL net-virt provider in Beryllium release only supports IPv4 Router. |
| | | |
|1. Communication between VMs on same compute node | |In the meantime, if IPv6 Routing is necessary, we can use ODL for L2 |
|2. Communication between VMs on different compute nodes | |connectivity and Neutron L3 agent for IPv4/v6 routing. |
| (east-west) | | |
|3. External routing (north-south) | | |
+-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
|IPAM: Support for IPv6 Address assignment modes. |**No** |Although it is possible to create different types of IPv6 subnets in ODL, |
| | |ODL_L3 would have to implement the IPv6 Router that can send out Router |
|1. SLAAC | |Advertisements based on the IPv6 addressing mode. Router Advertisement |
|2. DHCPv6 Stateless | |is also necessary for VMs to configure the default route. |
|3. DHCPv6 Stateful | | |
+-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
|When using ODL for L2 forwarding/tunneling, it is compatible |Yes | |
|with IPv6. | | |
+-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
|Full support for IPv6 matching (i.e., IPv6, ICMPv6, TCP, UDP)|**No** |Security Groups for IPv6 is a work in progress. |
|in security groups. Ability to control and manage all IPv6 | | |
|security group capabilities via Neutron/Nova API (REST and | | |
|CLI) as well as via Horizon. | | |
+-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
|Shared Networks support |**No** |ODL currently assumes a single tenant to network mapping and does not |
| | |support shared networks among tenants. |
+-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
|IPv6 external L2 VLAN directly attached to a VM. |**ToDo** | |
+-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
|ODL on an IPv6 only Infrastructure. |**ToDo** |Deploying OpenStack with ODL on an IPv6 only infrastructure where the API |
| | |endpoints are all IPv6 addresses. |
+-------------------------------------------------------------+--------------------------+--------------------------------------------------------------------------+
|
