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=====================================
IPv6 Gap Analysis with OpenStack Kilo
=====================================
This section provides users with IPv6 gap analysis regarding feature requirement with
OpenStack Neutron in Kilo 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 Kilo Official Release.
+-------------------------------------+------------+-----------------------------------------------+
|Use Case / Requirement |Supported in|Notes |
| |Kilo Neutron| |
|=====================================+============+===============================================+
|All topologies work in a multi-tenant|Yes |The IPv6 design is following the Neutron tenant|
|environment | |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 |Yes |IPv6 provider network model; RA messages from |
|attached to a VM | |upstream (external) router are forwarded into |
| | |the VMs |
+-------------------------------------+------------+-----------------------------------------------+
|IPv6 subnet routed via L3 agent to an| |Configuration is enhanced in Kilo to allow |
|external IPv6 network | |easier setup of the upstream gateway, without |
| |1. Yes |the user forced to create an IPv6 subnet for |
|1. Both VLAN and overlay (e.g. GRE, | |the external network. |
| VXLAN) subnet attached to VMs; | | |
|2. Must be able to support multiple |2. Yes | |
| L3 agents for a given external | | |
| network to support scaling | | |
| (neutron scheduler to assign | | |
| vRouters to the L3 agents) | | |
+-------------------------------------+------------+-----------------------------------------------+
|Ability for a NIC to support both | |Dual-stack is supported in Neutron with the |
|IPv4 and IPv6 (dual stack) address. | |addition of ``Multiple IPv6 Prefixes`` |
| | |Blueprint |
|1. VM with a single interface |1. Yes | |
| associated with a network, which | | |
| is then associated with two | | |
| subnets | | |
|2. VM with two different interfaces |2. Yes | |
| associated with two 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 |Yes | |
|DHCPv6 Stateful subnet 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 |**No** |The following patch disables this operation: |
|fixed_ip for a SLAAC/DHCPv6-Stateless| |https://review.openstack.org/#/c/129144/ |
|Subnet. | | |
+-------------------------------------+------------+-----------------------------------------------+
|Support for private IPv6 to external |**Rejected**|Blueprint proposed in upstream and got |
|IPv6 floating IP; Ability to specify | |rejected. General expectation is to avoid NAT |
|floating IPs via Neutron API (REST | |with IPv6 by assigning GUA to tenant VMs. See |
|and CLI) as well as via Horizon, | |https://review.openstack.org/#/c/139731/ |
|including combination of IPv6/IPv4 | |for discussion. |
|and IPv4/IPv6 floating IPs if | | |
|implemented. | | |
+-------------------------------------+------------+-----------------------------------------------+
|Provide IPv6/IPv4 feature parity in |**To-Do** |The L3 configuration should be transparent for |
|support for pass-through capabilities| |the SR-IOV implementation. SR-IOV networking |
|(e.g., SR-IOV). | |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 |**No** |It does not appear to be considered yet (lack |
|example: IPSEC, IPv6 Anycast, | |of clear requirements) |
|Multicast | | |
+-------------------------------------+------------+-----------------------------------------------+
|VM access to the meta-data server to |**No** |This is currently not supported. Config-drive |
|obtain user data, SSH keys, etc. | |or dual-stack IPv4 / IPv6 can be used as a |
|using cloud-init with IPv6 only | |workaround (so that the IPv4 network is used to|
|interfaces. | |obtain connectivity with the metadata service) |
+-------------------------------------+------------+-----------------------------------------------+
|Full support for IPv6 matching (i.e.,|Yes | |
|IPv6, ICMPv6, TCP, 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, |Yes |Two new Subnet attributes were introduced to |
|there should be an option to allow | |control IPv6 address assignment options: |
|user to specify the type of address | | |
|management they would like. This | | |
|includes all options including those | |* ``ipv6-ra-mode``: to determine who sends |
|low priority if implemented (e.g., | | Router Advertisements; |
|toggle on/off router and address | | |
|prefix advertisements); It must be | |* ``ipv6-address-mode``: to determine how VM |
|supported via Neutron API (REST and | | obtains IPv6 address, default gateway, and/or|
|CLI) as well as via Horizon | | optional information. |
+-------------------------------------+------------+-----------------------------------------------+
|Security groups anti-spoofing: |Yes | |
|Prevent VM from using a source | | |
|IPv6/MAC address which is not | | |
|assigned to the VM | | |
+-------------------------------------+------------+-----------------------------------------------+
|Protect tenant and provider network |Yes |When using a tenant network, Neutron is going |
|from rough RAs | |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 |Yes | |
|multiple IPv6 addresses to an | | |
|interface; both for Neutron router | | |
|interfaces and VM interfaces. | | |
+-------------------------------------+------------+-----------------------------------------------+
|Ability for a VM to support a mix of |Yes | |
|multiple IPv4 and IPv6 networks, | | |
|including multiples of the same type.| | |
+-------------------------------------+------------+-----------------------------------------------+
|Support for IPv6 Prefix Delegation. |**Roadmap** |Some partial support is available in Liberty |
| | |release |
+-------------------------------------+------------+-----------------------------------------------+
|Distributed Virtual Routing (DVR) |**No** |Blueprint proposed upstream, pending discussion|
|support for IPv6 | | |
+-------------------------------------+------------+-----------------------------------------------+
|IPv6 First-Hop Security, IPv6 ND |**Roadmap** |Supported in Liberty release |
|spoofing. | | |
+-------------------------------------+------------+-----------------------------------------------+
|IPv6 support in Neutron Layer3 High |Yes | |
|Availability (keepalived+VRRP). | | |
+-------------------------------------+------------+-----------------------------------------------+
|
