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diff --git a/docs/gapanalysis/gap-analysis-openstack-liberty.rst b/docs/gapanalysis/gap-analysis-openstack-liberty.rst new file mode 100644 index 0000000..d8241b9 --- /dev/null +++ b/docs/gapanalysis/gap-analysis-openstack-liberty.rst @@ -0,0 +1,118 @@ +.. 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) + +======================================== +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). | | | + +-----------------------------------------------------------+-------------------------+--------------------------------------------------------------------+ |