OpenStack Icehouse on IPv6
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1 OpenStack Icehouse on IPv6 Shixiong Shang v1.3
2 Agenda Introduction Overview Use Cases Design and Implementation Demo Next Steps 2
3 Introduction Nephos6 Founded in June, 2011 Service assurance company Web: Shixiong Shang Ciprian Popoviciu Founder, CEO IPv6 expert Head of Engineering 3
4 IPv6? IPv6 NOW! The promise of Cloud cannot be fully met without IPv6 - Nephos6 The Road To IPv6, Bumpy - Paul Saab from Facebook, 2014 V6 World Congress in Paris!!!!!!! Facebook s goal: 75% of internal traffic is now IPv6 with a goal to be at 100% by Q or earlier First IPv6 only cluster (no RFC1918) by end of % IPv6 only (no RFC1918) in 2-3 years 4
5 Overview OpenStack Neutron IPv6 sub team. Have been working with other stackers on weekly basis Comcast, IBM, Cisco, etc. Nephos6 main contributions: Proposed blueprints Implemented blueprints Submitted 400+ lines of python source code plus 300+ lines of unit testing code Target release: Icehouse in April, 2014 Status: Look forward to Juno.:) 5
6 Scope Current main focuses: Router Advertisement and Address Assignment SLAAC DHCPv6 (Stateful and Stateless) Tenant network Public Private/Provider Primary seven use cases Neutron Client (CLI + Dashboard): IBM and Cisco Neutron APIs: Comcast and IBM Database: Comcast Neutron DHCP Agent: Nephos6 6
7 IPv6 Address Auto-Configuration SLAAC* DHCPv6* IPv6 Address (non-link-local) By exchanging Router Solicitation and Router Advertisement messages with neighboring routers. From DHCPv6 server Additional Information None From DHCPv6 server Default Gateway The only way to announce default route is using Router Advertisement! Pros Plug and play IPv4-like approach, but better More control Cons Doesn t provide Hostname, DNS server, WINS, etc. Operational overhead (extra DHCP server, HA, etc.) * Based on ICMPv6 7
8 Use Cases - Public Tenant Network external network side (outside) tenant network (inside) neutron router VM 1 Router Advertisement Address Assignment: SLAAC Provided by OpenStack neutron router dhcpv6 server (stateful) VM 2 Router Advertisement Address Assignment: DHCPv6 Stateful neutron router dhcpv6 server (stateless) VM 3 Router Advertisement Address Assignment: DHCPv6 Stateless 8
9 Use Cases - Public Tenant Network external network side (outside) neutron router dhcpv6 server (stateful) tenant network (inside) Provided by customer VM 4 Provided by OpenStack Router Advertisement Address Assignment: DHCPv6 Stateful neutron router dhcpv6 server (stateless) Provided by customer VM 5 Router Advertisement Address Assignment: DHCPv6 Stateless 9
10 Use Cases - Provider Tenant Network external network side (outside) physical router dhcpv6 server (stateful) tenant network (inside) Provided by OpenStack VM 6 Provided by customer Router Advertisement Address Assignment: DHCPv6 Stateful physical router dhcpv6 server (stateless) Provided by Openstack VM 7 Router Advertisement Address Assignment: DHCPv6 Stateless 10
11 Use Cases - Private Tenant Network No external network side (outside) physical switch dhcpv6 server (stateful) tenant network (inside) Provided by OpenStack VM 8 Provided by customer Router Advertisement Address Assignment: DHCPv6 Stateful physical switch dhcpv6 server (stateless) Provided by Openstack VM 9 Router Advertisement Address Assignment: DHCPv6 Stateless 11
12 Who Sends RA? Who Assign Address? Network Type OpenStack ipv6_ra_mode OpenStack ipv6_address_mode Description external router (A=1, M=0, O=0) external router off off VM obtains IPv6 address from external router using SLAAC external router external DHCPv6 server off off VM obtains IPv6 address and optional info from external DHCPv6 server using DHCPv6 Stateful (A=0, M=1, O=1) OpenStack dnsmasq Private / Provider off dhcpv6-stateful VM obtains IPv6 address and optional info from OpenStack dnsmasq using DHCPv6 Stateful external router external DHCPv6 server off off VM obtains IPv6 address from external router by SLAAC and optional info from external DHCPv6 server using DHCPv6 Stateless (A=1, M=0, O=1) OpenStack dnsmasq Private / Provider off dhcpv6-stateless VM obtains IPv6 address from external router by SLAAC and optional info from OpenStack dnsmasq using DHCPv6 Stateless OpenStack dnsmasq (A=1, M=0, O=0) OpenStack dnsmasq Public slaac slaac VM obtains IPv6 address from OpenStack using SLAAC OpenStack dnsmasq external DHCPv6 server Public dhcpv6-stateful off VM obtains IPv6 address and optional info from external DHCPv6 server using DHCPv6 Stateful (A=0, M=1, O=1) OpenStack dnsmasq Public dhcpv6-stateful dhcpv6-stateful VM obtains IPv6 address and optional info from OpenStack dnsmasq using DHCPv6 Stateful OpenStack dnsmasq external DHCPv6 server Public dhcpv6-stateless off VM obtains IPv6 address from OpenStack by SLAAC and optional info from external DHCPv6 server using DHCPv6 Stateless (A=1, M=0, O=1) OpenStack dnsmasq Public dhcpv6-stateless dhcpv6-stateless VM obtains IPv6 address from OpenStack by SLAAC and optional info from OpenStack dnsmasq using DHCPv6 Stateless This table is created and submitted to Neutron IPv6 subteam by Shixiong Shang from Nephos6.
13 Design Proposal Separate the control of Router Advertisement from Address Assignment using two new attributes: Attribute Description Possible Values dhcpv6-stateful ipv6_ra_mode Determine who sends RA and which AMO bits are set. dhcpv6-stateless slaac attr_not_specified (i.e. blank) ipv6_address_mode Determine how VM obtains IPv6 address, default gateway, and/or optional information dhcpv6-stateful dhcpv6-stateless slaac attr_not_specified (i.e. blank) 13
14 Implementation Translate customer inputs to key/ value pairs in API call neutron client (via cli or horizon) New User Interface Launch dnsmasq for IPv6 subnets based on two attributes Controller Node Validate two attributes combination Neutron API Plugin Event / Task Driver (dnsmasq) DHCP Agent Network Node Attach two attributes values to IPv6 subnet DB RabbitMQ 14
15 Neutron Subnet Creation Neutron Client neutron subnet-create --ip-version 6 --name subnet-name network-name ipv6_prefix --enable-dhcp true --ipv6_ra_mode slaac --ipv6_address_mode slaac Neutron API MySQL DB 15
16 Challenges: Public Network 1. Keep dnsmasq behavior intact for IPv4 subnet 3. OpenStack needs to know VM s self- calculated IPv6 address in SLAAC case qdhcp namespace ns- interface :db8:1:1::a:b:c VM vnic :db8:1:1::x:y:z Network Node qrouter namespace IPv4 DHCP IPv6 RA and/or DHCPv6 Compute Node qr- interface qr- interface 2001:db8:1:1::1 2. Launch a dnsmasq instance for IPv6 subnet, bind it to the qr- gw interface and send RA from there. May use dnsmasq as DHCPv6 server. Switching security policy 4. Need ip6tables filter rules to enable ICMPv6 at inbound direction 16
17 Challenges: Private/Provider Network 1. Keep dnsmasq behavior intact for IPv4 subnet qdhcp namespace VM ns- interface :db8:1:1::a:b:c vnic :db8:1:1::x:y:z Network Node 2. Launch a separate dnsmasq instance for IPv6 subnet and bind it to the ns- interface. Use it as DHCPv6 server without sending RA IPv4 DHCP security policy IPv6 DHCPv6 Compute Node Switching 3. Need ip6tables filter rules to enable ICMPv6 at inbound direction 17
18 Icehouse Demo Setup Controller Node mysql db rabbitmq horizon keystone glance swift cinder nova-api nova-scheduler nova-consoleauth nova-novncproxy nova-cert nova-conductor neutron-server Network Node neutron-dhcp-agent neutron-l3-agent neutron-metadata-agent openvswitch neutron-openvswitchagent dnsmasq Compute Node nova-compute openvswitch-agent openvswitch eth0 eth0 eth1 eth2 eth0 eth2 Management and API Networks Tenant Data Networks Tenant External Network Router 18
19 Icehouse Demo Setup Network Node Compute Node Neutron Router :db8:1:1:: d 2001:db8:1:1:x:y:z:e VM OVSwitch OVSwitch OVSwitch Physical Router net1_priv1 sub1_priv1_ipv4: /24 sub1_priv1_ipv6: 2001:db8:1:1::/64 19
20 Icehouse Demo - Dual-Stack VM 20
21 Icehouse Demo - VM IPv4 and IPv6 Address 21
22 Icehouse Demo - IPv6 Default Gateway 22
23 Icehouse Demo - IPv6 Connectivity 23
24 Next Step Robustness ML2 friend or foe? IPv6 External network Prefix Delegation and more! Any product that is not IPv6 based is legacy from day one. - Nephos6 24
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