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Deploying IPv6 on OpenStack
This document discusses deploying IPv6 on OpenStack. It provides an overview of IPv6, including that IPv6 addresses the shortage of IPv4 addresses by providing a vastly larger 128-bit address space. It describes IPv6 address types and allocation methods. It also discusses IPv6 configuration modes in OpenStack, including stateless address autoconfiguration (SLAAC) and DHCPv6 stateless and stateful modes. Additionally, it covers deployment options for IPv6 on OpenStack like dual stack, NAT64/DNS64, and network tunnels. It provides details on IPv6 address and router advertisement configuration in OpenStack.
In this document
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Overview of the presentation agenda focused on IPv6 deployment in OpenStack and its importance.
Discussion on IPv4 address depletion and introduction of IPv6 as a long-term solution with a 128-bit address space.
Explains three IPv6 address configuration modes: SLAAC, DHCPv6 stateless, and stateful, with configuration options and benefits.
Overview of IPv6 deployment methods like Dual Stack and NAT64, and OpenStack-specific address configuration management.
Describes how Neutron router handles internal routing for IPv6 subnets and the concept of Global Unicast Address.
Specific commands and configurations for enabling IPv6 on various operating systems: RHEL, Ubuntu, and Windows.
Brief mention of troubleshooting aspects related to IPv6 deployments.
Closure of the presentation with a Q&A session and thanks to the audience.
Deploying IPv6 on OpenStack
- 1. Deploying IPv6 on OpenStack TungNguyen Thanh - VCCloud Oct 7 - 2017
- 2. Agenda ● IPv6 Overview ●IPv6 address management ● IPv6 deployments options and consideration points in OpenStack ● Deploying and Troubleshooting
- 3. IPv4: Running Outof Addresses - Short term solutions included: + NAT (Network Address Translation) + Private address space + CIDR (Classless Inter-Domain Routing) - Long-term solution: IPv6
- 4. Introducing IPv6 ● Nota “new” protocol. ● Developed mid to late 1990s. ● Much learned from IPv4. ● 128-bit address space, written in hexadecimal. ● This gives us 340 undecillion addresses!
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- 8. IPv6 Overview ● IPv6is not just about more addresses: ○ Stateless autoconfiguration ○ End-to-end reachability without private addresses and NAT ○ Better support for mobility ○ Peer-to-peer networking easier to create and maintain, and services such as VoIP and Quality of Service (QoS) become more robust. ○ Security ○ Routing
- 9. IPv5 ? IPv10 ? Is‘IPv6’ faster ?
- 10. IPv6 address configurationmodes Three configuration modes: ● SLAAC ● DHCPv6 stateless ● DHCPv6stateful
- 11. The configuration modeis determined based on RA flag: ● M (Managed) => 0 (RA/DHCPv6 stateless), 1 (DHCPv6 stateful ● O (Other) => 0 (SLAAC), 1 (use DHCPv6)
- 12. SLAAC (Stateless AddressAutoconfiguration) ● IPv6 address of a client is configured based on RA (Router advertisement) ● Gateway is also configured. ● Optionally, DNS information(if RFC6106), MTU and so on can be configured. ● Only /64 prefix is used
- 13. DHCP v6 Stateless ●IPv6 address is configured based on RA ● Other information is retrieved via DHCPv6 ● Looks used most commonly ● Only way to distribute DNS info before RFC6106
- 14. DHCP v6 Stateful ●All information is configured based on DHCPv6 ● There is information that GW is not configured properly.
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- 16. Dual Stack IPv4IPv6
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- 19. IPv6 on Openstack Twoattributes related to IPv6 address configuration: - Ipv6_address_mode: Control of how addressing is handled by OpenStack - Ipv6_ra_mode: Control of router advertisements for a subnet There are constraints between two modes - OpenStacknetworking guide - https://docs.openstack.org/ocata/networking-guide/config-ipv6 .html - https://access.redhat.com/documentation/en-us/red_hat_opens tack_platform/9/html/networking_guide/sec-ipv6
- 20. ● IPv6 addressmode: Specifies how IPv6 address is generated and assigned, IPAM is mainly involved in it and Also controls if the reference DHCP implementation serves ● “Slaac”: Neutron generates a port address based on MAC address (EUI-64) ● “Dhcpv6-stateless”: - Neutron generates a port address based on MAC address (EUI-64) - Neutron provides DHCP options for port ● “Dhcpv6-stateful” - Any address can be configured - Perhaps non-/64 prefix can be used ● Not Specified (N/S) - (Backward compatibility) - Any static address can be configured.
- 21. ● IPv6 RAmode: Specifies how neutron router sends RA ● "slaac" ● "dhcpv6-stateles" ● "dhcpv6-stateful" - Neutron setup radvd on a router and provides RA - RA flags are set accordingly ● Not Specified (N/S) - Neutron does nothing. - radvd on a router is not setup
- 22. The behavior ofthe neutron router for IPv6 - Internal router ports, that act as default gateway ports for a network, will share a common port for all IPv6 subnets associated with the network. - Neutron tenant networks that are assigned Global Unicast Address (GUA) prefixes and addresses don’t require NAT on the neutron router external gateway port to access the outside world - GUA IPv6 subnet prefix is not necessarily needed for the neutron external network. By default, a IPv6 LLA associated with the external gateway port can be used for routing purposes.
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- 25. Changelog on images(glance) RHEL / CentOS / Oracle Linux Edit the file /etc/sysconfig/network and add the following parameter: NETWORKING_IPV6=yes Edit the file /etc/sysconfig/network-scripts/ifcfg-eth0 and add the following two parameters: IPV6INIT=yes DHCPV6C=yes
- 26. Changelog on images(glance) Ubuntu Edit the file /etc/dhcp/dhclient6.conf and add the following line: timeout 10; Edit the network configuration for the eth0 interface with the following configuration: Edit the file /etc/network/interfaces iface eth0 inet6 dhcp
- 27. Changelog on images(glance) Windows netsh interface ipv6 set interface 15 routerdiscovery=disabled netsh interface ipv6 set interface 15 managedaddress=enabled netsh interface ipv6 set interface 15 otherstateful=enabled https://support.microsoft.com/en-us/help/961433/how-to-configure-a-windo ws-vista-client-to-obtain-an-ipv6-dhcp-address
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