Reviewed: https://review.opendev.org/704436 Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=592c2f8d91c3172c75cc5a2464350891b0a303f1 Submitter: Zuul Branch: master
commit 592c2f8d91c3172c75cc5a2464350891b0a303f1 Author: Harald Jensås <[email protected]> Date: Fri Jan 17 12:29:10 2020 +0100 DHCPv6 - Use addr6_list in dnsmasq Adds a new bool option dnsmasq_enable_addr6_list, when enabled configuration for dnsmasq will be created with a single dhcp-host entry specifying a list of ip addresses allocated for a port. Previously the dnsmasq dhcp-agent driver would write a separate dhcp-host entry for each fixed-ip of a port in the dnsmasq hosts file. The result of the previous behaviour is that dnsmasq will only use one of the config entries, i.e the first one matching the mac identifier. The trade-off is that only a single dns_assignment will be used for IPv6 addresses within the same subnet. (But in practice, this was always the case since only the first config entry would be used by dnsmasq.) Why is this neccecary: This is done to enable ironic provisioning over IPv6 using DHCPv6-stateful. For background info, please read dnsmasq-discuss thread: http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2020q1/thread.html#13671 Closes-Bug: #1861032 Change-Id: I833840e7daed2efa7efaece27cfd1ba28e0feb90 ** Changed in: neutron Status: In Progress => Fix Released -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1861032 Title: [RFE] Add support for configuring dnsmasq with multiple IPv6 addresses in same subnet on same port Status in neutron: Fix Released Bug description: To enable network boot and Ironic provisioning a patch has been proposed to dnsmasq. The patch add's the possibility to provide list's of individual addresses as well as prefixed ranges of ipv6 addresses for a dhcp-host reservation. When dnsmasq recieve a request matching the clid or mac address is recieved the server will iterate over all candidate addresses until it find's one that is not already leased to a different clid/iaid and advertise this address. Using multiple reservations for a single host makes it possible to maintain a static leases only configuration which support network booting systems with UEFI firmware that request a new address (a new SOLICIT with a new IA_NA option using a new IAID) for different boot modes, for instance 'PXE over IPv6', and 'HTTP-Boot over IPv6'. Open Virtual Machine Firmware (OVMF) and most UEFI firmware build on the EDK2 code base exhibit this behaviour. A new configuration syntax is introduces in dnsmasq in patch: http://lists.thekelleys.org.uk/pipermail/dnsmasq- discuss/2020q1/013743.html For example: --dhcp- host=52:54:00:3f:5c:c0,[fd12:3456::aa02][fd12:3456::aa04],host1 The above will make the two addresses fd12:3456::aa02 and fd12:3456::aa04 available to the host with hardware address 52:54:00:3f:5c:c0. This RFE is to add functionality to the dnsmasq dhcp-agent implementation to write the new configuration format in the dnsmasq hosts file. Given a neutron port: "ports": [ { "dns_assignment": [ { "hostname": "myport02", "ip_address": "fd12:3456::aa02", "fqdn": "myport02.my-domain.org" }, { "hostname": "myport04", "ip_address": "fd12:3456::aa04", "fqdn": "myport04.my-domain.org" }, ], "fixed_ips": [ { "ip_address": "fd12:3456::aa02", "subnet_id": "008ba151-0b8c-4a67-98b5-0d2b87666062" }, { "ip_address": "fd12:3456::aa04", "subnet_id": "008ba151-0b8c-4a67-98b5-0d2b87666062" } ], "id": "d80b1a3b-4fc1-49f3-952e-1e2ab7081d8b", "mac_address": "fa:16:3e:58:42:ed", "network_id": "70c1db1f-b701-45bd-96e0-a313ee3430b3", }, ] } Current behaviour ----------------- dhcp-host=fa:16:3e:58:42:ed,myport02.my-domain.org,[fd12:3456::aa02] dhcp-host=fa:16:3e:58:42:ed,myport04.my-domain.org,[fd12:3456::aa04] NOTE, this configuration means dnsmasq will only ever lease fd12:3456::aa04. As it will always find that as the first valid configuration for mac fa:16:3e:58:42:ed. In other words, the _current behaviour is broken_. New behaviour ------------- dhcp-host=fa:16:3e:58:42:ed,myport02.my-domain.org,[fd12:3456::aa02][fd12:3456::aa04] This will allow dnsmasq to lase both addresses when requests from the client mac using different IAID's is recieved. To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1861032/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
