592c2f8d91
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
26 lines
1.3 KiB
YAML
26 lines
1.3 KiB
YAML
---
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features:
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Adds support for configuring a list of IPv6 addresses for a dhcp-host entry
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in the dnsmasq DHCP agent driver. For a port with multiple IPv6 fixed-ips
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in the same subnet a single dhcp-host entry including all the addresses are
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written to the dnsmasq dhcp-hostsfile.
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Reserving multiple addresses for a host eases problems related to network
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and chain-booting where each step in the boot process requests an address
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using different DUID/IAID combinations. With a single address, only one
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gets the "static" address and the boot process will fail on the following
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steps. By reserving enough addresses for all the stages of the boot process
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this problem is resolved. (See bug:
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`#1861032 <https://bugs.launchpad.net/neutron/+bug/1861032>`_)
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.. NOTE:: This requires dnsmasq version 2.81 or later. Some distributions
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may backport this feauture to earlier dnsmasq version as part of
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the packaging, check the distributions releasenotes.
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Since the new configuration format is invalid in previous versions
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of dnsmasq this feauture is *disabled* by default. To *enable* the
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feature set the option ``dnsmasq_enable_addr6_list`` in DHCP agent
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configuration to ``True``.
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