Public bug reported:
With dnsmasq 2.81 DHCP for instances connected to network with both IPv4 and
IPv6 dhcp-stateful networks will not work as it should. Dnsmasq is processing
"host" file's entries from the bottom to the top and as neutron always places
first IPv4 and then IPv6 addresses for same MAC, DHCP for IPv4 will not work
now.
Details are in Harald's email:
http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2020q2/014038.html
Basically it's not Neutron's fault but regression in dnsmasq, but we can
workaround it by changing how we generate host file. If it will be one
line per mac address, like:
fa:16:3e:b2:5f:a2,host-10-0-0-72.openstacklocal,[fd05:321f:2d56:1::b5]
fa:16:3e:08:f4:1f,host-10-0-0-2.openstacklocal,10.0.0.2,[fd05:321f:2d56:1::2]
fa:16:3e:9d:76:87,host-10-0-0-31.openstacklocal,10.0.0.31,[fd05:321f:2d56:1::8]
fa:16:3e:9f:f9:a5,host-10-0-0-60.openstacklocal,10.0.0.60,[fd05:321f:2d56:1::30a]
fa:16:3e:8c:47:e5,host-10-0-0-1.openstacklocal,10.0.0.1
then it should works fine in both dnsmasq 2.81 and older versions.
** Affects: neutron
Importance: Undecided
Assignee: Slawek Kaplonski (slaweq)
Status: New
** Tags: l3-ipam-dhcp
** Changed in: neutron
Assignee: (unassigned) => Slawek Kaplonski (slaweq)
** Tags added: l3-ipam-dhcp
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https://bugs.launchpad.net/bugs/1876094
Title:
Dnsmasq 2.81 broke neutron's DHCP service
Status in neutron:
New
Bug description:
With dnsmasq 2.81 DHCP for instances connected to network with both IPv4 and
IPv6 dhcp-stateful networks will not work as it should. Dnsmasq is processing
"host" file's entries from the bottom to the top and as neutron always places
first IPv4 and then IPv6 addresses for same MAC, DHCP for IPv4 will not work
now.
Details are in Harald's email:
http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2020q2/014038.html
Basically it's not Neutron's fault but regression in dnsmasq, but we
can workaround it by changing how we generate host file. If it will be
one line per mac address, like:
fa:16:3e:b2:5f:a2,host-10-0-0-72.openstacklocal,[fd05:321f:2d56:1::b5]
fa:16:3e:08:f4:1f,host-10-0-0-2.openstacklocal,10.0.0.2,[fd05:321f:2d56:1::2]
fa:16:3e:9d:76:87,host-10-0-0-31.openstacklocal,10.0.0.31,[fd05:321f:2d56:1::8]
fa:16:3e:9f:f9:a5,host-10-0-0-60.openstacklocal,10.0.0.60,[fd05:321f:2d56:1::30a]
fa:16:3e:8c:47:e5,host-10-0-0-1.openstacklocal,10.0.0.1
then it should works fine in both dnsmasq 2.81 and older versions.
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