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Message #81434
[Bug 1861032] [NEW] [RFE] Add support for configuring dnsmasq with multiple IPv6 addresses in same subnet on same port
Public bug reported:
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.
** Affects: neutron
Importance: Undecided
Assignee: Harald Jensås (harald-jensas)
Status: In Progress
** Tags: rfe
--
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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:
In Progress
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.
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