Public bug reported:
DHCP option names are not standardized and option names that works with dnsmasq
doesn't work with Contrail. By trying to switch to dhcp option values we found
that it breaks dnsmasq case. As dnsmasq always set `siaddr` field in dhcp reply
to dnsmasq host ip unless `server-ip-address` is not configured. This field is
treated by pxe client as tftp server more information about this may be found
here https://tools.ietf.org/html/rfc5859.
We left this dnsmasq internal option `server-ip-address`. All dhcp providers we
tried contrail/dnsmasq/isc just silently ignore unknown options. But still we
concern that it may blow up with others. This is not an actual bug, it is only
our concern. And we wondered that it maybe standardized on Neutron side somehow
or at least basic validation is provided.
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1723354
Title:
No validation for DHCP options may lead to potential issues with
different dhcp backends
Status in neutron:
New
Bug description:
DHCP option names are not standardized and option names that works with
dnsmasq doesn't work with Contrail. By trying to switch to dhcp option values
we found that it breaks dnsmasq case. As dnsmasq always set `siaddr` field in
dhcp reply to dnsmasq host ip unless `server-ip-address` is not configured.
This field is treated by pxe client as tftp server more information about this
may be found here https://tools.ietf.org/html/rfc5859.
We left this dnsmasq internal option `server-ip-address`. All dhcp providers
we tried contrail/dnsmasq/isc just silently ignore unknown options. But still
we concern that it may blow up with others. This is not an actual bug, it is
only our concern. And we wondered that it maybe standardized on Neutron side
somehow or at least basic validation is provided.
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https://bugs.launchpad.net/neutron/+bug/1723354/+subscriptions
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