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[Justin Santa Barbara <justin@xxxxxxxxxxxx>]

> The instance firewall should be configured to only allow DHCP
> responses from the IP it believes to be the correct DHCP server.
> Perhaps it has the wrong idea?

Ah yes - it probably does because of my unusual network "subrange" config.

It seems I'm not "missing something", so I've proposed a init script
for contrib that can apply the configuration from a config_drive.  It
solved my problem, and it avoids all of the DHCP/cloud-init complexity
without needing direct injection.  Still very much a version 1 though:
https://review.openstack.org/#change,4498