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On Aug 2, 2012, at 7:35 AM, Lars Kellogg-Stedman <lars at seas.harvard.edu> wrote:

> 
> With a multi_host, flatDHCP model, is the general idea that fixed_ips
> are -- generally -- internal to the compute host, and all external
> access is supposed to be via floating ips?  That's sort of how it
> looks, but I hadn't seen that states explicitly anywhere.

It isn't explicitly that way, but it is the easiest setup. It is possible to set up fixed ips that are accessible/routable from outside but there are a lot of gotchas
> 
> How does fixed_range interact with networks created via 'nova-manage
> network create ...'?  There are a few bugs (e.g.,
> https://bugs.launchpad.net/nova/+bug/741626) that suggest things need
> to be specified in both places.   Is that correct?

The snatting rule is created exclusively from fixed_range, so right now fixed_range must contain all created fixed networks.