[...]
> Why is the default "false"?
> 
> If you enable a service that's externally available,
> should you not
> advertise it?

Maybe, if there's a way to enable/disable advertising globally,
as well as the per-interface control you ask about below; and
perhaps an extra installer option to control at least the global
state.  Some installations will want to be maximally flexible
(esp. mobile, many desktops, or those that directly serve them);
others might want to volunteer zero information, or support for clients or
use for themselves zero autoconfiguration, or both.  Both positions may have
practical reasons behind them; doing the right thing for both extremes should
be possible while requiring the minimum possible setup.  Only if someone
wants finer-grained control should they need to know anything about the
details.

Sounds like there's an opportunity to coordinate with both installation
and NWAM on how to do this in such a way as to Do The Right Thing
as much as possible, while still providing consistent control of detailed
behavior when desired.

> How does one control on which interfaces one
> advertises?  Eg
> at home I run a machine with one nic that's Internet
> facing; the
> other nic handles local lan traffic.  I would happily
> advertise
> on the local nic; the external nic less so :-).
 
 
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