Polymix-3 vs Polymix-4

Hi all,
I've been asked to write a brief report on the differences between
polymix-3 and polymix-4. The only addition on the feature lists is that
of DNS support and DNS addresses within experiment URLs.

Am I correct in thinking that this fairly short change list corresponds
to a significant amount of 'behind-the-scenes' work in implementing the
new addressing schemes, and the /22 subnet support?

Are there other areas in which polymix-4 is significantly better in
terms of realism, or accuracy of the content/request models it's using?

Kind Regards,

Bryn Reeves

--
Bryn M. Reeves
TCS Associate, Research & Development Team.
Avantis Limited, http://www.avantisworld.com/