Quickest and cheapest is a motorcycle-type bungee net that has hooks at corners and along the sides, but some of us have build gates. Check the Samba thread "Vanagon Dog Divider" featuring several solutions:

http://www.thesamba.com/vw/forum/viewtopic.php?t=386672&highlight=dog+gate

You did not clarify what the "rear" is.  Do you mean the wayback behind the rear seat, or just the area behind the front seats?  You might be able to adapt a child gate for the wayback.  Good luck!

Stephen

--- On Sat, 11/12/11, jon durham <jon_durham@KNOLOGY.NET> wrote:

From: jon durham <jon_durham@KNOLOGY.NET>
Subject: Barrier For Pets
To: vanagon@GERRY.VANAGON.COM
Date: Saturday, November 12, 2011, 11:57 AM

I'm looking for a web-type barrier to place between the rear and front
of my vanagon
--
“The greatness of a nation and its moral progress can be judged by the
way its animals are treated” --Gandi