I think this document may help.

http://www.oclc.org/support/documentation/ezproxy/cfg/autologinip/

if you know the range of IPs your VPN assigns the above may work for you.

ernesto

-----Original Message-----
From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Joselito Dela Cruz
Sent: Thursday, October 18, 2012 1:47 PM
To: [log in to unmask]
Subject: [CODE4LIB] VPN & EZ Proxy

Hi All,

We use EZ Proxy for authentication and we always tell the staff who uses
VPN to turn their VPN off so they can access our databases. 
Is this the right way? Looking for answers around and could not find
any. I thought I would throw this in here.
Thanks for feedbacks.

Jay Dela Cruz