As I was looking for a way to review VPN usage I found this:
http://www.tummy.com/Community/software/radiuscontext/Download, unpack in /usr/local/radiuscontext, make a couple of symlinks, added a cronjob and it all works!
If anyone is interested in a copy/paste example, please let me know.
--edit HowTo--
mkdir -p /root/rr
cd /root/rr
wget
ftp://ftp.tummy.com/pub/tummy/radiusContext/radiusContext-1.93.tar.gztar -xzf ./radiusContext-1.93.tar.gz
mv radiusContext-1.93 /usr/local/radiusContext
cd /usr/local/radiusContext
mkdir -p /home/e-smith/files/ibays/Primary/html/VPN-Report
chown www:shared /home/e-smith/files/ibays/Primary/html/VPN-Report
ln -s /home/e-smith/files/ibays/Primary/html/VPN-Report VPN-Report
ln -s /var/log/radius/accounting.log accounting.log
# Create daily Cron-job
echo \#\!/bin/sh >> /etc/cron.daily/radiusreport
echo cd /usr/local/radiusContext >> /etc/cron.daily/radiusreport
echo ./raddetail accounting.log >> /etc/cron.daily/radiusreport
echo ./stdreport --reportdir VPN-Report >> /etc/cron.daily/radiusreport
# Run once
. /etc/cron.daily/radiusreport
Now check
http://smeserver/VPN-Report/ 
--edit HowTo--
Comments appriciated.