[pptp-server] VPN and squid

[Yoss]

Hi.
I made a small VPN network. Everything works fine, almost. 
I have transparent proxy on squid. It's acls limits access to my 
customers (exactly: to my IPs). 
But all of my VPN customers have "Access denied" - and in the squid's 
log I can see their REAL ip (not, the remoteip from pptp.conf). What is going
on? Why squid can see their real ip? 
Many of my customers have dynamic ip, so I can't add them to acls. I 
don't want to make open proxy. What can I do?

Thank you in advance

-- 
Bartłomiej Butyn aka Yoss
Nie ma tego złego co by na gorsze nie wyszło.