[squid-users] Proxy chainning question

[Mihai Tanasescu <skyraven@xxxxxxxxxxxx>]

Hello,

I've just recently setup a transparent proxy (for http port 80) for my 
small network and I noticed some users were trying to use proxies found 
on the Internet  which also functioned on port 80.

Is there any way to prevent this kind of  proxy chainning to happen 
through my transparent proxy ?