[Gllug] how to check for a transparent proxy

[Mark Lowes]

On Mon, 2002-12-02 at 15:45, itsbruce at uklinux.net wrote:
> On Mon, Dec 02, 2002 at 02:12:30PM +0000, Pete Ryland wrote:
> > > Ah.  You mean that the transparent proxy will, having diverted an ip
> > > packet on the way out and processed it, rewrite the source header of the
> > > ip packet to contain the original sender address before sending it out?
> > > And then watch for all replies to that ip address and re-divert them?
> > > Um, no.  Not on any set-up I'm familiar with.
> > 
> > Ok, indeed, this is possible.  In fact, it wouldn't be that hard to set up
> > come to think of it.
> 
> With iptables, yes, it should be possible.  But I've not come across it
> done that way.

Generally the whole point of implementing a transparent proxy is to
force all http traffic into a locally controlled cache so that maximum
aggregation of content as close to the requestor as possible is
achieved.

Particularly when dealing with cheap / free dialup accounts where
keeping the bandwidth costs at the border right down is essential.

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