[arch-general] Can a ISP modify incoming http traffic to display ads using transparent proxy server ?

[Jude DaShiell]

I suggest you install addblocker in the firefox add-ons. On Sat, 2 Apr 
2011, Jan de Groot wrote:

> On Sat, 2011-04-02 at 12:15 +0530, Partha Chowdhury wrote:
> > My ISP is running a transparent proxy server on port 80 as I found out 
> > from this thread
> > 
> > http://mailman.archlinux.org/pipermail/arch-general/2011-March/019172.html
> > 
> > Now from last two or three days, I keep getting pop-up ads from a 
> > particular domain on every website i go to - even on text only websites 
> > ! If i choose another proxy server in firefox , then that does not 
> > appear on any site. But i normally connect to internet, that specific 
> > pop-up to a very particular website appears on every single page. If I 
> > install adblock plus in firefox, then of course no ads are displayed.
> > 
> > So is it possible that my ISP is serving that ad by intercepting 
> > incoming http traffic ?
> 
> Yes, proxyservers can intercept pages and modify them. I used to have a
> transparent squid proxy that would filter ads and replace them with a
> 1x1px transparent pixel.
> If you're paying for this internet line, I would suggest to switch to a
> different provider. Inserting ads in HTTP pages for a connection that is
> being payed for is not-done.
> 
>