[Beretta_Vexee]

This page is over ten years old. Back then, it was relatively easy to use ARP spoofing on the local network, identify your workstation as the gateway to the Internet and does MitM.

One of the slightly more subtle tricks that took a long time for people to identify was to modify ad banners so that they pointed to another provideur. Servers were fixed, image sizes were standardised, etc. This also required much less computing power and bandwidth.

There's a student residence that displayed a lot of ads for Bible studies and gay porn about fifteen years ago.

This wouldn't work nowadays if the majority of traffic was encrypted using TLS and authenticated using certificates.