  The COVID-19 pandemic led to the adoption of severe measures to counteract
the spread of the infection. Social distancing and lockdown measures modifies
people's habits, while the Internet gains a major role to support remote
working, e-teaching, online collaboration, gaming, video streaming, etc. All
these sudden changes put unprecedented stress on the network. In this paper we
analyze the impact of the lockdown enforcement on the Politecnico di Torino
campus network. Right after the school shutdown on the 25th of February, PoliTO
deployed its own in-house solution for virtual teaching. Ever since, the
university provides about 600 virtual classes daily, serving more than 16,000
students per day. Here, we report a picture of how the pandemic changed
PoliTO's network traffic. We first focus on the usage of remote working and
collaborative platforms. Given the peculiarity of PoliTO in-house online
teaching solution, we drill down on it, characterizing both the audience and
the network footprint. Overall, we present a snapshot of the abrupt changes on
campus traffic and learning due to COVID-19, and testify how the Internet has
proved robust to successfully cope with challenges and maintain the university
operations.
