In the European Union, net neutrality regulations has been in place since 2016. However, a group of 45 advocate organizations, companies and individuals expressed its concern about the risk to net neutrality through the use of deep packet inspection (DPI) by Internet service providers (ISPs). According to the letter sent to EU officials, the BEREC Guidelines state that traffic management based on the monitoring of domain names and URLs is not 'reasonable traffic management' under the regulation, but this rule has been ignored by ISPs in their treatment of traffic and some of them are using DPI for differentiated pricing, prioritisation or throttling. This letter was written in the context of the evaluation of Regulation (EU) 2015/2120 and the net neutrality regulation and the guidelines.