The consolidation of networks onto IP also comes with risks, especially when it comes to security. The flat IP networks that will connect everything will offer many opportunities for threat actors to exploit the underlying IP connectivity for their own nefarious purposes. Despite the significant costs associated with securing the operation of networks, state regulators and standards bodies will increasingly insist on compliance with new and evolving security regulations and standards. Security for this expanding network infrastructure is a wide-ranging topic. This application note explains how the Nokia IPsec Security Gateway can be used to protect anyhaul networks for 3GPP mobile technologies, with a focus on addressing the changes that 5G brings