This blogpost is the sixth in a series of seven, inspired by the most frequently asked questions we receive regarding PROFINET.
That fact that most PROFINET traffic is not routable is an inherent security measure. For a nefarious actor to manipulate PROFINET traffic, they would need to do so from inside your network. If a hacker is already in your network, then you likely have bigger problems to worry about. PROFINET Security Classes are in place to deal with aspects of authenticity, integrity, and confidentiality. End users can choose the level of security appropriate for their installation. In general, network security should be approached holistically with a defense-in-depth strategy.
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