Schneider Electric Processor Adapter - Manual (Page 146)

Using the Ethernet Port
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Security
Overview To restrict access to your Ethernet controller and I/O network, you may want to
consider a firewall. A firewall is a gateway that controls access to your network.
Types of
Firewalls There are two types of firewalls:
l Network-level firewalls
l Application-level firewalls
Network-Level
Firewalls Network-level firewalls are frequently installed between the Internet and a single
point of entry to an internal, protected network.
Application-
Level Firewalls An application-level firewall acts on behalf of an application. It intercepts all traffic
destined for that application and decides whether to forward that traffic to the
application. Application-level firewalls reside on individual host computers.