User manual

Table Of Contents
Using the Ethernet Port
870 USE 101 00 V.3 135
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 which controls access to your network.
Types of
Firewalls
There are two types of firewalls:
Network-level firewalls
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.