Rockwell Automation Ethernet Design Considerations Reference Manual - Manual (Page 38)

38 Rockwell Automation Publication ENET-RM002C-EN-P - May 2013
Chapter 3 Ethernet Infrastructure Features
Network Address Translation Network address translation (NAT) enables a single device to act as an agent
between the public network (commonly the plant network) and the private
network (machine network). This facilitates communication between a group of
computers with preset IP addresses on a private network by mapping each preset
IP address to a valid IP address on the public network.
These are two types of NAT implementations:
• One-to-many—Multiple nodes are mapped to a single public identity to
get onto the Internet, such as in a home network. This type of
implementation conserves public IP addresses and offers some protection
against attacks from the Internet.
• One-to-one—Each node on the network translates to another identity on
another network. This type of implementation is used in manufacturing to
integrate machinery onto a larger network without requiring addressing
changes at the machine level.
Allen-Bradley Products That Support NAT
The table summarizes features of the two products that support one-to-one NAT.
Feature 9300-ENA Device Stratix 5700 Switch
NAT architecture Standalone device Integrated into switch hardware
Performance 500 messages/s Wire-speed translations
Number of translations, max 128 128 devices or subnets (1)
(1) One subnet translation can include translations for 16…65,000 devices.
Supported network topologies Star • Star
• Redundant star
• Ring
Configuration Web interface • Device Manager Web interface
• Studio 5000 environment
• Command-line interface (CLI)