Specifications

Chapter 3 Connecting on a LAN
Niagara Considerations
Niagara Release 2.3
Niagara Networking & Connectivity Guide Revised: May 22, 2002
3–3
Multiple sites In the scenario presented in Figure 3-2, ABC Company has added a JACE to a LAN
at another site. The sites connect to each other using a private data line leased from a
phone company, thereby creating an enterprise-wide WAN.
Interstation links are still used by all JACEs to update the GxPages on the Web
Supervisor. However, the network site administrator decided to move the Web
Supervisor onto the enterprise LAN at the primary site, since there was more data
traffic generated internally than the occasional external BUI use. The internal IP
address of the Web Supervisor changed to one in the IP range of the new network to
which it is attached, but the external address (courtesy of NAT) did not change.
Figure 3-2 Typical multi-site (WAN) architecture.
For additional information on engineering Niagara jobs, please see Chapter 1,
“Engineering Strategies” of the Niagara Web Solutions Guide.
Router
Browser User
Interface (BUI)
Internet
Firewall with
Proxy
and NAT
External IP Address:
204.253.56.14
Inside IP Address:
192.168.1.53
NAT Addresses :
204.253.56.x
ABC Company
Network: 192.168.1.x
Subnet Mask: 255.255.255.0
IP Address:
192.168.1.120
Subnet Mask:
255.255.255.0
IP Address:
192.168.1.125
Subnet Mask:
255.255.255.0
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Web Supervisor
Router
Router
JACE-5
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JACE-NP
Ethernet Hub
or Switch
Ethernet Hub
or Switch
BUI
Ethernet Hub
or Switch
BUI
Field Controllers Field Controllers
JACE-5
R
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Field Controllers
IP Address:
DHCP assigned
Subnet Mask:
255.255.255.0
IP Address:
192.168.2.98
Subnet Mask:
255.255.255.0
IP Address:
DHCP assigned
Subnet Mask:
255.255.255.0
Network: 192.168.2.x
Subnet Mask: 255.255.255.0