Specifications

Chapter 4 Connecting with Direct Dial
Niagara Considerations
Niagara Release 2.3
Niagara Networking & Connectivity Guide Revised: May 22, 2002
4–3
Figure 4-2 shows another typical implementation of dial-up. A systems integrator
(SI) has configured a JACE-NP at Company ABC for dial-in. Choosing the
JACE-NP for dial-in allows the SI to maintain not only the JACE-NP, but the other
Niagara hosts on the LAN/WAN (sites 1 and 2). This is because Windows Remote
Access Service (RAS) on the JACE-NP has been configured to allow any host that
dials into it full access to its network. The SI chose not to dial into the Web
Supervisor (where dial-in was already configured) because the connection is
frequently busy with traffic from the remote JACE-4/5s.
There is one limitation with dialing into the NP, however. The JACEs in sites 3 and
4 are not maintainable through this connection by the remote SI. However, the
remote engineering station can dial directly into the JACE-4/5s to maintain them.
Figure 4-2 Support by remote administration.
About Dialing between Niagara Hosts
Any Niagara host can both dial another host and also be dialed into. As illustrated
above, the JACE-4/5s dial out to deliver alarms and archives. They also are dialed up
by the Web Supervisor and remote engineering station for maintenance. The Web
Supervisor is also dialed into and dials out. On the other hand, the remote engineering
Local IP Address:
209.252.1.27
Dial-in IP Address from
the JACE-NP:
192.168.1.123
Router
Browser User Interface (BUI)
Internet
Firewall with Proxy
and NAT
NAT Addresses: 204.253.56.x
ABC Company
Network: 192.168.1.x
Subnet Mask: 255.255.255.0
IP Address:
192.168.1.125
Subnet Mask:
255.255.255.0
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JACE-NP
Ethernet Hub or Switch
Ethernet Hub or Switch
BUI
Ethernet Hub or Switch
Field Controllers Field Controllers
Field Controllers
IP Address:
DHCP assigned
Subnet Mask:
255.255.255.0
IP Address:
192.168.2.98
Subnet Mask:
255.255.255.0
Network: 192.168.2.x
Subnet Mask: 255.255.255.0
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Web Supervisor
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Site 1
Site 3
Site 4
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Remote Engineering
Station
Modem
LAN IP Addresses
External IP Address:
204.253.56.14
Inside IP Address:
192.168.1.53
Dial-in IP Addresses
IP Address for
RAS Server:
192.168.1.183
IP Address for
Dial-in Client:s:
192.168.1.184
LAN IP Address:
192.168.3.5
Subnet Mask:
255.255.255.0
*Dial-in Addresses:
IP Address for RAS
Server (localAddr):
192.168.7.145
IP Address for Dial-in
Clients (remoteAddr):
192.168.7.146
LAN IP Address:
192.168.4.3
Subnet Mask:
255.255.255.0
*Dial-in Addresses:
IP Address for RAS
Server (localAddr):
192.168.7.145
IP Address for Dial-in
Clients (remoteAddr):
192.168.7.146
LAN IP Addresses
Local IP Address:
192.168.1.120
Subnet Mask:
255.255.255.0
*Dial-in IP Addresses
IP Address for
RAS Server:
192.168.1.122
IP Address for
Dial-in Clients:
192.168.1.123
*These dial-in addresses are used to create a temporary mini-network between the dial-up interface of the RAS
server and the dial-up interface of the client. For example, when the JACE dials the Web Supervisor, the WS
assigns the JACE the client address 192.168.1.184, and uses 192.168.1.183 for itself. Alternately, when the
WS dials the JACE, the JACE's RAS server allocates 192.168.7.146 to the WS, and uses 192.168.7.145 for
itself.