Specifications

Chapter 5 Connecting to an ISP
Niagara Considerations
Niagara Release 2.3
Niagara Networking & Connectivity Guide Revised: May 22, 2002
5–3
Figure 5-1 Typical ISP connectivity scenarios (sites 5 and 6).
Additional
Scenarios
Figure 5-2 shows some additional ISP-connectivity scenarios. Each option is
discussed in the following section.
Note These scenarios have not been tested by Systems Engineering. We recommend that
you set up a pilot to test them before implementing in a live job.
Connecting Windows-based Hosts via Telephone Modem
In options 1 and 2, two Windows-based Niagara hosts have been configured to
connect to ISPs with modems. They connect using RAS and each receive public,
static IP addresses (and other settings) from the ISP. However, RAS will not
automatically redial on disconnect. That function must be provided by a third-party
software application (such as RascalPro by Basta Computing).
If the ISP assigns dynamic IP addresses, an Internet DDNS provider (TZO or other)
must provide Windows-based client software to implement DDNS on these hosts.
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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Router
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JACE-NP
Ethernet Hub or Switch
Ethernet Hub or Switch
BUI
Ethernet Hub or Switch
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 2
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
Current IP Address from ISP:
209.98.231.53
Subnet Mask:
255.255.255.0
Name mapped to current
IP address of JACE:
JACE54.EasyIP.net
JACE-5
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ISP 2
Site 6
TZO.COM
Name mapped to current IP
address of JACE:
JACE54.EasyIP.net
Modem
JACE-4
Static IP Address from ISP:
162.38.94.99
Subnet Mask:
255.255.255.0
Default Gateway (at ISP):
162.38.94.1
DNS Servers (at ISP):
162.38.94.29
162.38.94.30
Site 5
ISP 1
*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.