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Page 112 - Internet Access 
Appendix A: General Information 
Data Routing 
Two examples of data services are shown in the figure below. 
In the first example, to specify a destination for data sent back from the Internet, it 
is only necessary to define a Service for the outgoing call and its associated IP 
routing. In this case, the IP Address specified in the Service profile is the 
destination. Hence the IP routing is set up by simply selecting the Service as the 
destination. 
Data Routing 
Welwyn - IP Address 192.168.42.1
Edinburgh - IP Address 192.168.131.1
Call Direction
RAS [Name = Edinburgh]
User [Name = Welwyn]
Service [Name = Edinburgh, Account
Name = Welwyn]
IP Route [Destination = Edinburgh]
Call Direction
Service [Name = Welwyn, Account
Name = Edinburgh]
IP Route [Destination = Welwyn]
RAS [Name = Welwyn]
User [Name = Edinburgh]
Connecting to the Internet
Connecting Two Locations
Call Direction
ISP RAS
Service [Name = BTClick]
IP Routing [Destination = BT Click]
 
In the second example, two different locations are to be provided with dialled 
access to each other. Both must have a RAS (to permit dialling in) and a Service 
(to permit dialling out) together with their associated IP routing. In addition, a user 
profile must exist at each end, set up for dial-in access, and containing the 
password to be sent to the RAS from the other end. The RAS then compares the 
password it receives in the incoming call with the one in the local user profile. The 
User Name at the RAS end must be the same as the Account Name specified for 
the calling service. 
The IP route for the service is set up to direct all data traffic addressed to the 
distant end to the appropriate Service for onward transmission. That is, at 
Edinburgh, any packets for the Welwyn IP Address are routed to the Welwyn 
service. 
Page 112 - Appendix A: General Information 
INDeX IPNC Cassette Administration Manual 
Internet Access 
38DHB0002UKDD – Issue 7 (22/11/02)