Wan Connections Explained - Digi PortServer II User Manual

WAN Connections Explained

Each user can connect via PortServer II to other networks or to the Internet, in
addition to the local Ethernet host(s). For each user, you must define a WAN (Wide
Area Network) connection that specifies parameters such as the protocol to use. This
information is stored by PortServer II in the WAN Connection Table, where it is
referenced by a unique index number. This index number (less 1) provides an IP
address for the WAN interface. WAN connections can use PPP (Point to Point
Protocol), SLIP (Serial Line Interface Protocol), or CSLIP (Compressed Serial Line
Interface Protocol).
You entered the initial WAN configuration when you defined the user, as described in
Chapter 4, Basic Configuration. Use the procedures in this chapter if you want to
change the WAN configuration for a user.
Each connection may be incoming, outgoing, or both (bidirectional). For each
connection, you must configure incoming connection parameters and outgoing
connection parameters; some parameters are shared between the incoming and
outgoing connections.
Any WAN connection requires:
• A User Table entry. This must include the user name, the network addresses and
protocol information used to set up the connection, timeouts, and filters (if any) to
use. This information may be obtained from PortServer II's internal tables or from
a RADIUS server.
• Filters Table entry(ies) (optional), if you are using filters to restrict incoming
access by the user.
• Service Table entry(ies), to describe any service names you are using in the
filters. Actual service names are not required – a filter can be created by port
numbers, rather than service names, but service names make a filter more
readable.
Incoming connections also require the following:
• A Port configured to receive the incoming connection. You configure a port with
appropriate set commands, including set
flow, as described later in this chapter.
Outgoing connections also require the following:
• A Port configured to originate the outgoing connection. You configure a port
with appropriate set commands, including set ports, set line , and set
flow, as described later in this chapter.
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