User Manual
Basic Remote Networking Managing Connections With Sites
4-2
The SCS cannot initiate connections to remote nodes. Remote nodes must call the SCS when they wish to
communicate with the network.
4.1.2 LAN to LAN
In LAN to LAN connections, the SCS provides a link between two networks. The SCS will communicate
with a remote router, which may be another access server, a UNIX machine capable of PPP routing, or
another SCS. The SCS may be connected to the remote router with temporary “dial on demand” connections
such as ordinary dialup modems. The SCS may also be permanently connected to the remote router with
leased lines, a statistical multiplexor, or a direct serial connection.
Figure 4-2: LAN to LAN Example
LAN to LAN connections are often used to connect two locations that do not always need to be connected.
For example, a small remote office with only a few nodes and a central office might need to be connected
occasionally, however, the amount of traffic wouldn’t warrant using a leased line for the connection. Using
an SCS and dialup modems, the connection would come up and go down when required, simulating a
permanent connection between the two locations.
4.2 Managing Connections With Sites
Every incoming and outgoing network connection is associated with a site. A site represents a remote
physical location, such as a remote router or a remote node. Sites are referenced by a name, such as seattle.
The site’s name should indicate the physical location of the remote device, a group of remote node users,
or a particular remote node user.
Note: Using sites for connections enables each connection to have different
characteristics; connections aren’t limited solely to the characteristics of the
ports used.
Sites serve four purposes:
1 To configure the SCS and the remote router appropriately for a connection. For example, particular
SCS ports may be assigned for use with the connection.
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