Ports For Outgoing Connections; Telephone Numbers; Authentication - Lantronix SCS Reference Manual

Basic Remote Networking

4.6.1 Ports for Outgoing Connections

Each site must specify which SCS ports may be used for outgoing connections. More than one port may be
specified; for example, site dallas might specify that port 2 or port 3 could be used for outgoing connections.
When the SCS attempts to make a connection to a site, it attempts to use one of the specified ports. If the
port is busy (in use with another connection), it attempts a connection using another specified port. The SCS
uses the port priority setting to determine which ports to try and in what order. In the following example,
site dallas will try port 2 first, then port 3.
Local>> DEFINE SITE dallas PORT 2 PRIORITY 1
Local>> DEFINE SITE dallas PORT 3 PRIORITY 2
If all ports are busy, the SCS will time out the site for a few minutes and then try again. The connection
timeout between call attempts is user configurable. See Define Site Time Failure on page 12-146.
More than one site may specify a particular port. For example, site dallas and site seattle may specify that
port 3 may be used for connections. If site dallas is using port 3 at a certain time and site seattle is started,
seattle will attempt a connection using another specified port. If no other port is specified for site seattle, it
will wait until port 3 becomes available.
To learn how incoming calls use ports and sites, see Starting PPP/Slip for
Note:
Incoming Connections on page 4-11.

4.6.2 Telephone Numbers

Each site may specify one port-independent telephone number and one or more port-specific telephone
numbers. A port-independent telephone number is typically used if all ports are configured to call the same
number; for example, if the ports are calling a telephone hunt group. Port-independent telephone numbers
should be used whenever possible; this frees a site to dial the remote site's number from any of the ports the
site is associated with.
Port-specific telephone numbers are used when a particular SCS port should call a specific number at the
remote site. These numbers will override a port-independent telephone number. For example, in order to get
the most efficient use out of connected modems, a site might specify that when port 2 (connected to a high
speed modem) is used, another high speed modem should be dialed. When port 3 (connected to a slow speed
modem) is used, the SCS should dial another slow speed modem.
If a site does not have a telephone number defined, the SCS assumes that either there's a direct connection
between the SCS and the remote host, or that a chat script (see Chapter 5, Additional Remote Networking)
will be used to communicate with the remote host.

4.6.3 Authentication

The remote site may require that the SCS authenticate itself by sending a username and password. The
username that the SCS sends is (by default) the site name. To send a different username, use the Define Site
Authentication Username command, described on page 12-132.
Figure 4-26: Port Priority for Sites
4-17
Outgoing Connections