A TCP/IP connection is the IP address and port number pair that identifies a particular service or connection point in a network. Each Message Dispatcher or RDS executing in a network requires a unique connection. To maintain the uniqueness, MDs and RDSs running on the same system must use different port numbers. MDs or RDSs running on different systems can use the same port numbers because the IP address makes the connection unique.
When using short form names, select unique names for the MD and the RDS. These names become aliases for the same IP address or host, and require assigning distinct port numbers in the SERVICES file. This extra network administration activity discourages using the short form name.
When using extended form names, you only modify the SERVICES file when you use service names. There are no network configuration requirements when you use port numbers. The HOSTS file or DNS only require updating when adding a new system to the network. The DNS update is part of the system installation activity. The name or an alias that is assigned to the system is the <host name> portion of the extended form of the MD or RDS name.
Configuring the connections for multiple encyclopedias requires specifying a connection for each encyclopedia, MD, or RDS in the network. When using short form names, that means adding a hostname and service name alias for each connection. When using the extended form name, only new port number or service name assignments are needed when the connections are on the same system.
For Windows, the HOSTS and SERVICES files are in the %windir%\system32\drivers\etc directory.
For UNIX, the hosts and services files are in the /etc directory. A system administrator usually makes these changes.
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