Networking Concepts

Address Resolution

Network Directory

The network directory is a set of files that contain information used by the node to communicate with other nodes in the internetwork.

You use NMMGR to perform the following network directory functions:

•Add, modify, and delete entries in the directory.

•Review and inspect directory information.

•Merge a remote directory with a directory on the local node.

•Automatically update directories on a group of remote nodes by using a background stream job controlled from a central administrative node.

See Chapter 11 , “Configuring the Network Directory,” for more information on configuring the network directory through NMMGR. More information on merging directories and on central administrative nodes is included in this chapter.

When a Network Directory is Required

A network directory must be configured in the following circumstances:

•nodes running on X.25

•nodes not using domain name services

•nodes on a LAN network that do not support the HP-PROBE protocol

The network directory of a node in a Point-to-Point network must contain the IP addresses of all other nodes that you want the node to be able to reach.

When configuring the network directory for a Point-to-Point network, make sure that the IP address you enter in the network directory matches the data in the mapping screens (path name NETXPORT.NI.NIname.MAPPING.mapentry).

For nodes on an X.25 network, the network directory maps the X.25 address key to an IP address to allow a node to communicate within the X.25 network. You must configure a network directory for nodes using X.25.

Planning the Network Directory

There are two theories about how network directories should be planned and configured on a network, as follows:

•Centralized network directories.

•Decentralized network directories.

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HP E3000 MPE/IX, E3000/IX manual When a Network Directory is Required, Planning the Network Directory
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E3000 MPE/IX, E3000/IX specifications

The HP E3000 series, particularly the E3000/IX and E3000 MPE/IX, represents a significant milestone in the evolution of business computing, developed by Hewlett-Packard (HP) during the late 1970s and early 1980s. These systems were designed to provide robust, reliable, and efficient operation for mid-sized businesses, leveraging the power of the MPE (Multi-Programming Executive) operating system.

One of the main features of the HP E3000 series is its multitasking capability. MPE/IX allows for multiple applications to run concurrently, maximizing the utilization of system resources. This is particularly beneficial for organizations that require simultaneous access to various business applications, ensuring enhanced productivity and efficiency.

The HP E3000/IX architecture is built on a powerful 16-bit or 32-bit microprocessor, enabling it to handle substantial workloads. The system architecture is known for its modular design, which allows for easy upgrades and customization. This flexibility is essential for businesses that need to adapt to changing demands without overhauling their entire computing infrastructure.

Another notable technology incorporated into the HP E3000 series is its support for a range of storage solutions. The E3000 systems were compatible with various disk drives, providing organizations with options for data storage that matched their performance and capacity requirements. Additionally, they featured advanced data management capabilities, such as built-in backup and recovery systems, ensuring that critical business information remained secure and accessible.

Beyond hardware capabilities, HP E3000/IX and MPE/IX systems provide extensive programming support. They included tools for developing custom applications, with support for languages such as COBOL, BASIC, and FORTRAN. This versatility made it easier for businesses to tailor their software solutions to their specific needs, enhancing operational effectiveness.

Networking capabilities were also a significant innovation of the E3000 series. The systems offered robust support for various networking protocols, allowing for seamless integration with other computing environments. This facilitated communication and collaboration within an organization, as well as with external partners and clients.

In summary, the HP E3000/IX and E3000 MPE/IX systems were pivotal in delivering reliable computing power to mid-sized enterprises. With their multitasking operating system, modular architecture, advanced data management, and programming support, these systems provided an adaptable and comprehensive solution for evolving business needs. The legacy of the E3000 series is evident in how it paved the way for modern enterprise computing, focusing on flexibility, scalability, and efficiency.
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