9-6

DHCP Client Configuration

Ethernet encapsulation

Default TCP TTL

TCP keep-alive interval

TCP keep-alive data size

The following documentation, adapted from manual pages provided by the Internet Software Consortium, gives the format of allowed DHCP options which may be specified in the configuration file.

9.4.1 Option statements

DHCP option statements always start with the option keyword, followed by an option name, followed by option data. The option names and data formats are described below. It is not necessary to exhaustively specify all DHCP options - only those options which are needed by clients must be specified. Option data comes in a variety of formats, as follows:

The ip-addressdata type can be entered either as an explicit IP address (e.g., 239.254.197.10) or as a domain name (e.g. haagen.isc.org). When entering a domain name, be sure that that domain name resolves to a single IP address.

The int32 data type specifies a signed 32-bit integer. The uint32 data type specifies an unsigned 32-bit integer. The int16 and uint16 data types specify signed and unsigned 16-bit integers. The int8 and uint8 data types specify signed and unsigned 8-bit integers. Unsigned 8-bit integers are also sometimes referred to as octets.

The string data type specifies an NVT ASCII string, which must be enclosed in double quotes –for example, to specify a domain-name option, the syntax would be

option domain-name "isc.org";

The flag data type specifies a Boolean value. Booleans may take the value 1 (true) or 0 (false).

The data-stringdata type specifies either an NVT ASCII string enclosed in double quotes, or a

series of octets specified in hexadecimal, separated by colons. For example:

option client-identifier "CLIENT-FOO";

option client-identifier 43:4c:49:45:54:2d:46:4f:4f;

The documentation for the various options mentioned below is taken from the latest IETF draft document on DHCP options. Options which are not listed by name may be defined by the name option-nnn, where nnn is the decimal number of the option code. These options may be followed either by a string, enclosed in quotes, or by a series of octets, expressed as

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IBM Heritage user manual Option domain-name isc.org
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Heritage specifications

IBM, or International Business Machines Corporation, is a global leader in technology and consulting, with a heritage that spans over a century. Established in 1911, IBM initially emerged from a merger of four companies, and it has since evolved into one of the most influential players in the tech industry.

One of the main features of IBM’s legacy is its commitment to innovation. The company has a long history of technological breakthroughs, including the development of the first programmable computer, the IBM 701, in the early 1950s. IBM has also been at the forefront of many pivotal technologies, including mainframe computers, which became central to large-scale enterprise computing. The System/360, introduced in 1964, revolutionized the industry by offering a compatible range of computers that could run the same software, a concept that helped define the standardization of computer systems.

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Another key characteristic of IBM is its focus on research and development. With an impressive portfolio of patents, IBM consistently ranks among the top patent holders annually. Their research endeavors have led to significant advancements in quantum computing, with initiatives like the IBM Quantum Experience making quantum technologies accessible to developers and researchers.

Sustainability is also a priority for IBM, with programs aimed at promoting environmental responsibility. The company has committed to achieving net-zero greenhouse gas emissions by 2030, reflecting the growing importance of sustainability in technology practices.

In summary, IBM's heritage is characterized by a strong legacy of innovation, technological leadership, and a commitment to addressing contemporary challenges in business and society. From pioneering mainframe systems to leading the charge in AI and quantum computing, IBM continues to shape the future of technology while maintaining a visionary outlook towards a sustainable and inclusive digital world.
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