7-20 Command Sets for Command Line Interface

1. arp

Syntax:

arp add <i/f> <IP address> <MAC address> arp delete <i/f> <IP address>

arp flush arp [list]

arp help [all<cmd>]

Description:

Allows display and manipulation of the ARP table: the list of IP addresses and corresponding MAC addresses obtained by ARP on Ethernet-like interfaces. Normally there is no need to add entries to the table with “arp add”, since they should be discovered by the ARP protocol. Displaying the table with “arp list” (or just “arp”) is sometimes useful, and deleting an entry with “arp delete”, or the whole table with “arp flush”, can sometimes speed up recovery from temporary problems if something unusual has happened. Entries added with “arp add” do not time out like those discovered by use of the ARP protocol, but they are deleted by “arp flush” and will not survive a restart (they are not saved by configuration saving). Note that the ARP table is used only for destinations on directly connected Ethernet-like networks, not for those reached through routers (although the ARP table may be used to discover the MAC address of the router).

Example:

DSL> ip arp add ether 192.168.50.1 8:0:20:19:9A:D9

DSL> ip arp

arp add flane 192.168.2.63 00:20:2b:e0:03:87 # 8m58s arp add flane 192.168.2.109 00:20:2b:03:08:b1 # 2m24s arp add ether 192.168.50.1 08:00:20:19:9a:d9 # forever arp add ether 192.168.50.57 00:20:af:2e:fa:3c # 3m25s DSL> ip arp delete flane 192.168.2.109

DSL> ip arp list

arp add flane 192.168.2.63 00:20:2b:e0:03:87 # 8m46s arp add ether 192.168.50.1 08:00:20:19:9a:d9 # forever arp add ether 192.168.50.57 00:20:af:2e:fa:3c # 3m13s

DSL> ip arp flush

DSL> ip arp

#flane ARP table is empty

#ether ARP table is empty DSL> ip arp

arp add flane 192.168.2.108 00:20:2b:03:0a:72 # 10m58s

#ether ARP table is empty

(The last example shows that the MAC address for 192.168.2.108 has

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IBM Heritage user manual Arp, DSL ip arp add ether 192.168.50.1 8020199AD9

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.