Keep interface MAC identity and current IP configuration in separate columns when reviewing a machine-network inventory.
Separate the address roles
Cisco’s ARP documentation distinguishes IP addressing from Ethernet MAC addressing and their local mapping. They identify different network-layer roles. Primary reference: IP and MAC address mapping.
Do not treat either address as a complete equipment serial identity or authentication proof. Configuration, multiple interfaces and replacement hardware can complicate a one-row inventory. Record the relevant interface rather than attaching an address indiscriminately to the entire machine.
A hypothetical changed-network record
Imagine the same recorded interface appears in a new network configuration with a different IP address. A worksheet that uses IP alone as the equipment identifier could incorrectly create a second machine record. Conversely, a controller replacement may require a new interface record even when the project reuses its earlier IP configuration.
Create separate columns for equipment ID, component identity, interface name, observed MAC, IP configuration, network context and observation date. These fictional cases distinguish an inventory update from a conclusion that communication or physical hardware is unchanged.
Make the evidence traceable
Ask the integration owner how the equipment record is linked to its current interfaces and where address observations originate. Preserve old and new associations when the layout or component changes. Do not assume a MAC is unchangeable or globally sufficient for device authentication.
This guide supplies no network-scanning or address-change procedure. It claims no Ethernet interface on HM equipment. The buyer’s useful output is a network inventory that separates current routing configuration from interface identification and from the independent equipment asset identity.
Customer Questions
Are MAC and IP interchangeable asset IDs?
They have different network roles.
Does a reused IP prove the same hardware?
Keep component and interface evidence.
Does a MAC prove authenticated identity?
Address observation alone is insufficient.
Primary References
These references support the technical principles discussed in this guide. The worked examples and review questions are educational.
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