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Exploring IP Address Assignment Methods: DHCP vs. Offline Approaches

This discussion summarizes the advantages and costs of two IP address assignment methods: DHCP and offline assignment. The use of DHCP with HLP provides benefits like IP address continuity but incurs costs such as additional signaling rounds, particularly in IPv6 environments. On the other hand, offline IP address assignment simplifies processes in crowded scenarios, reducing latency by locally assigning addresses. The choice of method should be based on application requirements, with devices selecting supported options through Beacon and Probe Response messages.

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Exploring IP Address Assignment Methods: DHCP vs. Offline Approaches

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  1. IP Address assignment: Offline discussion summary Authors: Date: 2013-03-18

  2. Summary: Include both options REASON: Proposals address different use-cases Use of DHCP using HLP Benefits: • IP address continuity • More general Cost: • Additional rounds of signaling before data transmission can begin [2 additional roundtrips: (i) for Duplicate Address detection for IPv6; (ii) for DNS MAC address discovery for local DNS] • Additional latency for IPv6: Duplicate Address detection requires that the all the existing/associated devices need to be given time to respond to the query sent out by the new incoming device. Deployment of “Optimistic DAD (RFC4429)” can reduce this latency • Association response may be delayed if DHCP server does not respond in time FILS IP Address assignment Benefits: • No additional signaling: helps in crowded situations, transit stations to reduce signaling storms • IP address locally assigned (by AP): Does not introduce additional latency to send Association Response message Cost • Minimized feature set (only limited options of DHCP are supported) • IP address continuity outside of an ESS not supported

  3. Which one to use? Which mechanism to use? Based on application requirement How to select the IP address assignment method? Beacon/Probe Response advertises which options are supported by the AP STA selects the appropriate option based on the AP support and the application requirement

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